User Manual - Future Lighting Solutions
Contents
1. Fig 11 silk screen bottom side NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 15 of 24 NXP Semiconductors UM10321 UM10321 1 5511750 TRIAC dimmable LED driver Fig 12 PCB layout top layer 5511750 Fig 13 PCB layout bottom layer NXP B V 2009 All rights reserve2. 23 24 founded by Please be aware that important notices concerning this document and the product s described herein have been included in section Legal information NXP B V 2009 All rights reserved For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com Date of release 25 September 2009 Document identifier UM10321 1
3. Rez 00 E 10k0 2koo 8V2 Circuit diagram of the 75 W mains dimmable LED driver board 230 V AC 50 HZ version 9 yna 2vIH L 09211855 SIOJONPUODIWISS dXN LEEOLINN NXP Semiconductors UM10321 SSL1750 TRIAC dimmable LED driver 7 PCBsilk screen and layout UM10321 1 WWW NXP COM 2 Mains Diwmable LEO Driver Dm Fig 10 PCB silk screen top side 5511750
4. Table 7 No Pin Start Finish N1 4 1 11 51 5 12 2 9 10 3 11 12 52 5 l4 N4 2 4 I5 N5 5 6 6 7 8 l6 Pin 3 cut off 2 3 UM10321 1 2 N3 6 and 6 use triple insulated wire Use maximum diameter or parallel wires for maximal fill NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 18 of 24 NXP Semiconductors UM10321 SSL1750 TRIAC dimmable LED driver Table8 Electrical characteristics Pin Specification Remark Inductance 1 2 650 uH 10 60 kHz 1V Leakage inductance 1 2 5 uH 274 all short Flyback core and bobbin Core PQ 3220 Core material 3C94 44 or equivalent Al 400 nH 1 Dimensions in mm Fig 17 Flyback bobbin PQ 3220 12 pin vertical type 9 Bill Of Materials BOM Table 9 Bill of material SSL1750 75 W mains dimmable board 230 V version Reference Manuf Value Description Pkg type A3 LMV710 Operational amp single 2 7 V to 5 5 V SOT23 5 SS RR i o 3 mVos A48A 4 TL431ACD Voltage reference programmable shunt SO8 2 5 V to 36 V SO8 A5 NXP SSL1750T SMPS control IC for LED drivers SO16 B1 green LED 3 mm green diffused tinted LED3 V 6 mcd at 10 mA B2 B3 HCPL817 Opto coupler single OC 5000 V DIPAW 50 600 2 5 47 nF Capacitor Class X2 CFILM10MMx 305 V AC pitch 210 mm
5. VOSENSE S nn 10 PECORVER FBDRVER i t 1 2 1 10 2 1 R23 82k0 1000p 440V Y1 R24 5k10 2 R20 1k00 Ffliw 4 R27 R87 Hg 1 2 2 VINSENSE 7 vmsense 8209 1 LATCH R30 120E 560k 1k00 B2 R75 0E 1 2 GND recm 3 4 1 1 gt i 3 E SSL1750T sD 2 R58 10k0 R26 HCPLB17 Bae 390 Ree 828 t i A 1r 94 ul 2k20 33 eot vor R31 E i 1k00 120k Ria c20 c19 Readers 7 3 C24 k cas 5 ton ST 0 ou 180 8 470nF MEV voc 632 221 R37 10 0 2 12 1 Y4 R5030 529 heatsink SSL1750 R98 e 4 2 C30 M E R97 330k R59 R60 var R99 R100 zs NGC 330k 330k 2 1 21 2 R101 evwse 1 20 2 7 s e E Tor E Rag auo heatsink SSL 1750 R102 330k R39 E 330k y 330k 470 R57 L Ree B3 VB3 1M00 1 4 R105 2 8 1 2 1 2 Va TS 330k TES 22 1 2 1 2 2 1 1 945 o 330k STP5SNK50Z PMLL4448 a R94 B p vy HO 77 OE Rag C34 R47 9 B 1 2 T BCB46B C27 033 ssoniiev 1M00 B y v29 C40 el 100n ep tan a R65 10u 400V u 1 R43 0 33E 1W i BC846B Ys 33k0 al 41 15 1 4
6. 0 7 94 6V 11 aux Where is the number of secondary turns and wa is the number of auxiliary turns of the transformer The value of RggAux can be adjusted to the turns ratio of the transformer thus making an accurate OVP detection possible To restart after an over voltage event the mains should be interrupted to reset the internal latch PFC bus voltage protection In case of an over voltage on the PFC bus the PFC controller will stop operating Temperature protection The IC does have an internal temperature protection When the internal temperature is above typical 140 C the IC switches off to protect itself and the application A NTC could be placed on the board which should be connected to the latch pin to shutdown the circuit if the ambient temperature is too high 5 Measurements UM10321 1 5 1 Power Factor Correction PFC Due to the integrated PFC controller the board will have a power factor above 0 95 for mains of 230 V AC 10 Table gives the actual values Measurements were executed under full load 75 W Table 3 Power factor versus mains voltage 50 Hz mains Mains V AC rms Power factor 207 0 979 220 0 975 230 0 971 240 0 965 245 0 960 250 0 956 253 0 957 NXP 2009 All rights reserved User manual Rev 01 25 September 2009 11 of 24 NXP Semiconductors UM1 0321 UM10321 1 5 2 5 3 SSL1750 TRIAC dimmable LED driver Efficiency Wi
