User`s Manual IRAUDPS1_R3.3
Contents
1. IRAUDPS1 Block Diagram PUSH PULL on B Supply Current FUSES Rectifiers Sense amp filters Battery B terminal EMI gt SGnd inputs Filter o B cei ectifiers Chassis GND Current amp filters r ES ML IMEEM IR2085 Batt OVP I I SCP d Rem ON OFF Remote o and 12V ON OFF 9 Rem Regulator I l i A Thermistor B OVP Or D Thermally connected to heat spreader I t IR2085 Module Fig 1 Functional Block Diagram www irf com IRAUDPS1 Page 6 of 35 International TER Rectifier 0 01uF IR2085 S uf vec cs VBI 8 ak Header2 O open 2 OSC HO1 7 d NS Q Ww v2 J4 H 3 4 a es l la 2 3 GND VSI 6 m 142v 144v 5 1 220pE 130n8 470pF A e H N aos LOL 4 Lo vec 5 vcc f 3 E F J5 RI C2 470pF 2 0 0 5 2 4 PIO ie O 2 30k 50khz vec Q TumON RI VCCCP2 R30 R20 InF 15k 50kHz Ja pity 2 li x Header o 3 f 2 2R 10uF dn Ka a Ik De e BlUED2 14 4V 3 4 24 1 k 2 ie r gt 1 c J HT R26 AN gf li 247 1 N2. Table 2 Specification 250W 1000W IR Class D Load IRAUDAMP5 IRAUAMP8 x 2 Input current with no load 0 35A 10 0 35A 10 ACC Remote ON Level 4 5 6V 4 5 6V ACC input impedance 10k 10 10k 10 Turn ON delay 1 1 5 Sec 1 1 5 Sec In Rush Current 30A Max 30A Max Output power full loaded 250W 1000W Input current full loaded 18A 71A Output Current per supply 3 5A 14A Output voltage 35V 10 35V 10 Regulation 10 15 Ripple outputs laded at 1 5V P P 2V P P 400W audio 1khz Efficiency at Y and full of 90 85 90 80 rated power Isolation between Battery 1k Ohm 1k Ohm and Outputs Gnd Battery OVP 18 18 5V 18 18 5V Battery UVP 8 0 8 5V 8 0 8 5V Output SCP 10A 40A Outputs OVP 40 45V 40 45V Over temperature 90C 5C 90C 5C protection OTP OTP hysteresis 10C 10C 10C Led Indicators Red LED SCP Blue LED OK Size 3 Wx5 3 LX 1 5 H Table 3 B B Voltage outputs vs Battery voltage all models Voltage outputs at 16 0V battery input with 39 5V 10 no signal input at class D Voltage outputs at 12 0V 28V 10 Voltage outputs at 8 0V battery input with 19 2V 10 no signal input at class D www irf com IRAUDPS1 Page 4 of 35 International rom Rectifier Functional Block Description Fig 1 below shows the functional block diagram which basically is an isolated DC DC converter
3. Hex tool 1 4 or 6M 0 475 e Sclae 1 1 Hex Screws e PTA Material Aluminum 1 4 28 x 0 310 IT 3 E 0 400 or M6 1 0 x8mm E Di P E l s AA Dia Hole passed through All dimentions are in inches i A l HS Front Rear view 8 s Part ID Co ii 3 ok otek IR2085 Battery terminals 0 250 PA E O ig E Men Top holes are 1 4 28 threaded or 6M 1 0 Hole for cable 8 AWG gt f xe ec 2 E b i Bottom holes are 8 32 threads x 0 250 or 4M 7 ai E n n A l E l TEE Ex Finish Gold Flash or white chrome we LU IE E Ld including srew sets SZ y 0 475 k oz 0 475 k Bottom Phillips Screws 8 32 x 0 250 A tcs Tolerances 0 005 or M4 7 x 6 3mm Top view Side view Bottom view for mounting on PCB Fig 27 Input Battery Terminals IRAUDPS1 www irf com Page 24 of 35 Intern ational TOR Rectifier IRAUDPS 1 transformer winding instructions IR Assy P N IR TR500 2085 500W 25 REFERENCE DESIGN Schematic Materials required Surg p Start Core Magnetics material P zP42915TC P1 3 F 1 Finish 2 L Z Finish 0 750 Stat 35 io Start 2 P2 3 S2 k o 600 Finish Ls Finish Fig 28 _ Fig 29 Step No 1 Winding P1 Fig No 30 1 2 Cut 30cm length of 1 0mm gage x 4 wires of magnet wire AWG 18 Start winding P1 at 0 degrees forward
4. 25kHz 50 kHz 100kHz AWG Diameter DCR per 1ft Skin Rac Skin Rac Skin Rac mils mo depth Rdc depth Rdc depth ratio ratio ratio Rdc 12 81 6 1 59 4 56 1 45 6 43 1 85 9 10 2 55 14 64 7 2 52 3 61 1 30 5 09 1 54 7 21 2 00 16 51 3 4 02 2 87 1 10 4 04 1 25 4 54 1 40 18 40 7 6 39 2 27 1 05 3 20 1 15 4 54 1 40 20 32 3 10 1 1 80 1 00 2 54 1 05 36 1 25 22 25 6 16 2 1 48 1 00 2 02 1 00 2 85 1 10 24 20 3 25 7 1 13 1 00 1 60 1 00 2 26 1 04 26 16 1 41 0 0 90 1 00 1 27 1 00 1 79 1 00 Secondary Windings Because the secondary current is only 6 6A lets assume a power dissipation of 2W on the secondary windings Secondary DCR maximum rewired 2 6 6 0 045 ohms Thus 3 wires 20 required from table 9 MOSFTS Selection Because part of the customer specification has to be a compact design the Direct FET IRF6648 is selected due to small package high current capability 60Vps low RDSon and low Qg feature Quantity of MOSFETS required Since the input current at full load will be 57 amperes and operating frequency is 50 kHz with 5096 duty cycle 10us turn ON and according to IRF6648 data sheet the safe operating area Fig 12 from data sheet Therefore 15A will be the adequate current to be into the SOA Number of devices 57A 15A 3 8 devices Thus 4 devices required per each side of the Push Pull transformer IRAUDPS1 www irf com Page 30 of 35 International A REFERENCE DESIG
