ISL8117DEMO2Z User Guide
Contents
1. Submit Document Feedback 4 intersil UGO21 0 April 20 2015 User Guide 021 Typical Demonstration Board Performance Curves y 4sv vour 12V unless otherwise noted Continued 12 29 12 27 12 25 12 23 Vour V 12 21 12 19 12 17 lour A FIGURE 10 CCM MODE LOAD REGULATION lout A FIGURE 12 INPUT CURRENT COMPARISON WITH MODE CCM DEM VouT 50mV DIV Vu 48V lo 0A VouT 50mV DIV VIN 48V lo 20A GRANO 4us DIV FIGURE 14 OUTPUT RIPPLE CCM MODE Submit Document Feedback 5 intersil 12 15 j j 2 4 6 8 10 12 14 16 18 20 Jl j eme 1 12 15 18 23 28 33 38 43 48 53 5 ViN V FIGURE 11 CCM MODE LINE REGULATION E lt lt PHASE SOVIDIV inem E l il p PP LGATE SV DIV h ara A peo eee p ewe foray pini emeng al CLKOUT 5V DIV WW in i E I DEEN E Pi IL 5A DIV TG OR CURRENT DV FIGURE 13 PHASE LGATE CLKOUT AND INDUCTOR CURRENT WAVEFORMS Vin 48V l OA Voyr 50mV DIV Vin 48V lo 0A 1ms DIV VouT 50mV DIV Vin 48V lo 20A ayy WAN VAN 4us DIV FIGURE 15 OUTPUT RIPPLE DEM MODE UGO21 0 April 20 2015 User Guide 021 Typical Demonstration Board Performance Curves y 4sv vour 12y unless otherwise noted Continued ei Vour 5VIDIV so LGATE 5V DIV E lucTE CLKOUT 5V DIV pk LEUT2. 0155 A ee PGOOD 5V DIV IL 20A DIV 40ms DIV FIGURE 23 SHORT CIRCUIT WAVEFORMIS ViN 48V Submit Document Feedback intersil UGO21 0 April 20 2015 Schematic J1 gl 4 7u 100V H 7u 100V 10u 100V 10u 100V 10u 100V yI87P993 1ueuinoog HUIQNS a 10u 100V 10u 100V 10u 100V 10L 100V 10u 100V VIN R4 0 1u 25V R5 10u 10V C5 is 39 40 90 9k C4 12 aa lk24 C25 26 K r c28 C29 O 17 0 1u 100V A R9 20 C21 vin m 0 1u 100V vout mme R19 f n A 10k o z lt m C2 0 1u 25V 1u 50V J3 clk 1 vot 8 See 22U25V 22U 25V m 1u 50V 22U 25 Motel MOD SYNC 330u 35V 5 6u 28A 10 7 c22 cs ca col cT O JMP x vcc5 10u 10V J4 8 pis GND C3 I 0 047u 25V R1 43 2k VCC5 R2 2 26k 22U 25V 22U 25V 22U 25V 22U 25V 22U 25V 22U 25V 22U 25V 22U 25V 22U 25V vout 630 C31 C32 C33 C34 035 C35 C37 C38 E FIGURE 24 ISL8117DEM02Z SCHEMATIC GTOZ OZ ludy o Tzoon TZO Spiny 1950 User Guide 021 ISL8117DEMO22Z Bill of Materials MANUFACTURER REFERENCE PART QTY UNITS DESIGNATOR DESCRIPTION MANUFACTURER ISL8117DEMO2ZREVAPCB 1 ea PWB PCB ISL8117DEMO2Z REVA ROHS SHENZHEN MULTILAYER PCB TECHNOLOGY CO LTD CGA9N3X7S2A106K230KB 8 ea C12 C23 C24 C25 C26 CAP SMD 2220 10pF 100V 10 X7S AEC TDK C27 C28 C29 Q200 ROHS GRM32ER71E226KE15L 12 ea a C8 C9 C1
3. to the power train it is recommend to use full ground planes in the internal layers with shared SGND and PGND to simplify the layout design Otherwise use separate ground planes for power ground and small signal ground Connect the SGND and PGND together close to the IC DO NOT connect them together anywhere else The loop formed by the input capacitor the top FET and the bottom FET must be kept as small as possible Ensure the current paths from the input capacitor to the MOSFET to the output inductor and the output capacitor are as short as possible with maximum allowable trace widths Place the PWM controller IC close to the lower FET The LGATE connection should be short and wide The IC can be best placed over a quiet ground area Avoid switching ground loop currents in this area Place VCC5V bypass capacitor very close to the VCC5V pin of the IC and connect its ground to the PGND plane J f Place the gate drive components optional BOOT diode and BOOT capacitors together near the controller IC 8 The output capacitors should be placed as close to the load as 10 11 12 13 possible Use short wide copper regions to connect output capacitors to load to avoid inductance and resistances Use copper filled polygons or wide but short trace to connect the junction of upper FET lower FET and output inductor Also keep the PHASE node conn