7. 125 W 100 ppm RC12H 805 R14 R18 10 0 Q Resistor 1 96 0 125 W 100 ppm RC12H R0805 R22 R15 12 Resistor 1 96 0 125 W 100 ppm RC12H R0805 R17 R50 10 0 Q Resistor 1 0 125 W 100 ppm RC12H R0805 R20 R21 1 KQ Resistor 1 0 125 W 100 ppm RC12H R0805 R76 R87 R88 R95 R23 82 Resistor 1 96 0 125 W 100 ppm RC12H R0805 R24 5 1 Resistor 1 96 0 125 W 100 ppm RC12H R0805 R26 39 Resistor 1 96 0 125 W 100 ppm RC12H R0805 R27 560 Resistor 1 96 0 125 W 100 ppm RC12H R0805 R28 R43 33 Resistor 1 96 0 125 W 100 ppm RC12H 805 R29 DNP R30 120 0 Resistor 1 96 0 125 W 100 ppm RC12H 805 R31 120 Resistor 1 96 0 125 W 100 ppm RC12H R0805 R40 R48 Resistor 1 0 125 W 100 ppm RC12H 805 R56 R45 470 Resistor 1 96 0 125 W 100 ppm RC12H 805 R46 680 Resistor 1 96 0 125 W 100 ppm RC12H R0805 R62 R82 2 2 KQ Resistor 1 0 125 W 100 ppm RC12H 805 R96 R63 R68 0 2 W Resistor metal Strip 1 9o 1 W R2512 R65 330 1W Resistor Thick Film 1 96 1 W 200 V R2512 R66 R70 10 1W Resistor Thick Film 1 1 W 200 V R2512 R72 R73 R67 DNP R71 R75 00 Resistor R0805 OE jumper 0805 R77 R74 TBD R78 R79 1kQ 1W Resistor Thick Film 1 1 W R2512 R90 R97 R83 R84 3 3 KQ Resistor 1 96 0 250 W 100 ppm RCO2H R1206 R85 R86 15 Resistor 1 96 0 125 W 100 ppm RC12H R0805 R89 100 Resistor 1 96 0 125 W 100 ppm RC12H R0805 R
8. 20 96 5 C3 3300 pF 1kV Capacitor ceramic high voltage Class 2 CDISC C4 10nF 1kV Capacitor ceramic high voltage C6 68 uF 450 V Cap elco radial 450 V 85c 20 96 CPRAD C7 C31 22 uF 100 V Elco radial 8 mm x 11 5 mm p 3 5 CPRAD 105 0 68 ESR 20 UM10321 1 NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 19 of 24 NXP Semiconductors UM10321 5511750 TRIAC dimmable LED driver Table 9 Bill of material 5511750 75 W mains dimmable board 230 V version continued Reference Manuf Value Description Pkg type C9 C20 10 nF Capacitor ceramic X7R 50 V 10 96 0805 C23 C10 100 pF 630V Capacitor ceramic COG 630 V 5 96 C1206 C12 C16 220 pF 630V Capacitor ceramic 630 V 5 C1206 C13 220 nF 16V Capacitor ceramic X7R 16 V 10 0805 C14 C30 47 uF 50V Cap elco radial 50 V esr 0 65 CPRAD 105 20 d 6 3 h 11 p2 5 C15 1 uF 50V Capacitor ceramic X5R 50 V 20 C0805 C19 C34 330 nF 16 V Capacitor ceramic X7R 16 V 10 C0805 C24 150 nF 16 V Capacitor ceramic X7R 16 V 10 C0805 C25 C41 470 nF 16V Capacitor ceramic X7R 16 V 10 96 C0805 C27 C33 100 nF Capacitor ceramic X7R 50 V 10 C0805 C38 C29 C37 10 uF 63 V Elco radial 63 V 20 5 mm x 11 mmx CPRAD 2mm C32 22 nF Capacitor ceramic X7R 50 V 10 0805 C35 470 nF Capacitor MKP Class X2 CFILM22 5 m 305 V AC
9. 3 4 4 4 5 4 5 1 4 5 2 4 5 3 4 5 4 5 1 5 2 5 3 5 4 5 4 1 8 1 8 2 10 10 1 10 2 10 3 11 Introduction 3 IC description 3 4 Board connections 4 an LP 4 Quiput Leone Reb retener 4 Functional description 5 Output current regulation 6 Triac phase detection 6 Bleeder 2 c Ree Rh 8 Flyback shut down 9 Protections snc e RR ER 10 Output under voltage protection 10 Output over voltage protection 11 PFC bus voltage protection 11 Temperature 11 11 Power Factor Correction 11 222 AS RE 12 Harmonic currents 12 Dimming 2er CER 13 Dimming 13 Circuit diagram 14 silk screen and layout 15 Transformer specification 17 PEG uals eae Sor Russo Sat ae aeu fous 17 Flyback zu Phe ee erac 18 Bill Of Materials 19 Legal 23 Definitions 23 Disclaimers 2o ier de 23