5. Fig 23 Direct FET thermal dissipation IRAUDPS1 www irf com Page 22 of 35 International REFERENCE DESIGN of 23 EI TER Rectifier J K 0 125 4 ee 0 125 O o im bd O O E Material Aluminum 0 125 Thick Sclae 1 1 All dimentions are in inches Part ID 3 IR2 85_ Aluminum Base All Holes are 0 125 pass through Tolerances 0 005 All corners are 0 100 Radious a o L 3 Top and bottom dimentios S o O C are symetricals J ae E z 7 d 2 2007 E Finish white or block chrome ad 1 009 5 5 300 Fig 24 Aluminum base 13 K ease K e25e O0 e pa lt 4 40 thread pass through AT le Vh i eser k Material Aluminum 0 250 Thick Sclae 1 1 All dimentions are in inches 2 Part ID o TE gt 8 a Jj 0 500 k IR2085_ Aluminum Bracket All Holes are 4 40 threads Tolerances 0 005 Finish white or black chrome RUNE pe lt 4 40 thread pass through al Fig 25 Heat Spreader for DirectFETs www irf com IRAUDPS1 Page 23 of 35 International p REFERENCE DESIGN T R Rectifier gt E e e8e Material THERMAL PAD 080 4X4 GAPPAD Bergquist P N 080 GP 1500 4 X4 Digikey P N BER164 ND 2 30 Sclae none All dimentions are in inches Part ID R2085 Thermal Pad Tolerances 0 01 0 500 k Fig 26 Thermal Pad
6. 2 0 1uF R2i 5 International s q E Remote ON rwol H 4 R9 2 1 IER Rectifier l WE 2 di Header 6H Hip A ud 2085 Control Module R3 e mail mrodrig5 Girf com Fig 2 schematic of IR2085 Module www irf com IRAUDPS1 Page 7 of 35 International TOR Rectifier REFERENCE DESIG IRAUDPS1 12V System SMPS 500W Converter with Direct Fets And IR2085 PWM Module Optior open MUR1620CTG 16 B aji 7 ve EIE 2 L1 CRI V_Rectified 2 scP swi 1 jscr EE Bane cee eal UT payami aoci 3 EOWA i D FED i D_FET6 EE FE A D_FETI4 a dig 2 m 2 op HH meses liek open IRF6648 Core Magnetics P N ZR42915TC PSP RE E if as P1 P24T 18x4 60uH DCR 3nOhns Header 2 LA AAA S1 52 10T 20134704H DCR 46nOhns m 10k tog ME soria y ics 2 LOIB 1 Ral a HA 2 4 s ad p p oT 2 g sw1 V_Rectified MMBTS401 V
7. 2W 2W 2 W 11 watts Total MOSFET losses RDSon losses Switching losses 6 09W 11 34W 17 43W Overall Losses 11W 17 43W 18 48W 46 91W Efficiency 600 600 46 91 92 74 Therefore meet the efficiency specification IRAUDPS1 www irf com Page 32 of 35 International REFERENCE DESIGN T R Rectifier Frequency of oscillation From Fig 2 the frequency of oscillation is managed by R1 and C2 values and it shall be calculated by the equation below Fosc 1 R1x C2 50 kHz Thus at 50Khz if R1 is 30k then C2 will be 470pF said values as shown on schematic Fig 2 See IR2085 data sheet for more details Selecting Dead time Dead time selection depends on the turn ON and OFF delay of the power MOSFETS selected in this case IRF6648 data sheet shows 16nS for turn ON delay and 28nS for turn OFF delay rise time 29nS and fall time 13nS Therefore dead time required 16nS 28nS 29nS 13nS 86nS per phase Because this is a push pull then 86nS are multiplied by two giving 172nS Thus dead time can be programmed according to the 2085 datasheet where dead time values are the relationship weight of C versus R Therefore Fig 2 30K ohms and 470pF gives 170nS of dead time Over Temperature Protection OTP Thermistor is selected to get 8 2 k ohms at 90 C it can be readjusted changing R16 or R15 and R17 for any other temperature Over Current Protection OCP From Fig3 R47 R48 R49 and R54 can be calculated
8. with a step up push pull transformer from a 12V system that converts it to 35V using the IR2085 as a PWM and gate driver along with the Direct FETS IRF6648 The IR2085 Module contains all the housekeeping circuitry to protect the IRAUDPS1 against streamer conditions which are 1 Soft start circuit in order to control the inrush current at the moment the IRAUDPS1 power is turned ON 2 Short Circuit protection at outputs SCP which will shut down the IR2085 and remain in latch mode until the Remote ON OFF switch is released 3 12V system Over Voltage protection OVP1 if Battery input voltage is greater than 18V this could happen when the vehicle s battery is disconnected or a vehicle s alternator fails 4 Over voltage Output OVP2 is greater than 45V at B terminal if battery input is greater than 16V 5 Over Temperature Protection OTP resistor Thermistor senses the chassis temperatures from Direct FETS Fig 2 is the complete schematic for the IR2085 Module Fig 3 is the complete schematic for the IRAUDPS1 with all scalable components required Figs 4 to Fig 10 are the respective PCB layouts for the IR2085 Module and the IRAUDPS1 motherboard Tables 4 to Table 6 are the respective bills of materials Table 7 is the IRAUDPS 1 detailed output power versions that can be configured by replacing components www irf com IRAUDPS1 Page 5 of 35 International T R Rectifier REFERENCE DESIGN Bis
9. 0V DEFERRI TS p M Power up 8 Turn ON the main source power supply the input current from the source power supply should be 0 0mA and all LEDS should be OFF 9 Look at LED2 on the IR2085 Module it should be OFF then turn ON the Remote OFF Test to Test switch while you observe LED2 it will light slightly after turning ON said switch then LED2 will come fully bright one second after the Remote switch was turned ON Test position 10 In the mean time the figure on the oscilloscope will start from narrow pulses up to 50 duty cycle and the oscillation frequency shall be 50kHz as shown on Fig 12 and Fig 13 below This is the soft start test IRAUDPS1 www irf com Page 16 of 35 International e REFERENCE DESIGN c ef TER Rectifier Tek EH Acq Complete M Pos 2420s TRIGGER Tek mE Tria d M Pos 215 0ns MEASURE Type CH2 Off Min Source ER nr Max 348V CHI Slope Min Rising 3 204 CH1 Pk Pk 37 6V CH1 Mode Normal E 1 Coupling Freq 50 73KH2 cHi 200 CH2 2 004 M500 s CH2 7 532V RUN TUN M SUUS CHE MN Ti Dec 08 0803 53 0203kHz AA Fig 12 waveform from 2085 module Fig 13 wavetorm from power transformer 11 The power consumption from the source power supply shall be 0 35A maximum typical is 0 30A and the B and B LEDs will turn ON as well 12 Measure the voltage on B and B it will be 35V 1 5V respectively This is the transformer s windings turns ratio and full w
