UM10321 75 W SSL1750 triac dimmable 230 V mains LED driver
Contents
1. L Fig 11 PCB silk screen bottom side NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 15 of 24 NXP Semiconductors UM10321 UM10321_1 SSL1750 triac dimmable LED driver Fig 12 PCB layout top layer ISSL1750 Fig2. V V Doi zener th 8 2 4 5 112mA 1 Rs 33 The bleeder current will only flows when the bridge voltage Vpriage is below the level set by R59 R102 R107 R61 and Vege of transistor V29 UM10321_1 NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 8 of 24 NXP Semiconductors U M1 0321 UM10321_1 SSL1750 triac dimmable LED driver VBridge bleeder V28 STP5NK50Z R65 339 1 W 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 SI 4 R97 PMLL4448 V37 1k 1W BYW56 R90 1k 1W R91 R92 R93 820 kQ 2kQ 1MQ C B v39 C40 BC846B 10 pF c E 400 V B v40 if 9 L BC846B E R96 2 2 KQ Fig 6 Flyback shutdown circuit diagram Transistor V39 will pull FBCTRL to ground when the mains input voltage is below the lower trip level causing the flyback to switch off The in
3. please send an email to salesaddresses nxp com Date of release 9 October 2009 Document identifier UM10321_1
4. pitch 10 mm 20 CFILM10MMx5 305 V AC C3 3300 pF 1kV capacitor ceramic high voltage Class 2 CDISC Cd 10 nE 1 KV capacitor ceramic high voltage C6 68 uF 450 V capacitor electrolytic radial 450 V 85c 20 CPRAD C7 C31 22 uF 100 V capacitor electrolytic radial 8 mm x 11 5 mm p 3 5 mm CPRAD 105 C 0 68 ESR 20 C9 C20 C23 10 nF capacitor ceramic X7R 50 V 10 C0805 C10 100 pF 630 V capacitor ceramic COG 630 V 5 C1206 UM10321_1 NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 19 of 24 NXP Semiconductors UM10321 SSL1750 triac dimmable LED driver Table 9 Bill of material SSL1750 75 W mains dimmable board 230 V version continued Reference Value Description Pkg type C12 C16 220 pF 630V_ capacitor ceramic COG 630 V 5 C1206 C13 220 nF 16 V capacitor ceramic X7R 16 V 10 C0805 C14 C30 47 uF 50 V capacitor electrolytic radial 50 V esr 0 65 Q 105 C CPRAD 20 d 6 3 h 11 p2 5 C15 1 uF 50 V 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 nE 16 Y capacitor ceramic X7R 16 V 10 C0805 C27 C33 C38 100 nF capacitor ceramic X7R 50 V 10 C0805 C29 C37 10 uF 63 V capacitor electrolytic radial 63 V 20 5 mmx 11 mm x CPRAD 2mm C32 22 nF capacitor ceramic X7R 50 V 10 C0805 C35 470 nF capacitor MKP Class X2 pitch 22 mm X 5 mm 20 CFILM2
5. 13 PCB layout bottom layer NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 16 of 24 NXP Semiconductors UM1 0321 SSL1750 triac dimmable LED driver 8 Transformer specification 8 1 PFC g MIS N tye Y pea ae SS a ee a 1 Dimensions in mm 2 Core Ferroxcube RM 1 or equivalent 3 Core material 3C94 PC44 or equivalent Al 315 mH Fig 15 PFC bobbin RM 10 12 pin vertical type Table 5 PFC transformer winding specifications 230 V version No Pin Wire Turns Winding Ignition Width method Turns Start Finish N1 9 7 0 1 30 40 Center l1 1 10 mm N2 5 1 0 22 2 2 Center 12 1 10 mm S1 1 0 05t 10 mm 1 