10. 3 2 Input On the AC input connector X1 you can connect 230 V AC x 10 96 50 Hz The mains can be connected to the board directly or via a triac dimmer See Section 5 4 for more details about the different dimmers Output The anode of the LED strings should be connected to the of connector X2 The cathode should be connected to the of the same connector The board is designed to provide 1000 mA of current into a LED load It is advised to use only one LED string When more than one LED string is used care must be taken to balance the current in each string to prevent one LED string having higher currents than other strings In Table 2 example configurations are listed of different LED loads NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 4 of 24 NXP Semiconductors UM1 0321 5511750 TRIAC dimmable LED driver The total forward voltage Vfw of the LED string should not exceed the maximum output voltage of the board see Section 4 5 2 A lower total Viw is allowed as long as the output stays above the minimum output voltage see Section 4 5 1 Table 2 Example of LED configurations Current per led string LED strings Number of LEDSs Vtw mA per string V 330 3 24 3 15 500 2 23 3 25 1000 1 22 3 4 4 Functional description UM10321 1 The board is made around the SSL1750 IC SSL1750 includes a and a flyback controller integrated in one SO 16 p
11. peak current to 25 96 of its maximum value This will ensure high efficiency at low power while minimizing audible noise from the transformer The proprietary high voltage BCD800 process makes direct start up possible from the rectified universal mains voltage in an effective and green way A second low voltage Silicon On Insulator SOI IC is used for accurate high speed protection functions and control The SSL 1750 enables the design of highly efficient and reliable LED drivers at power requirements up to 250 W it can be designed with a minimum number of external components UM10321 1 NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 3 of 24 NXP Semiconductors UM1 0321 SSL1750 TRIAC dimmable LED driver 2 Specification The main specification is given in Table 1 Table 1 Specification for the SSL1750 dimmable board Type Value Comment AC line input voltage 230 V 10 DC Output current 1000 mA x 10 96 When not dimmed Output Power 75 W 10 96 When not dimmed DC Output Voltage 56 V to 82V Depending on LED forward voltage Dimming range 100 mA to 1000 mA Depending on dimmer Driver Efficiency gt 85 96 Over whole input voltage range With 75 W load and no dimming Power Factor gt 0 95 For 230 V 10 96 mains and no dimmer used Fig 1 Photo of the dimmable 75 W LED driver board 3 Board connections UM10321 1 3 1
12. pitch 22 mm X 5 mm 20 x8 5 mm C39 1000 pF 440 V Capacitor ceramic high voltage Y1 CDISC Y1 C40 10 uF 400 V Elco radial 10 mm x 20 mm x 5 mm CPRAD 20 ED serie F1 Fuse holder Fuse holder for 5 mm x 20 mm FUSE H 20x 5x20 5 F2 1A Fuse 5 mm x 20 mm time lag 5mm x 20 m L2 18 mH Inductor choke common 1 1 TH_CM_IND R 640 L5 60 Q Inductor Solid Chip Ferrite HF smd 10603 at100 MHz L7 39 O at Inductor Solid Chip Ferrite HF smd 10805 100 2 18 27 uH Inductor Choke 1 6 A R 58 mQ LRAD5mm10 19 2x1 5 mH Inductor choke CM 2 A 150 CM TH L10 1 5 mH Inductor Choke 850 mA LRAD7 5mm2 580 0 R1 R2 1MQ Resistor 1 0 125 W 100 ppm RC12H R0805 R39 R47 R57 R59 R60 R93 R3 R51 2 7 Resistor 1 0 125 W 100 ppm RC12H R0805 R52 R80 R81 R4 R6 43 Resistor 1 0 125 W 100 ppm RC12H R0805 R8 62 Resistor 1 96 0 125 W 100 ppm RC12H 805 UM10321 1 NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 20 of 24 NXP Semiconductors UM1 0321 SSL1750 TRIAC dimmable LED driver Table 9 Bill of material 5511750 75 W mains dimmable board 230 V version continued Reference Manuf Value Description Pkg type R10 R33 10 Resistor 1 0 125 W 100 ppm RC12H R0805 R37 R42 R54 R55 R58 R61 R94 R11 R19 470 Resistor 1 0