10. Temperature Protection 33 24 Short circuit protection 33 20 BJT gate driver option 33 26 Music Load 34 25 Revision Changes Descriptions 35 www irf com IRAUDPS1 Page 2 of 35 International TER Rectifier Introduction The IRAUDPS reference design is a 12 volts systems Audio Power Supply for automotive applications designed to provide voltage rails B and B for Class D audio power amplifiers This reference design demonstrates how to use the IR2085 as PWM and gate driver for a Push Pull DC to DC converter along with IR s Direct FETS IRF6648 The resulting design uses a compact design with the Direct FETS and provides all the required protections Table 1 IRAUDPS1 scalable table IRAUDPS1 250W 1000W Nominal Voltage B B 35V 35V output Nominal Output B B 3 5A 14A Current Application Stereo System 8 channel System 100W x 2 100W x 8 IR Class D Model IRAUDAMP7D IRAUDAMP8 x 2 Detailed output power versions that can be configured by replacing components given in the component selection of Table 7 on page 14 www irf com IRAUDPS1 Page 3 of 35 International TER Rectifier E System Specification All specs and tests are based on a 14 4V battery voltage supplying an International Rectifier Class D reference design with all channels driven at 1 kHz and a resistive load
11. 3 Released January 23 2009 IRAUDPS1_R3 1 Reviewed March 24 2009 IRAUDPS1_R3 2 Tables 1 2 5 7 Revised for 500W April 22 2009 IRAUDPS1_R3 3 Page 30 50 khz with 50 duty cycle 10us Feb 21 2013 turn ON Page 30 number of devices 57A 15A Page 31 32 corrected gate drive current calculation Corrected power dissipation loss calculation numbers Corrected MOSFET switching loss calculation Corrected efficiency number according to new power losses data Page 33 corrected typo of dead time ns International I amp R Rectifier WORLD HEADQUARTERS 233 Kansas St El Segundo California 90245 Tel 310 252 7105 Data and specifications are subject to change without notice IRAUDPS1 www irf com Page 35 of 35
12. 4 SCRW 250 BR Stand off 0 250 1454AK ND Keystone Electronics 6 NUT HEX 4 40 STAINLESS STEEL Nut 4 40 H724 ND Building Fasteners 6 SCREW MACHINE PHILLIPS 4 40X3 4 Screw 4 40X3 4 H350 ND Building Fasteners 12 WASHER LOCK INTERNAL 4 SS Washer 4 SS H729 ND Building Fasteners Table 7 Scalable IRAUDPS1 by changing the following components Component Notes 250W IRAUDPS1 1000W Power Transformer T1 See winding instructions IR P N TR 2085 250W IR P N TR 2085 500W IR P N TR 2085 1000W Direct FETs Populate the respective Direct FET D FET6 D FET16 D FET6 D FETS8 D FET14 D FET6 D FETS8 D FET14 by IR6648 as shown on respective D FET16 D FET16 model D FET2 D FETA D FET10 D FET12 R47 R48 R47 R54 Short circuit sensitivity 0 06R 0 03R 0 015R Fuse F1 F2 F3 Input Current 5A 15A 25A D1 D2 D3 D4 Output Rectifiers 4A 8A 16A CP3 CP4 CP5 Input Filters 2200uF 25V 3300uF 25V 3900uF 25V www irf com IRAUDPS1 Page 14 of 35 International TER Rectifier IRAUPS1 Application and connections REFERENCE DESIGN BIER Oscilloscope HI Audio Generator 1Khz 9 0V 1V RMS L le jee ee m Class D Power Supply 10 18V 0 1A 100A 100W X4 Power Amplifier IRAUDAMP8 IRS2093 Fig 11 test Setup Resistive Loads www irf com IRAUDPS1 Page 15 of 35 International m REFERENCE DESIGN T R Rectifier Connector Description Battery TB1 Terminal Board for N
13. 6A 200V TO220 CR1 MUR1620CTGOS ND ON Semiconductor 1 open DIODE Comm Anode ULT FAST 16A 200V TO220 CR2 MUR1620CTRGOS ND ON Semiconductor 4 STTH1002CB DIODE FAST 200V 10A D PAK D1 D2 D3 D4 497 3536 5 ND STMicroelectronics 4 open Direct FET MOSFET N CH 60V 86A FET2 FET4 FET10 FET12 IRF6648TR1PBFCT ND International Rectifier 4 IRF6648 Direct FET MOSFET N CH 60V 86A FET6 FET8 FET14 FET16 IRF6648TR1PBFCT ND International Rectifier 3 Fuse Holder FUSEHOLDR MINI VERT PCB MNT SNGL F1 F2 F3 F065 ND Littelfuse Inc 2 FERRITE QUAD LINE 10A FERRITE 3 LINE 10A 342 OHMS FB1 FB2 240 2494 ND Stwart 3 15A FUSE BLADE 15A 32V MINI FAST ACT Fuse1 Fuse2 Fuse3 F992 ND Littelfuse Inc 1 Module_2085_R2 Control Module J1 J2 J3 J4 J5 J6 Custom IR Module 2085 R2 PCB 2 3 3uH 10A INDUCTOR POWER 3 31UH 11 4A T H L1 L2 513 1522 ND Coiltronics 1 Blue LED 468NM BLUE CLEAR 0805 SMD LED1 160 1645 1 ND Lite On Inc 1 Blue LED 468NM BLUE CLEAR 0805 SMD LED2 160 1645 1 ND Lite On Inc 1 MMBT5401 TRANSISTOR PNP 150V SOT 23 Q1 MMBT5401FSCT ND Fairchild Semiconductor 1 MMBT5551 TRANSISTOR NPN 160V SOT 23 Q2 MMBT5551FSCT ND Fairchild Semiconductor 4 2 2K RES 2 2K OHM 1 8W 5 0805 SMD R14 R16 R31 R32 RHM2 2KARCT ND Rohm 1 100R RES 100 OHM 1 4W 5 1206 SMD R43 311 100ERCT ND Yageo 1 10 RES 10 OHM 1 4W 5 1206 SMD R44 RHM10ERCT ND Rohm 1 1k RES 1 0K OHM 1 4W 5 1206 SMD R45 RHM1 0KERCT ND Rohm 4 0 03R RES 03 OHM 1W 1 2512 SMD R47 R48 R49 R54 WSLG 03CT ND Vishay Dale 4 10k