4. intersil User Guide 021 ISLS117DEMO2Z Demonstration Board User Guide Description The ISL8117DEMO2Z demonstration board shown in Figure 1 features the ISL8117 The ISL8117 is a 60V high voltage synchronous buck controller that offers external soft start independent enable functions and integrates UV OV OC OT protection Its current mode control architecture and internal compensation network keep peripheral component count minimal Programmable switching frequency ranging from 100kHz to 2MHz helps to optimize inductor size while the strong gate driver delivers up to 3OA for the buck output Specifications The ISL8117DEMO2Z demonstration board is designed for high current applications The current rating of the ISL811 DEMOZ2Z is limited by the FETs and inductor selected The ISL8117 gate driver is capable of delivering up to 20A for the buck output as long as the proper FETs and inductor are provided The electrical ratings of ISL8117DEMO2Z are shown in Table 1 TABLE 1 ELECTRICAL RATINGS Key Features Small compact design Wide input range 18V to 60V High light load efficiency in pulse skipping DEM operation Programmable soft start Optional DEM CCM operation Supports prebias output with SR soft start External frequency sync e PGOOD indicator OCP OVP OTP UVP protection References e The ISL8117 datasheet Ordering Information PARAMETER RATING Input Voltage 18V to 60V Switching Frequenc
5. IL 10A DIV 4ms DIV FIGURE 16 CCM START UP WAVEFORMS Vin 48V l OA Vout 5VIDIV SS 1V DIV EN5VIDIV HEN I rTHFV Y PGOOD 5V DIV ponen SERT attt 20ms DIV FIGURE 18 CCM START UP WAVEFORMS Vin 48V l OA SS 500mV DIV Vour 10V DIV PGOOD 5V DIV E 1ms DIV FIGURE 20 TRACKING WAVEFORMS Vin 48V l OA Vout 5VIDIV Le LGATE 5V DIV u L CLKOUT 5V DIV 3T3CLECHIT IL 10A DIV ENINDUCTOR Rad 4ms DIV FIGURE 17 DEM START UP WAVEFORMS Vin 48V l OA Vout 5VIDIV SS 1V DIV Devout EN 5V DIV TEN PGOOD 5V DIV I dpo Or m t ot 20ms DIV FIGURE 19 DEM START UP WAVEFORMS Vin 48V lo OA SYNC 5V DIV ma m s rS Commented wama PEE LT rh p P LGATE 5V DIV W ATE tat fraise Bari was CLKOUT 5V DIV IL 5A DIV E Mi OR C A P SY W 2us DIV FIGURE 21 FREQUENCY SYNCHRONIZATION WAVEFORMS Vin 48V lo 0A Submit Document Feedback 6 intersil UGO21 0 April 20 2015 User Guide 021 Typical Demonstration Board Performance Curves y 4sv vour 12y unless otherwise noted Continued oa A Vout 500mV DIV l i louT 10A DIV ISA AL FAT A A 400us DIV FIGURE 22 LOAD TRANSIENT Vin 48V lo OA TO 20A 1A us CCM MODE Vout 10V DIV Eve cum