13. than 85 96 has a high power factor above 0 95 over the whole voltage input range and the THD falls within the limits for class C equipment Making this board ideal for dimmable high power LED lighting systems The board has been optimized for triac based dimmers As different triac dimmers have different specifications the dimming performance of the reference board might vary based on the used dimmer Transistor dimmers and other non triac dimmers will not work with this board 1 1 IC description The 551 1750 is a Switched Mode Power Supply SMPS controller IC suitable for driving LED applications from 25 W up to 250 W For LED power requirements below 25 W the NXP SSL210x family is preferred The SSL1750 combines Power Factor Correction PFC and a flyback controller Its high level of integration allows the design of a cost effective high efficiency LED power supply with a low number of external components The special built in green functions provide high efficiency at all power levels This applies to quasi resonant operation at high power levels quasi resonant operation with valley detection as well as reduced frequency operation at lower power levels At low power levels the PFC switches over to burst mode control to maintain high efficiency In burst mode soft start and soft stop functions are added to eliminate audible noise During low power conditions the flyback controller switches to frequency reduction mode and limits the
14. the input sense voltage measured across the sense resistors R66 R70 R72 R73 with the reference voltage An opto coupler is directly connected to the flyback control input to control the flyback frequency and mode NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 7 of 24 NXP Semiconductors UM1 0321 5511750 TRIAC dimmable LED driver The resistive divider formed by R30 and R65 sets an offset voltage on the current sense input This makes sure that the load current can be controlled down to zero The offset voltage corresponds with the minimum voltage present at the inverting input of the error amplifier when the dimmer conducting phase is set to maximum The power supply for error amplifier shown in Figure 4 is formed by use of an accurate reference voltage TL431 VCC Borne d C E BAS29 2 V20 2 7 R48 BC846B R54 4 7 10 1 1 1 1 C29 A4 10 uF 4 C37 10 uF g gov 63V 2 2 TL431ACD 2 R55 71613 2 10 L 1 I Fig 4 Power supply circuit for the error amplifier 4 3 Bleeder To be able to work with a large range of dimmers a bleeder circuit is included on the board to provide a load for the dimmer to reset the dimmer timer and provide latch current for the dimmer triac In Figure 5 the bleeder circuit diagram is shown The FET V28 operates as a current source T
15. 200 mA SOD80 High speed X1 X2 MKDS 2 5 Terminal block screw 2 p p 2e MKDS 2 5 08 2 5 mm X5 Header 3x2 Header dual straight gold p 2 54 6 72 DROW72 Lpin 5 80 strip72 Y1 Cover Fuse holder cover for 5 mm x 20 mm N A UM10321 1 NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 22 of 24 Semiconductors UM10321 10 Legal information 5511750 TRIAC dimmable LED driver 10 1 Definitions Draft The document is a draft version only The content is still under internal review and subject to formal approval which may result in modifications or additions NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information 10 2 Disclaimers General Information in this document is believed to be accurate and reliable However NXP Semiconductors does not give any representations or warranties expressed or implied as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information Right to make changes NXP Semiconductors reserves the right to make changes to information published in this document including without limitation specifications and product descriptions at any time and without notice This document supersedes and replaces all inform