14. C3 311 1069 1 ND Yageo 3 0 1uF CAP CERM 10UF 50V 20 0805 SMD C6 C7 C8 478 3351 1 ND AVX Corporation 2 10uF CAP TANTALUM 10UF 16V 10 SMD CP1 CP2 495 2236 1 ND Kemet 7 1N4148WT 7 DIODE SWITCH 100V 150MW SOD 523 D1 D2 D3 D4 D5 D6 D7 1N4148WTDICT ND Diodes Inc 1 18V SOD123 Z DZ1 MMSZ5248BS FDICT ND Diodes Inc 1 5 6V DIODE ZENER 5 6V 200MW SOD 323 DZ2 UDZSTE 175 6BCT ND Rohm 1 12V DIODE ZENER 200MW 12V SOD323 DZ3 BZT52C12S TPMSCT ND Micro Commercia 1 10V DIODE ZENER 10V 200MW SOD 323 DZ4 MMSZ5240BSDICT ND Diodes Inc 1 Header Header 6 Pin Right Angle J1 J2 J3 J4 J5 J6 929500E 01 01 ND 3M 1 Red LED RED ORAN CLEAR THIN 0805 SMD LED1 160 1422 1 ND Lite On Inc 1 Blue LED 468NM BLUE CLEAR 0805 SMD LED2 160 1645 1 ND Lite On Inc 2 XN04311 TRANS ARRAY PNP NPN W RES MINI6P Q1 Q7 XN0431100LCT ND Panasonic SSG 1 PBSS305NX TRANS NPN 80V 4 6A SOT 89 Q2 568 4177 1 ND NXP 2 open OPEN TRANS NPN 80V 4 6A SOT 89 Q3 Q4 568 4177 1 ND NXP 2 open OPEN TRANS PNP 80V 4A SOT 89 Q5 Q6 568 4178 1 ND NXP 1 30K RES 30K OHM 1 10W 5 0603 SMD R1 RHM30KGCT ND Rohm 1 1k RES 1K OHM 1 10W 5 0603 SMD R2 RHM1 0KGCT ND Rohm R3 R6 R9 R14 R15 R16 R17 R23 R24 11 10k RES 10K OHM 1 10W 5 0603 SMD R32 R33 RHM10KGCT ND Rohm 1 1Meg RES 1 0M OHM 1 10W 5 0603 SMD R4 311 1 0MGRCT ND Yageo 4 4 7k RES 4 7K OHM 1 10W 5 0603 SMD R8 R13 R22 R25 RHM4 7KGCT ND Rohm 1 470k RES 470K OHM 1 10W 5 0603 SMD R10 RHM470KGCT ND Rohm 1 2 2 RES 2 2 OHM 1 4W 1 1206 SMD R11 P2 2RCT ND
15. IGN T R Rectifier B B vs Battery voltage outputs B and B Voltage outputs Nm al Battery voltage Fig 20 IRAUDPS1 www irf com Page 21 of 35 International m REFERENCE DESIGN I amp R Rectifier IRAUDPS 1 Fabrication Drawings Mechanical assembly HEX NUT 4 40 P N H216 ND HEX NUT 4 40 P N H216 ND x 6 Lock washer L Lock washer L P N 1454AK ND gt oy lt POB 5 Stand off 0 250 Lock washer 7 an P N 1454AK ND x 4 i co l i Stand off E 0 250 Lock washer z lt H729 ND x 12 Screw H350 ND x 6 Aluminum Bracket E Lock washer n Aluminum Base Lock washer Screw H350 ND lt Lock washer EXP Lock washer Screw H350 ND Fig 22 Mechanical assembly DirectFETS versu Aluminum Brtacket and Thermal Pad Assebly DirectFETS Gap 0 032 0 062 0 030 Lock washer gt cx Lock washer x PCB Heat Spreader Bar l i Alumimum plate Base ta Lock washer E Lock washer Pad insulator THERMAL PAD 080 4X4 GAPPAD Bergquist P N 080 GP 1500 4 X4 Digikey P N BER164 ND
16. International ron Recifir IRAUDPS1 12V System Scalable 250W to1000W Audio Power Supply For Class D Audio Power Amplifiers Using the IR2085 self oscillating gate driver And Direct FETS IRF6648 By Manuel Rodriguez CAUTION International Rectifier suggests the following guidelines for safe operation and handling of IRAUDPS1 Demo Board e Always wear safety glasses whenever operating Demo Board e Avoid personal contact with exposed metal surfaces when operating Demo Board e Turn off Demo Board when placing or removing measurement probes www irf com IRAUDPS1 Page 1 of 35 International tor Rectifier FERENCE DESIGN Item Table of Contents Page 1 Introduction 3 2 System Specifications 4 3 Functional Block Description 5 4 IRAUDPS1 Block Diagram 6 b Schematic IR2085 module 7 6 IRAUDPS1 mother board schematic 8 7 IR2085 module PCB layout 9 8 IRAUDPS1 mother PCB layout 10 11 9 BOM of IR2085 module 12 10 BOM of IRAUDPS1 mother board 13 14 11 BOM of Mechanical parts 14 12 Scalable IRAUDPS1 power table 14 13 Performance and test procedure 15 21 14 IRAUDPS1 Fabrication Drawings 22 24 15 Transformer winding instructions 25 27 16 Design example 28 17 Transformer design 28 30 18 MOSFET selection 30 19 Switching losses 31 20 Efficiency calculations 32 21 Frequency of oscillation 33 22 Selecting dead time 33 23 Over
17. N T R Rectifier Gate Drive Current required The Peak Gate drive current from IRS2085 Vcc Reate x 2 outputs 10V 22 ohms x2 0 9A The average current required to drive each gate depends on the switching frequency and Qg of the selected MOSFET which in this case Qg is 50nC nano coulombs from data sheet there are two FETS in parallel per gate drive Average Gate Current leare 2Qg x Fs 2 x 50E 9 x 50kHz 5mA Total Average Gate Current required 0 005A x 4 devices 0 02A MOFETS Power Dissipation losses The power dissipation at DC can be calculated as following 57A 4 devices 14 25A DC Power dissipation per device I x RDSon 2 Note RDSoy at 100C from Data sheet Fig 5 is divided by 2 because it is 50 duty cycle Power dissipation per device 14 25 x 7 5mOhms 2 0 76W Total power dissipation 57 x 1 4 7 5 mOhms 3249 x 1 875 6 091 watts MOSFET Switching loses The MOSFETS switching losses can be calculated as following Switching losses Turn ON_osses Turn OFF osses Gate Drive Losses From IRF6648 data sheet Trise TIME 29nS and Tea TIME 13nS and Qep 14nC Losses contributed by the size of the gate series resistor Gate drive series resistors actually slowdown the turn ON and turn OFF timing See Fig 2 R18 R21 Delay losses contributed by the gate series resistor Gres Delay Qoo Vcc Vw Reate Vu is the miller effect plateau voltage of gate charge curve It