6. 0 C30 C31 CAP SMD 1210 22uF 25V 10 X7R ROHS MURATA C32 C33 C34 C35 GRM32ER71E226KE15L 0 ea b C36 C37 C38 CAP SMD 1210 22pF 25V 10 X7R ROHS MURATA CO603X7R101 104KNE 2 ea C4 C21 CAP SMD 0603 01 100V 1096 X7R ROHS VENKEL GRM39X7R104K025AD 2 ea C5 C20 CAP SMD 0603 0 1pF 25V 10 X7R ROHS MURATA C1608X5R1H105K 2 ea C2 C22 CAP SMD 0603 1pF 50V 10 X5R ROHS TDK ECJ 1VB1A106M 2 ea C1 C17 CAP SMD 0603 10uF 10V 20 X5R ROHS PANASONIC GRM188R71H221KA01D 1 ea C6 CAP SMD 0603 220pF 50V 10 X7R ROHS MURATA GRM188R71E473KA01D 1 ea C3 CAP SMD 0603 0 047pF 25V 10 X7R MURATA ROHS CGA6M3X7S2A475K200AB 2 ea C39 C40 CAP SMD 1210 4 7 pF LOOV 10 X7S ROHS TDK EEE FP1V331AP 1 ea C11 CAP SMD 10x10 2mm 330yF 35V 20 PANASONIC ALUM ELEC ROHS IHLP6767GZER5R6M11 1 ea LI COIL PWR INDUCTOR SMD 17 15mm2 5 6uH VISHAY 20 28A ROHS 68000 236HLF 1 ea J5 CONN HEADER 1x3 BREAKAWY 1X36 BERG FCI 2 54mm ROHS 69190 202HLF 1 ea JG CONN HEADER 1X2 RETENTIVE 2 54mm BERG FCI 0 230X 0 120 ROHS SPCO2SYAN 2 ea 1J5 J6 CONN JUMPER SHORTING 2PIN BLACK SULLINS GOLD ROHS MBR1H100SFT3G 1 ea DI DIODE RECTIFIER SMD 2P SOD 123FL 100V ON SEMICONDUCTOR 1A ROHS ISL80138IVEAJZ 1 ea U3 IC 40V LDO ADJ LINEAR REGULATOR 14P INTERSIL HTSSOP ROHS ISL8117FRZ 1 ea U2 IC 55V SWITCHING CONTROLLER 16P OFN INTERSIL ROHS BSCO67NO6LS3G 3 ea 0Q2 03 04 TRANSISTOR MOS
7. N CHANNEL 8P INFINEON TECHNOLOGY PG TDSON 8 60V 50A ROHS ERJ 3EKF20ROV 2 ea R9 R15 RES SMD 0603 200 1 10W 1 TF ROHS PANASONIC CR0603 10W 000T 1 ea R23 RES SMD 0603 00 1 10W TF ROHS VENKEL RK73H1JT1002F 3 ea R5 R19 R21 RES SMD 0603 10k 1 10W 1 TF ROHS KOA CRO603 10W 1003FT 1 ea R14 RES SMD 0603 100k 1 10W 196 TF ROHS VENKEL CRO603 10W 2003FT 1 ea R6 RES SMD 0603 200k 1 10W 1 TF ROHS VENKEL RCOGOSFR 072K26L T ea R2 RES SMD 0603 2 26k 1 10W 196 TF ROHS YAGEO RCOGOSFR 0730K9L 1 ea R20 RES SMD 0603 30 9k 1 10W 196 TF ROHS YAGEO CRO603 10W 3601FT 1 ea R3 RES SMD 0603 3 6k 1 10W 196 TF ROHS VENKEL RCO603FR 0743K2L Pb free 1 ea R1 RES SMD 0603 43 2k 1 10W 196 TF ROHS YAGEO CRO603 10W 7501FT 1 ea R7 RES SMD 0603 7 5k 1 10W 196 TF ROHS VENKEL Submit Document Feedback 9 intersil UGO21 0 April 20 2015 User Guide 021 ISL8117DEMO2Z Bill of Materials continues MANUFACTURER REFERENCE PART QTY UNITS DESIGNATOR DESCRIPTION MANUFACTURER ERJ 3EKF9092V 1 ea R4 RES SMD 0603 90 9k 1 10W 196 TF ROHS PANASONIC 7795 2 ea J1 J2 HDWARE TERMINAL M4 METRIC SCREW TH KEYSTONE 4P SNAP FIT ROHS 7798 2 ea 3 4 HDWARE TERMINAL M4 METRIC SCREW TH KEYSTONE 6P SNAP FIT ROHS SJ 5003SPBL 4 ea Bottom four corners BUMPONS 0 44inW x 0 20inH DOMETOP 3M BLACK 0 ea Q1 DO NOT POPULATE OR P
8. URCHASE Intersil Corporation reserves the right to make changes in circuit design software and or specifications at any time without notice Accordingly the reader is cautioned to verify that the document is current before proceeding Submit Document Feedback For information regarding Intersil Corporation and its products see www intersil com 10 intersil UGO21 0 April 20 2015 ISL8117DEMO2Z PCB Layout xyoeqpaoej UIVWNIOJ 1uqns e WW ha ha Mole EE e e p 0 A IK me FIGURE 25 TOP LAYER FIGURE 26 SECOND LAYER SOLID GROUND TZO Spiny 950 eeeccccccc 00000000 tttth 2 uns 0 HE EE o e e 0 SOTO A e e e e e FIGURE 27 THIRD LAYER FIGURE 28 BOTTOM LAYER GTOZ OZ ludy o Tzoon S ISLS8117DEMO2Z PCB Layout Continued 15L811 DE EVA l I a ha N E me NEN E B m E LI a p E l THI A E j CA e SABLE ill ALL 1 INTERSIL Intersil FIGURE 29 SILKSCREEN TOP FIGURE 30 SILKSCREEN BOTTOM z Bs N SG a o TZO Spiny 950