16. 4 R47 10 I 100 nF 680 kQ 330nF 1 DNP D V18 15V UM10321 1 The dimmer signal is taken from the bridge rectifier Vbriage Transistor V17 will be conducting when a voltage on the mains is detected 50 V When the triac dimmer is not conducting transistor V17 will be off Via the opto coupler B3 the capacitor C27 will be charged when the triac is on When the dimmer is at 100 conducting capacitor C27 is fully charged and diode V24 is not conducting The resistive divider R57 R46 R45 and R47 will set the voltage level on the inverting input 4 of the error amplifier This voltage sets the maximum current When the dimmer is set to less than 100 conducting the voltage on C27 drops and V24 conducts therefore the voltage on C33 drops Resulting in a lower reference voltage for the current feedback loop There the V I curve of the diode V24 is of logarithmic nature the dimming curve will also be of logarithmic nature resulting in the desired gamma curve Diode V24 is chosen so that its forward voltage is low This prevents a too high offset voltage needed at the non inverting error amplifier input Also the diode temperature behavior can influence the reference voltage A low leakage Schottky type like the NXP BAS70 is therefore preferable The error amplifier is build with operational amplifier A3 It compares
17. 9 4 1124 1 had 5320 O T8220 O T6220 AC input 1A 2 N 12 Mis H n 2 3 018820 O 1820 ONL 11750 82 MKDS 2 5 2 5 08 2 15 Soo 18m ys O 10220 Tube O 10220 clip Yi yis O T0220_Tube 10220 cip O Sticker pcb name 12nc 35 2 y 1 BYW5G vs L8 18 900019420 2 1 152 2 T2 12 2 1 im LJ BYV29 500 3 BYV29 500 27uH amp hs 3 m C4 2M70 3 S green dent 2 e 7 xl S 430 43k0 a zaoo mei 1 BYW56 a 1 21 2 LAT our R51 gt 2M70 B Ee 082 2 508 17 1 E cl a p 3 R66 R72 scat gt ES pt 1 2 R52 V 2M70 R70 R73 o 82 E BAS29 ier oe 1 2 1 2 VGate 1 2 6 C10 1EAW 1EAW 279 1 RIT REO 100pF 630V Reo R81 E BAS29 i 2M70 2 70 R10 2 11 2 lt c12 688 40k0 0 vec Ri THEO vo FcPtiNeo 220pF 630V DNP 0E2 W x 7 cease L4 E E 4 al ie ae BAS29 a R54 R48 C13 220n 16V AKTO 1 2 ERE es bu voc R17 Di si R15 12k0 R8 R74 62 2 44 6 8 l c29 joeznw DNP al 3 zi EF 0 ei a i R18 R86 33E0 R9 2 8 156 4780 31 iseeoo01e4t0 3 C16 2 632 14 220 2 9 BAS29 E 3 R21 100 5 m R22 10 0 95
18. 91 820 Resistor 1 96 0 125 W 100 ppm RC12H 805 R92 2 Resistor 1 96 0 125 W 100 ppm RC12H R0805 T1 Coil PFC RM 10 custom made RM10 UM10321 1 NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 21 of 24 NXP Semiconductors UM10321 SSL1750 TRIAC dimmable LED driver Table 9 Bill of material 5511750 75 W mains dimmable board 230 V version continued Reference Manuf Value Description Pkg type T2 Transformer PQ 32 20 custom made PQ 3220 V2 GBU8K BRIDGE 800 V 8 A TH SIL BRIDGE V3 V5 NXP BYV29 500 Diode ultra fast 500 V 9A TO220AC V4 V33 BYW56 Diode avalanche 1000 V 2A SOD57 V35 V37 V8 V10 NXP BAS29 Diode 50 ns 90 V 250 mA SOT23 V14 V19 V22 V9 V13 FCP11N60 FET MOS N ch 650 V 11 A 0 32bE TO220 V15 NXP BZX84C24 Zener 24 V 250 mW 5 96 SOT23 Y9t Y9p Y9W V17 V20 NXP BC846B NPN Transistor 65 V 250 mW SOT23 V29 V38 smd 1Bp 1Bt V39 V40 V18 NXP BZX84C15 Zener 15 V 250 mW 5 SOT23 YA4t YAp YAW V24 NXP 570 Diode Schottky V 70 V V 410 mV SOT23 70 mA V27 NXP BZX84C3V3 Zener 3 3 250 mW 5 SOT23 z14 pB1 tB1 WB1 V28 STP5NK50Z FET N ch 500 V 4 4 A 1 22E TO220 zener protected V30 NXP BZX84C8V2 Zener 8 2 V 250 mW Z7t Z7p Z7W SOT23 V31 SIOV S07K275 Varistor disk 275 V d 9 p 5 mm Rdisc9mm V32 DNP V34 DNP V36 NXP PMLL4448 Diode low drop 75 V