18. Panasonic ECG 4 22 RES 22 OHM 1 8W 5 0805 SMD R18 R19 R20 R21 RHM22ARCT ND Rohm 2 1k RES 1 0K OHM 1 10W 5 0603 SMD R26 R28 RHM1 0KGCT ND Rohm 2 0 0 RES 0 0 OHM 1 8W 5 0805 SMD R27 R30 RHMO 0ARCT ND Rohm 1 47k RES 47K OHM 1 10W 5 0603 SMD R29 RHM47KGCT ND Rohm 1 470 RES 470 OHM 1 8W 5 0805 SMD R31 RHM470ARCT ND Rohm 1 LM393DR2G IC COMP DUAL OFFSET LV 8SOIC U1 LM393DR2GOSCT ND ON Semi 1 IR2085 Controller and Gate Driver U2 IR2085 International Rect www irf com IRAUDPS1 Page 12 of 35 International ef 13 Table 5 IRAUDPS1 Mother Board Bill of Materials Quantity Value Description Designator Digikey P N Vendor 4 1uF 50V CAP CER 1UF 50V X7R 1206 C3 C7 C8 C9 490 3908 1 ND Murata Electronics North 1 1000pF 200V CAP CER 1000PF 1096 200V X7R 1206 C21 478 1505 1 ND AVX Corporation 3 2 2nF 100V CAP CER 2200PF 1096 100V X7R 1206 C22 C33 C34 478 1519 1 ND AVX Corporation 4 1uF 100V CAP CER 1UF 100V X7R 1206 C23 C24 C31 C35 490 3909 1 ND Murata Electronics 4 0 01uF CAP 10000PF 50V CERM X7R 0603 C26 C27 C30 C32 PCC1784CT ND Panasonic ECG 3 0 1uF 250V CAP CERAMIC 1UF 250V X7R 1206 C28 C29 C25 399 4674 1 ND Kemet 3 3300uF 25V CAP 3300UF 25V ELECT PW RADIAL CP3 CP4 CP5 493 1842 ND Nichicon 4 1200uF 63V CAP 1200UF 63V ELECT PW RADIAL CP10 CP11 CP12 CP13 493 1958 ND Nichicon 1 open DIODE Comm Cathode ULT FAST 1
19. RES 10K OHM 1 10W 5 0603 SMD R50 R51 R52 R53 RHM10KGCT ND Rohm 2 2 2k RES 2 2K OHM 1W 5 2512 SMD R55 R56 PT2 2KXCT ND Panasonic ECG 2 22k RES 22K OHM 1 4W 5 1206 SMD R60 R61 RHM22KERCT ND Rohm 4 6 2 RES 6 2 OHM 1 4W 5 1206 SMD R70 R71 R72 R73 RHM6 2ERCT ND Rohm www irf com IRAUDPS1 Page 13 of 35 International TER Rectifier REFERENCE DESIGN 14 1 Toggle SW 3Pos Toggle SW 3Pos S1 EG2377 ND E Switch 2 Gold terminal block Gold terminal Block 8 AWG TB1 TB2 070 850 Audio Express 1 TB 2 terminals CONN TERM BLOCK 2POS 5MM PCB TB3 277 1022 ND Phoenix Contact 1 1714984 CONN TERM BLOCK 3POS 9 52MM PCB TB4 277 1272 ND Phoenix Contact 1 100K THERMISTOR 100K OHM NTC 0805 SMD TH1 490 2451 1 ND Murata Electronics 1 ZP42915TC Power Transformer TR1 Custom TR500 2085 Magnetics 2 SMAZ39 TP DIODE ZENER 1W 39V SMA Z1 Z2 SMAZ39 TPMSCT ND Micro Commercial Co Table 6 Mechanical BOM Quantity Description Value Digikey P N Vendor 1 Aluminum Bar heat spreader R2 Aluminum Bar 2085 Custom China 1 Aluminum Base heat sink R2 Aluminum Bar 2085 Custom 2085 China 1 Print Circuit Board IR2085 MB R2 PCB PCB IR2085_MB_R1 PCB Assy China 1 THERMAL PAD 080 4X4 GAPPAD THERMAL PAD 080 4X4 GAPPAD Ber164 ND Bergquist 2 Optional THERMAL PAD 007 W ADH Optional THERMAL PAD TO 220 173 7 240A Wakefield 4 SPACER ROUND 1
20. Thus the standby current will be 0 34A at 14V 4 9W which will meet the customer s specifications Turns ratio calculations If the primary windings are 4 turns and they are distributed equally spaced around the core as shown on Fig 30 and Fig 31 Thus Volts per turn ratio 2 14V 4 turns 3 5V per turn Turns required on secondary 50V 3 5V 14 turns Number of wires and gauge required Primary Windings Because the input current will be 57A the wire s gauge will be the biggest possible to fit into the core with the lowest DCR possible for a maximum efficiency and lower temperature dissipation Assuming 5 watts DC power dissipation on the primary side then Primary DCR maximum required 5W 57 5 3249 0 0015 ohms IRAUDPS1 www irf com Page 29 of 35 International mI REFERENCE DESIGN T R Rectifier Wire length required is 6 inches for 4 turns in this case in particular for Magnetics Core ZP42915TC Then considering copper DC resistance according to gauge table 9 below Thus a single 14 AWG magnet wire is required considering only the DC resistance DCR but considering the skin effect of the high frequency of operation which in this case will be 50 kHz therefore 5 wires in parallel 18 are required in order to minimize the skin effect and therefore minimize the AC resistance at 50 kHz Table 9 Round copper magnet wire DCR and AC DC Resistance ratio due to skin effect versus frequency
21. at any current protection desired by the following equation OCP resistor 0 6V OCP current Example If OCP desired is 20A Then Roce 0 6V 20A 0 03 ohms Thus R47 R48 R49 and R54 will be 0 06 ohms each one because two of them are in parallel IRAUDPS1 www irf com Page 33 of 35 International REFERENCE DESIGN TER Rectifier BJT gate driver option Notice on schematic Fig 2 and their PCB layout that it is prepared for extra BJT drivers Q3 Q6 that in this case they are not populated this is in case that the customer wants more than 4 MOSFETS in parallel for large power outputs applications Music Load NOTE All previous calculations were made for continuous sine wave load for the safe and reliable design the average currents and power dissipations actually will be 1 8 of power for soft music Y4 of power for heavy rock music and 3 8 of power with dead metal music and 1 2 of rated power for subwoofer amplifiers Music load Input current calculations RMS Input current with constant sine wave outputs at 1 kHz all channels driven Ianmssine wave 14V 800W 57A e peak music 57 X 1 4142 80A Isorr MUSIC 57A x 1 8 7 1A e rockmusic 57 X 14 14 2A e heavy uErAL music 57A x 5 8 21 3A e Subwoofer 57A x Ve 28A IRAUDPS1 www irf com Page 34 of 35 International p REFERENCE DESIGN T R Rectifier Revision changes descriptions Revision Changes description Date IRAUDPS1_R