9. ection to the IC short DO NOT unnecessarily oversize the copper islands for the PHASE node Since the phase nodes are subjected to very high dv dt voltages the stray capacitor formed between these islands and the surrounding circuitry will tend to couple switching noise Route all high speed switching nodes away from the control circuitry Create a separate small analog ground plane near the IC Connect the SGND pin to this plane All small signal grounding paths including feedback resistors current limit setting resistor soft starting capacitor and EN pull down resistor should be connected to this SGND plane Separate the current sensing trace from the PHASE node connection Ensure the feedback connection to the output capacitor is short and direct LOAD Sab T Sy FIGURE 4 PROPER TEST SET UP Submit Document Feedback 3 intersil UGO21 0 April 20 2015 User Guide 021 Typical Demonstration Board Performance Curves y 4sv vour 12v unless otherwise noted EFFICIENCY EFFICIENCY 0 2 4 6 8 10 12 14 16 18 20 louT A FIGURE 6 DEM EFFICIENCY vs LOAD Vout DN Vour V 0 2 4 6 8 10 12 14 16 48 20 lout A FIGURE 7 LOAD REGULATION Vour 5V EFFICIENCY EFFICIENCY 0 2 4 6 8 10 12 14 16 48 20 lour A FIGURE 8 CCM EFFICIENCY vs LOAD FIGURE 9 DEM EFFICIENCY vs LOAD
10. s significant impedance Also the peak gate drive current rises significantly in an extremely short time Transition speed of the current from one device to another causes voltage spikes across the interconnecting impedances and parasitic circuit elements These voltage spikes can degrade efficiency generate EMI and increase device overvoltage stress and ringing Careful component selection and proper PC board layout minimizes the magnitude of these voltage spikes There are three sets of critical components in a DC DC converter using the ISL8117 the controller the switching power components and the small signal components The switching power components are the most critical from a layout point of view because they switch a large amount of energy which tends to generate a large amount of noise The critical small signal components are those connected to sensitive nodes or those supplying critical bias currents A multilayer printed circuit board is recommended Submit Document Feedback 2 intersil UGO21 0 April 20 2015 User Guide 021 Layout Considerations 1 The input capacitors upper FET lower FET inductor and output capacitor should be placed first Isolate these power components on dedicated areas of the board with their ground terminals adjacent to one another Place the input high frequency decoupling ceramic capacitors very close to the MOSFETs If signal components and the IC are placed in a separate area
11. ue the minimum Vin can be reset to a lower value by changing the ratio of R4 and Rs The minimum EN threshold that V y can be set to is 4 5V The rated load current is 20A with the OCP point set at minimum 25A at room temperature ambient conditions The temperature operating range is 40 C to 125 C Please note that air flow is needed for higher temperature ambient conditions Evaluating the Other Output Voltages The ISL8117DEMO2Z kit output is preset to 12V however the output can be adjusted from 5V to 24V The output voltage programming resistor R gt will depend on the desired output voltage of the regulator and the value of the feedback resistor R4 as shown in Equation 1 0 6 R R EQ 1 Table 3 shows the component selection that should be used for the respective Voyr of 5V 12V and 24V TABLE 3 EXTERNAL COMPONENT SELECTION