19. UM10321 75 W SSL1750 triac dimmable 230 V mains LED driver Rev 01 25 September 2009 User manual Document information Info Content Keywords SSL 1750 PFC LED driver high power triac high power factor mains dimmable Abstract User manual for the SSL1750 230 V AC mains dimmable 75 W 1000 mA LED driver board founded by Philips NXP Semiconductors UM1 0321 SSL1750 TRIAC dimmable LED driver Revision history Rev Date Description 01 20090925 Initial release Contact information For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com UM10321 1 NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 2 of 24 NXP Semiconductors UM1 0321 5511750 TRIAC dimmable LED driver 1 Introduction This SSL 1750 board is a 75 W 1000 mA current regulated LED driver that is dimmable with standard mains triac dimmers The board is using the NXP SSL1750 switched mode power supply with integrated power factor correction PFC and flyback controller The circuitry for communication between both controllers is integrated and needs no adjustment The PFC output power is on time controlled for simplicity It is not necessary to sense the phase of the mains voltage The flyback output power is current mode controlled for good suppression of input voltage ripple The board is very efficient higher
20. ackage The PFC boost the rectified mains voltage to 380 V which is enough to have a excellent power factor up to 250 V AC input The PFC output power is on time controlled for simplicity It is not necessary to sense the phase of the mains voltage During low dimming levels the PFC will go into burst mode for higher efficiency The board act as a current source for the LED load The board can be used with and without a dimmer Without a dimmer the driver will supply 1000 mA of current With a dimmer the current depends on the phase cut angle of the dimmer The phase cut signal of a dimmer is converted into a reference voltage so that the phase cut signal determines the level of the output current The output current is analog regulated which means that no Pulse With Modulation PWM is used A simplified functional application diagram is shown in Figure 2 Besides the PFC and flyback a bleeder an output current regulation and a dimming phase angle detection circuit are shown The function of these circuits are explained in this chapter NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 5 of 24 NXP Semiconductors UM1 0321 5511750 TRIAC dimmable LED driver SSL1750T Vbridge filter gamma Fig2 Simplified functional application diagram UM10321 1 4 1 4 2 Output current regulation The output current is sensed with a 1 sense resistor and compare
21. ation supplied prior to the publication hereof UM10321 1 Suitability for use NXP Semiconductors products are not designed authorized or warranted to be suitable for use in medical military aircraft space or life support equipment nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury death or severe property or environmental damage NXP Semiconductors accepts no liability for inclusion and or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and or use is at the customer s own risk Applications Applications that are described herein for any of these products are for illustrative purposes only NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification Export control This document as well as the item s described herein may be subject to export control regulations Export might require a prior authorization from national authorities 10 3 Trademarks Notice All referenced brands product names service names and trademarks are the property of their respective owners NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 23 of 24 Semiconductors UM10321 11 Contents 5511750 TRIAC dimmable LED driver 1 1 1 3 1 3 2 4 1 4 2 4