22. ave rectifiers UVP Test 13 Decrease the source power supply slowly until it reaches around 8 volts while you observe LED2 or the oscilloscope LED2 will turn OFF or oscilloscope s pulse will disappear at 8V 1 5V Typical is 8 02V OVP1 Test 14 Increase the source power supply slowly until it reaches around 18V while you observe LED2 or the oscilloscope LED2 will turn OFF or the oscilloscope s pulse will disappear at 18V 1 5V Typical is 18 5V OVP2 Test 15 Increase the source power supply slowly until it reaches around 16V while you observe LED2 or the oscilloscope LED2 will begin blinking or the oscilloscope s pulse will decrease in duty cycle like Fig12 when B reaches 45V 2 5V Typical is 45 0V SCP Test 16 Adjust the source power supply to 14 4V then while IRAUPS1 is ON apply a short circuit between B and AGnd with external wires do not make the SC on the terminal board or it will burn said terminals LED1 will turn ON and LED2 will be OFF and stay OFF until the Rem OFF Test Switch is turned to OFF then ON again This is the latch of OCP 17 Repeat the last step for B and GND IRAUDPS1 www irf com Page 17 of 35 International ae REFERENCE DESIGN I amp R Rectifier Full Load Power Test 18 19 20 21 22 Turn OFF the IRAUDPS1 and Connect B and B to the Class D Amp IRAUDAMP8 IR2093 Turn ON the IRAUDPS1 the input current from the source power supply should be 0 85A 0 5A typical input curr
23. egative supply source Battery TB2 Terminal Board for Positive supply source B output TB4 1 Positive output of B Bus Rail Analog GND TB4 2 Output GND of B and B B output TB4 3 Negative output of B Bus Rail Switch Description Remote OFF Test Remote This position PS1 can be turned ON remotely by vehicle s ACC Accessory voltage or vehicle s amplifier OFF IRAUDPS is always OFF regardless of ACC input Test IRAUDPS1 can be turned ON manually or for test purpose LED Indicator Description LED1 Red Indicate the presence of a short circuit condition on B or B LED2 Blue Indicate the presence of PWM pulses from IR2085 LED3 Blue Indicate the presence of B voltage LED4 Blue Indicate the presence of B voltage Power Source Requirements The power source shall be capable of delivering 80 Amps with current limited from 1A to 80A during the test the output voltage shall be variable from 8V to 19V during the test Test Procedure Pre adjust the main source power supply to 14 4V and set current limit to 1A Turn on the main source power supply to standby mode On IRAUDPS1 Unit Under Test Set the Remote ON switch to OFF center Connect an oscilloscope probe on transformer terminals TR1 pin 1 Do NOT Connect the Class D Amp IRAUDAMPS IR2093 to B and B yet Connect the resistive load to the class D Amp Set the Audio OSC to 1 kHz and output level to 0
24. el 1 i gu o E E SI i 1 zs a 5 R50 Header 2 PET CIT 62 e e E DI L2 4 3 3uH 10A 2 034 3 uH 10A 2 4 14 4V i 14 4V a 2 q L6 LAOA E Sal 8 1 Fi 2 FBI 2 A R73 252 li M p T 1 4 3 ls E m 5 H gt SE i 3 cp i z 0 03R 3 al 2 p 2 D4 4 38 3 a a e a 5 a cr o jo E E LS 3 zze x8 heg 2 R49 Sou smazo Te m te Ha to a gt 0 lu 2sov 93 T E m 1 8 1 2 BIRETE El cB FB2 E 4 lvs2 E T E S iur fiar fiyr 3 gt 3 S E 0 03R ba ES ES 2 amp amp Tee A gt gt te a 23 c9 Fjo EL E ch 2 E AES ES 1 pa plies 1 jvst ZL E 4 E 3 0 luF250V 1 V Header 4 E 4 5 ES 2 cu 1uF i00V A oe a le 3 H S i IT ETTE Ca 3 ysl ZP42915TC swa i 12 J v luF NOReH ed 1 1uF i00V es z z TBI E 4B 1 2 la L2 R54 o t 5 LOZA 2E EJ lp ren E EJ lp rere eus VN lt mim Beets d 2 3 he open H tA mrecas 12 lt H BAA A 448 E s 0 03R DA m e vee OO l min 22K cars our re 2d R48 144V spew Header 2 d ng LEDI 1 2 185 3 3PS anal R45 RSS B AE 1 3 SL R32 le 1 2 0 03R 1 2 S RS T1 uu me 23k 3 1 off Ik 4 R S s R I a 35 SI A BP ay Renpte ON OFF E ME E NA 48 2 gas c Cd i 2 9 6 GND SGnd 22k S 5 ae FEES T 3 Uk vx Es lr C30 3 2 1 8 cS 3 1 2 2 2k AA I THI thermally connected to heat spreader me 19 ul E we ca E E 1 2 El 2 ES cumin cops 24 nternationa E 0 01uF a e L Fa IGR Rectifier Fig 3 IRAUPS1 Mother Boa
25. ent is 0 83A with the class D IRAUDAMP8 loaded with no signal input Increase the current limit from the source power supply to 35A Increase slowly the output level from the Audio Oscillator until the Class D amp gets 100W RMS per channel if resistive loads are 4 Ohms the outputs amplitude from amplifier will be 20V RMS Under these conditions the consumption current from the source power supply shall be 36 6A maximum this correlates to a 10 loss for each channel and a 20 loss of the IRAUDPS1 this is the power output and efficiency test 23 The output voltages from B and B should be 30V 2 5V 24 Monitor the transformer waveform it should be like Fig 14 below 25 The ripple current for B or B should be 3V P P maximum as shown on Fig 15 below Tek M Bi Tigd MPosi 216 0ns MEASURE Tek Jh H Tied MPos 216 0ns TRIGGER Y CH2 Off H Type Min d Ch Source AN i zu Mn 3 204 i ME 36 4V z 15 S en Coupling Freq Noise Reject 8 282MH2 cHi 100 M 5000s CH 380V CHT 1 004 M 250 us CHI 2 58V 24 ct 08 05 25 100 538kH2 CH1 vertical position 0 04 divs 40 04 Fig 14 TR1 waveform loaded Fig 15 B and B Ripple voltage OTP Test 26 Leave the class D amp running with 100W x 4 continuous power until IRAUDPS1 gets hot and trips the shut down level while the temperature on the heat sink is monitored next to the Thermistor sensor The temperature for shutdown will be 90C 5C and the time required to make OTP will be a