VIN MAX Vout Ro R4 R7 L4 Ge RANGE lou DN 5 9k 36k 75k IHLP6767GZER3R3M11 150pF 8V 60V 20A 3 3uH 35A 12V 2 26k 90 9k 7 5k IHLP6767GZERSR6M11 220pF 18V 60V 20A 5 6uH 28A 24V 1 1k 150k 3 3k IHLP6767GZER100M11 470pF 28V 60V 104 10uH 19A Layout Guidelines Careful attention to layout requirements is necessary for successful implementation of an ISL8117 based DC DC converter The ISL8117 switches at a very high frequency and therefore the switching times are very short At these switching frequencies even the shortest trace ha
12. y 200kHz PART NUMBER DESCRIPTION ISL8117DEMO2Z High Voltage PWM Step Down Synchronous Buck Controller Output Voltage 12V Output Current 20A OCP Set Point Minimum 25A at ambient room temperature FIGURE 1 ISL8117DEMO2Z DEMONSTRATION BOARD TOP Recommended Testing Equipment The following materials are recommended to perform testing e OV to 60V power supply with at least 30A source current capability Electronic loads capable of sinking current up to 30A Digital Multimeters DMMs e 100MHz quad trace oscilloscope A 1508 REVAO EM BEI ISL8147DEMO2Z MILAN G O Ca FIGURE 2 ISL8117DEMO2Z DEMONSTRATION BOARD BOTTOM April 20 2015 1 CAUTION These devices are sensitive to electrostatic discharge follow proper IC Handling Procedures UGO21 0 1 888 INTERSIL or 1 888 468 3774 Copyright Intersil Americas LLC 2015 All Rights Reserved Intersil and design is a trademark owned by Intersil Corporation or one of its subsidiaries All other trademarks mentioned are the property of their respective owners User Guide 021 Quick Test Guide 1 Jumper J5 provides the option to select CCM or DEM Please refer to Table 2 for the desired operating option Ensure that the circuit is correctly connected to the supply and electronic loads prior to applying any power Please refer to Figure A for proper set up 2 Turn on the power supply 3 Adjust input voltage V
13. y within the specified range and observe output voltage The output voltage variation should be within 396 4 Adjust load current within the specified range and observe output voltage The output voltage variation should be within 396 5 Use an oscilloscope to observe output voltage ripple and phase node ringing For accurate measurement please refer to Figure 3 for proper test set up TABLE 2 JUMPER POSITION FUNCTION J5 CCM pins 1 2 Continuous current mode DEM pins 2 3 Diode emulation mode J6 Pins 1 2 Disable the PWM OUTPUT CAP OR MOSFET FIGURE 3 PROPER PROBE SET UP TO MEASURE OUTPUT RIPPLE AND PHASE NODE RINGING Functional Description The ISL8117DEMO2Z is a compact design with high efficiency and high power density As shown in Figure 4 on page 3 18V to 60V Vix is supplied to J1 and J2 The regulated 12V output on J3 and J4 can supply up to 20A to the load Due to high thermal efficiency the demonstration board can run at 20A continuously without air flow in room temperature ambient condition As shown in Table 2 connector J5 provides selection of either CCM mode shorting pin 1 and pin 2 or DEM mode shorting pin 2 and pin 3 Connector J6 provides an option to disable the converter by shorting its pin 1 and pin 2 Operating Range The input voltage range is from 18V to 60V for an output voltage of 12V If the output voltage is set to a lower val
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