22. d User manual Rev 01 25 September 2009 16 of 24 NXP Semiconductors UM1 0321 SSL1750 TRIAC dimmable LED driver 8 Transformer specification 8 1 PFC LB don SS a 1 Dimensions mm 2 Core Ferroxcube 1 or equivalent 3 Core material 3C94 44 or equivalent Al 315 mH Fig 15 PFC bobbin RM 10 12 pin vertical type Table 5 transformer winding specifications 230 V version No Pin Wire Turns Winding Ignition Width method Turns Start Finish N1 9 7 0 1 30 40 11 1 10 2 5 1 0 22 2 2 Center I2 1 10 mm S1 1 0 05t 10 mm 1 Center I3 1 10 mm Table 6 PFC transformer electrical characteristics 230 V version Pin Specification Remark Inductance 9 7 500 10 96 60 kHz 1 V Leakage inductance 9 7 N A UM10321 1 NXP 2009 All rights reserved User manual Rev 01 25 September 2009 17 of 24 NXP Semiconductors UM10321 8 2 Flyback SSL1750 TRIAC dimmable LED driver Flyback transformer schematic diagram Flyback winding specification Wire Turns 20 0 025t 10 mm 1 14 14 0 025t 10 mm 1 0 250 2 0 250 2 20 8 8 Winding method Center Center Center Center Center Center Center Center Insulation Ignition Width Turns 1 10 mm 1 10 mm 1 10 mm 1 10 mm 1 10 mm 2 10 mm Fig 16
23. d with a reference voltage When no dimmer is connected the reference voltage is such that a 1000 mA current will be supplied to the load on the output When a dimmer is connected the reference voltage will change and thus the current depending on the dimmer setting The Triac phase detection circuit will generate this reference voltage Triac phase detection circuit The triac phase detection circuit shown in Figure 3 detects the phase angle of the triac dimmer to be able to control the LED current by changing the reference voltage for the current regulation loop Also shown in Figure 3 is the feedback loop to the flyback controller A gamma curve is build in to have a linear perceived brightness response NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 6 of 24 Semiconductors UM10321 5511750 TRIAC dimmable LED driver Fig 3 FBCTRL 47 ko R30 Rsense VDC T R50 V22 B2 ve 2 4 2 LMV710 HCPL817 R76 1kQ 1200 58 Vref R37 10 10 Vbridge R39 1MQ R43 33 Triac phase detector 339 BAS29 42040 R40 e VCC a7 Ka 50V B3 R57 1MQ T C 2 3 VB3 MS R45 BYvi7 Bce4g 817 I4 4 EAS 470 E R42 C27 R46 V34 C33 C3
24. gram Transistor V39 will pull 7 to ground when the mains input voltage is below the lower trip level causing the Flyback to switch off The input voltage from the bridge rectifier is detected by V37 and C40 The circuit inhibits an hysteresis The hysteresis prevents the LED driver from oscillating The combination of R96 and R91 determines the lower trip level V36 R96 combined with R91 determines the higher trip level NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 9 of 24 NXP Semiconductors UM1 0321 SSL1750 TRIAC dimmable LED driver The lower trip level must be chosen in such a way that it corresponds with the level of the AC input voltage output of the dimmer just slightly above the point at which the PFC converter turns off The higher trip level must be chosen in such a way that the FBCTRL level is open just below the minimum AC input voltage so that the driver is able to switch on under all allowed mains conditions The levels can be calculated as shown in Equation 2 and Equation 3 1 Ro Rog rms mE e 2 low_rms 2 b Rog 1 Vi V V V V 3 high_rms n be Re be fw Roz Where Vpe 7 0 63 V Vg 0 56 V The board is set at Vio 165 V rms and Vhigh 185 V rms Due to voltage spikes from switching on the triac during dimming the actual point could differ in some cases Decreasing the value of capacitor C40 ma
25. he current through R65 depends on the gate voltage which is set by the zener diode threshold _ 82 45 Da zener thresho 112 1 eeaer Regs 33 The bleeder current will only flows when the bridge voltage is below the level set by R59 R102 R107 R61 and Vy of transistor V29 UM10321 1 NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 8 of 24 NXP Semiconductors UM1 0321 UM10321 1 5511750 TRIAC dimmable LED driver VBridge bleeder 28 5 5 507 R65 33 Q 1W Fig 5 Bleeder circuit diagram 4 4 Flyback shut down circuit At the lowest dimming settings the average input voltage is too low for the PFC to operate The PFC converter turns off and as a consequence the SSL1750 chip enters in the start up sequence This causes interruptions in the output current which are visible as flicker in the LED s Figure 6 shows the circuit used to switch off the flyback controller to prevent flickering dimming when the input voltage is too low Vbridge FBCTRL V36 E 4 R97 PMLL4448 V37 1k 1W BYW56 R90 1k 1W R91 R92 R93 820 2 kQ 1MO B v39 C40 BC846B 10pF 400V B v40 T BC846B E R96 2 2 KQ Fig 6 Flyback shutdown circuit dia