26. is 5 5V for IRF6648 Gres Delay 14E 9 10V 5 5V 22 ohms 14E 9 0 2A 70nS The delay time that caused by large gate resistor is much longer than the rise time that defined in IRF6648 datasheet Thus gate resistor delay time will be used to calculate MOSFET switching losses Turn ON tosses Fosc x Ya x Gres Delay xIx 2Vps 50kKHz x 0 5 x 70nS x 14 25A x 28V 0 7 watts per device IRAUDPS1 www irf com Page 31 of 35 International E REFERENCE DESIGN T R Rectifier Total Turn ON losses 0 7 x 8 5 6W Note Vps is multiplied by 2 because Vps occurs twice in Push Pull converters Turn OFF osses Fosc x Ve Gres Delay x 1x 2Vos 50kHz x 0 5 x 70nS x 14 25A x 28V 0 70 watts per device Total Turn ON losses 0 70 x 8 5 6W Gate losses Qg x Vaare X Fosc Qg from IRF6648 data sheet is 36nC typical Gate losses 36E 9 x 10 x 50khz 0 018W per FET Total Gate losses 0 018W x 8 0 144W Total switching losses 5 6 5 6 0 144 11 34W Output Rectifiers Losses DC rectifier losses V DIODE X lout 0 7V x 6 6A 4 62W per diode Total Diode rectifiers for B and B 4 62 x 4 18 48 watts Efficiency Total losses then will be Transformer losses MOSFETS losses switching losses output rectifiers losses core losses Core losses according to material P from Magnetics Inc data sheet is 2 watts at 50 kHz Total transformer losses Primary winding loses Secondary winding losses Core Losses 5W
27. nd P2 on terminals 1 2 and 2 4 65uH 75uH Inductance difference between windings P1 and P2 1uH maximum Inductance at S1 and S2 on terminals 5 7 and 7 8 470uH minimum Inductance difference between windings S1 and S2 2uH maximum DCR at P1 winding 1 2 and P2 winding 2 4 3 0mOhms max DCR at S1 terminals 5 6 and S2 terminals 7 8 46mOhms max Number of turns for P1 and P2 4 Turns 18 AWG x4 Number of turns for S2 and S2 10 Turns 20 AWG x 3 Leakage Inductance with S1 and S2 shorted 1uH max Resistance between Primary and Secondary P and Infini ipi nfinite S windings Resistance between any winding and core Infinite High Pot between primary and secondary windings 500VAC High Pot between any winding and core 500VAC Dimensions 1 4 OD x 0 80 Height Mounting See Fig 37 IRAUDPS1 www irf com Page 27 of 35 International Po REFERENCE DESIGN IGR Rectifier Design Example Assume the following customer specifications are required A 12V system automotive power supply to drive a stereo class D amplifier 300 Watts per channel into 4 ohms and the maximum standby power consumption of the power supply should be 5 watts at 14V battery voltage with no load also efficiency should be greater than 80 compact design size 3 inches wide 5 1 2 long and 1 Y high Voltages outputs required The first step is to calculate the output voltages and the input and output cur
28. on Fig 33 15 Wind 10 turns whit the three parallel wires at the same time evenly spaced around the core on same direction as shown on Fig 33 16 Leave 4 cm of wire at both ends Step No 5 Performing Start and Finish wires Mounting holes using an IR2085_MB_R2 PCB perform the next instruction Fig No 34 22 Perform P1 Start to fit into Pad 1 as shown Fig 6 Perform P1 finish and P2 Sstart to be fitted into pad 2 as shown on Fig No 34 this is the center tap of the Primary side Perform P2 finish to be fitted into mounting hole 3 as shown in fig No 6 Perform S1 start top winding to be connected on Pad 4 as shown on Fig 34 Perform S1 finish wire bottom winding to be connected at Pad 5 this is the center tap of the secondary side Perform S2 start top winding to the IRAUDPS1 Page 26 of 35 International TOR Rectifier REFERENCE DESIGN center tap on Pad 5 27 23 Perform S2 finish of bottom winding to be connected to hole 6 as shown on fig 35 24 Cut and strip magnet wires for Ye inches long to be performed as surface mounting as shown on Fig 35 25 Thin the transformer terminals as shown on Fig 36 26 Before mounting on PCB measure inductance according to next Table 8 Fig 36 Table 8 Transformer s Electrical Characteristics Inductance at P1 a
29. or Clock wise as shown on Fig 30 start is the top side and finish is the bottom side Wind 4 turns in parallel at the same time evenly spaced around the core as shown on Fig 30 Leave 4 cm of wire at both ends spaced 1 2 inch between ends as shown on Fig 30 Fig No 31 Step No 2 Winding P2 5 6 Cut 30cm of 1 0mm gage x 4 wires of magnet wire AWG 18 Start winding P2 starting on the end of P1 as shown in Fig 31 start is the top side and finish is the bottom side Wind the 4 at the same time between the spaces of P1 evenly spaced around the core in the same direction as shown on Fig 31 Leave 4 cm of wire at both ends spaced 1 2 inch between ends as shown on Fig 31 www irf com IRAUDPS1 Page 25 of 35 International TOR Rectifier 26 REFERENCE DESIGN Fig No 32 Step No 3 Winding S1 9 Cut 60cm of 20 AWG 0 86mm x 3 magnet wires 10 Start winding of S1 at 90 degrees forward respect to the start point of P1 as shown on Fig 32 start is the top side and finish is the bottom side 11 Wind 10 turns whit the three parallel wires at the same time evenly spaced around the core on same direction as shown on Fig 32 12 Leave 4 cm of wire at both ends Fig No 33 Winding S2 13 Cut 60cm of 20 AWG 0 86mm x 3 magnet wires 14 Start winding of S1 at 90 the end pf S1 forward respect to the start point of S1 as shown
30. ow leakage inductance so 4 turns on primary side is a good practice for now because it fits most of the requirements mentioned above of which the most important factor here is size and physical windings to achieve low leakage inductance and core material IRAUDPS1 www irf com Page 28 of 35 International REFERENCE DESIGN T R Rectifier Primary inductance Primary Inductance called here as Lp is 65uH that belongs to 4 turns according to Magnetics ZP42915TC permeability data sheet Magnetizing current The standby current with no load depends on the magnetizing idle of the power transformer called here as ly and it depends on the operating switching frequency called here as Fs Magnetizing current Im 5W of standby current 14V 0 354 Therefore this is the transformer s primary windings impedance current Thus Transformer magnetizing impedance Zm 14V 0 35A 40 ohms Then we assume that Zy is the same impedance of XL where XL 6 28 x Lp x Fs Therefore switching frequency Fs XL Lp x 6 28 Operating switching frequency calculation Because this is a push pull DC DC converter switching frequency is calculated as follows Operating switching frequency Fs Y XL Lp x 6 28 1 2 6 28 x 65uH 40 ohms 48 9 kHz Therefore we will use 50 kHz Verification of the computations Transformer primary windings Impedance XL 6 28 x 65uH x 50 kHz 20 41 ohms Im Y V XL ve 14V 20 41 0 34A
31. rd Schematic Drawing by M Rodriguez Mrodrig5 Girf com www irf com IRAUDPS1 Page 8 of 35 International TR Rectifier REFERENCE DESIGN IN 22900 mi 1 o7 Cl Tan wt IS2R UP IR2085 R3 03 8 Q5 LH jg H Fi gj 8 l 1 000 cmi J2 Note Install Ji J6 on back side bottom layer Fig 4 IR2085 Module Top silk screen layout TN OOO O OOOO OS ORO OJO Fig 5 IR2085 Module bottom side layout Mie DRE dom de I at dm xr E Ert J Fig 6 IR2085 Module Top side layout www irf com IRAUDPS1 Page 9 of 35 International TR Rectifier REFERENCE DESIGN IS 3 000 IN 3 000 IN m Fig 8 IRAUDPS1 Mother Board Top copper www irf com IRAUDPS1 Page 10 of 35 International TER Rectifier REFERENCE DESIGN III Fig 10 IRAUDPS1 Mother Board Bottom layout www irf com IRAUDPS1 Page 11 of 35 International T R Rectifier Bill of Materials REFERENCE DESIGN 12 Table 4 IRS2085 Module Quantity Value Description Designator Digikey P N Vendor 3 0 01uF CAP 10000PF 50V CERM X7R 0603 C1 C4 C5 PCC1784CT ND Panasonic ECG 1 470pF CAP CER 470PF 50V 5 COG 0603 C2 490 1443 1 ND Murata 1 100pF CAP CERAMIC 100PF 50V NPO 0603
32. rents the control circuits in the IRAUDPS1 are a good reference design to design the whole control system B and B are calculated as following AUDIO signal VRMS Sqrt 300W X 4 Ohms 34 6VRMS Thus B 34 6 x 1 4142 50VDC and B 50VDC Input Current required from Battery Input Current Loaded 300W x 2 600W If efficiency of the Class D amp is 90 then 600 x 1 1 660W If the efficiency of the power supply is 80 then 660W x 1 2 792W 800W Thus loaded 800W 14V 57A Output Current provided Total output current 660W 50V 13 2A Thus B 13 2 2 6 6A and B 6 6A Transformer Design Example The transformer design is a trade off between size operating frequency physical windings to achieve low leakage inductance form factor primary turns ratio to meet standby input current and type of core material Core Selection Core must be selected as power material composite and it can be chosen from any major manufacturers which are Magnetics Inc TDK Ferroxcube Siemens or Thomson Each manufacturer has a number of different powder core mixes of various materials to achieve different advantages so in this case Magnetics Inc core ZP42915TC is selected according the estimated size required to fit the power required Notice on IRADUPS1 Fig 30 and Fig 31 the primary windings are 4 turns and they are distributed equally and spaced around the core in order to provide uniform magnetic flux density therefore l
33. round 30 minutes when tested at ambient temperature 27 The thermal hysteresis shall be 10C and the time to recover it shall be one minute the time to make shutdown again will be 10 minutes 28 Load Regulation and Efficiency are shown in Fig 16 20 below IRAUDPS1 www irf com Page 18 of 35 International an REFERENCE DESIGN I amp R Rectifier Typical Performance Regulation 40 25 _ l 30 25 20 15 10 Voltage output 1 2 3 4 5 6 7 8 IRAUDPS1 500W Load Amps Fig 16 Effiency of IRAUDPS1 250W 100 90 80 70 60 50 40 30 20 Efficiency 0 7 14 21 28 35 42 49 56 63 70 138 204 268 Watts Fig 17 IRAUDPS1 www irf com Page 19 of 35 International m REFERENCE DESIGN IGR Rectifier Efficiency of IRAUPS1 500W 100 90 80 70 60 50 40 30 20 Efficiency 0 T T T T T T T 1 0 7 14 21 28 35 42 49 56 63 69 137 204 267 333 393 457 512 Watts Fig 18 Efficiency of IRAUDPS1 1000W 100 90 80 70 60 50 40 30 Effiency 20 0 T T H T T T T T T 1 0 7 14 21 28 35 42 49 56 63 69 137 267 393 512 626 732 833 Watts Fig 19 IRAUDPS1 www irf com Page 20 of 35 International m REFERENCE DES
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