26. mmers are not tested with this board NXP 2009 All rights reserved User manual Rev 01 25 September 2009 12 of 24 UM10321 SSL1750 TRIAC dimmable LED driver NXP Semiconductors 5 4 1 Dimming curve Measurement data of the dimming curve as described in Section 4 2 is shown in Figure 8 1000 Output current mA 800 600 400 0 0 2 0 4 0 6 0 8 0 10 0 ton dimmer 50 Hz Fig 8 Dimming curve triac on time Ton ms versus output current 50 Hz system When the dimming level is getting below a certain point Ton 2 ms the input voltage seen by the board will be too low and the board will switch off the flyback NXP 2009 All rights reserved 13 of 24 UM10321_1 User manual Rev 01 25 September 2009 6002 1equie3des 2 0 1 V Vzeouwn 6002 9 dXN FA 1 2 Fuseholder 5x20 x F2 11
27. thout a dimmer the board can reach an efficiency of 85 with 230 V AC 10 96 while delivering 75 W of output power The efficiency of the board varies with the dimming level Measurements with 3 different dimmers showed efficiency from 55 at the lowest dimming position up to 85 at full power This includes the losses in the dimmer Harmonic currents The harmonic currents measured on the board are listed in Table 4 The harmonic currents for this board are below the limits of the Class C of IEC 61000 3 2 Table 4 Harmonic currents Harmonic Maximum permissible harmonic Measured Measured order percentage of fundamental current current A percentage 1 0 368 3 30 x PF 28 7 96 0 100 27 1 5 10 96 0 013 3 7 96 7 7 96 0 014 3 9 96 9 5 96 0 006 1 6 96 Remark Measurement conditions Vi 231 Vpac Pin 85 W 0 384 A pf 0 956 Imains Thase 14 9 ms Trigger 5 00 ms div Normal 500 kS 10MSisfEdge Negative Fig 7 Mains current 230 V version 5 4 Dimming The board has been optimized for triac based dimmers Several triac dimmers have been tested by NXP Semiconductors As different dimmers have different specifications the dimming performance of the reference board might vary based on the used dimmer Non triac dimmers like transistor dimmers or so called electronic dimmers are not tested with this board Remark Non triac dimmers like transistor dimmers or so called electronic di
28. y help to reduce this effect 4 5 Protections The board and IC have several protections In the following sections the main protections are mentioned For details on protections in the IC please see the data sheet of the SSL1750 IC 4 5 1 Output under voltage protection The output under voltage is detected by the Vio on the VCC pin When the VCC level falls below the Vih uvio level of 15 V 1 V the flyback will be switch off The VCC level depends on the output voltage Therefore the protection will kick in when the total forward voltage of the LED load is below Ns Naux X Vtn uvio y Where Ns is the number of secondary turns and Na is the number of auxiliary turns of the transformer Vout uvlo X Vis uylo 4 V x 15 52 5V 5 Y aniio x 14 49V 6 V 2 x 16 56V 7 Resulting in a minimum total forward voltage of the LED load to be 56 V UM10321_1 NXP B V 2009 All rights reserved User manual Rev 01 25 September 2009 10 of 24 NXP Semiconductors UM1 0321 4 5 2 4 5 3 4 5 4 SSL1750 TRIAC dimmable LED driver Output over voltage protection The output over voltage is detected by the FBAUX pin The FBAUX pin is connected via Rrgaux to the auxiliary winding Vout ovp N 4 1 vp FBAUX x Repaux Velamp FBAUX 8 aux y x 82K 0 7 88 6 9 V y 798 82K 07 82 57 10 aux N V B N 321 x 82K
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