Center 13 1 10 mm Table 6 PFC transformer electrical characteristics 230 V version Pin Specification Remark Inductance 9 7 500 pH 10 60 kHz 1 V Leakage inductance 9 7 N A UM10321_1 NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 17 of 24 NXP Semiconductors UM10321 UM10321_1 8 2 Flyback SSL1750 triac dimmable LED driver Fig 16 Flyback transformer schematic diagram Table 7 Flyback winding specification No Pin Wire Turns Winding Insulation Start Finish method Ignition Width Turns N1 4 1 20 Center l1 1 10 mm S1 5 0 025t 10 mm 1 Center 12 1 10 mm N2 9 10 14 Center N3 11 12 14 Cen
6. 2 5mx 305 V AC 8 5 mm C39 1000 pF 440 V capacitor ceramic high voltage Y1 CDISC Y1 C40 10 uF 400 V capacitor electrolytic radial 10 mm x 20 mm x 5mm CPRAD 20 ED serie F1 fuse holder fuse holder for 5 mm x 20 mm FUSE_H_20x5 5x20 F2 1A fuse 5 mm x 20 mm time lag 5 mm x 20 mm L2 18 mH inductor choke common l 1 A R 640 mQ TH_CM_IND L5 60 0 inductor Solid Chip Ferrite HF smd L0603 at100 MHz L7 39 Q at inductor Solid Chip Ferrite HF smd L0805 100 MHz L8 27 uH inductor Choke I 1 6 A R 58 mQ LRAD5mm10 L9 2x 1 5 mH inductor choke CM I 2 A R 150 mQ L_CM TH L10 1 5 mH inductor Choke 850 mA R 580 mQ LRAD7 5mm20 R1 R2 R39 R47 1 MQ resistor 1 0 125 W 100 ppm RC12H R0805 R57 R59 R60 R93 R3 R51 R52 2 7 MQ resistor 1 0 125 W 100 ppm RC12H R0805 R80 R81 R4 R6 43 KQ resistor 1 0 125 W 100 ppm RC12H R0805 R8 62 KQ resistor 1 0 125 W 100 ppm RC12H R0805 R10 R33 R37 10 kQ resistor 1 0 125 W 100 ppm RC12H R0805 R42 R54 R55 R58 R61 R94 R11 R19 479 resistor 1 0 125 W 100 ppm RC12H R0805 R14 R18 R22 10 0 Q resistor 1 0 125 W 100 ppm RC12H R0805 R15 12 kQ resistor 1 0 125 W 100 ppm RC12H R0805 R17 R50 10 0 Q resistor 1 0 125 W 100 ppm RC12H R0805 R20 R21 R76 1 kQ resistor 1 0 125 W 100 ppm RC12H R0805 R87 R88 R95 UM10321_1 NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 20 of 24 UM10321 SSL1750 triac dimmable LED driver NXP
7. 846B p10 kA oy 100 nF tev MO g off 98 2 1 C BC846B ae 2 2 kO gD all E Fig 9 Circuit diagram of the 75 W mains dimmable LED driver board 230 V AC 50 HZ version penased siyBu IY 6002 Ad dXN vesOvl weibeip WNDU SIOJONPUODIWISS dXN LEEOLINN ABVALP GAT 9IQeuwip 26141 OSZL1SS NXP Semiconductors UM10321 SSL1750 triac dimmable LED driver 7 PCB silk screen and layout UM10321_1 A FZ GF MAA S5L1750 75W WWW NXP COM A Mains Dimmable LED Driver KL Fig 10 PCB silk screen top side ISSL1750
8. AC input connector X1 you can connect 230 V AC 10 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 9 October 2009 4 of 24 NXP Semiconductors U M1 0321 SSL1750 triac dimmable LED driver The total forward voltage Vf of the LED string should not exceed the maximum output voltage of the board see Section 4 5 2 A lower total Vr 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 Ve 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 The SSL1750 includes a PFC and a flyback controller integrated in one SO 16 package The PFC boost the rectifie
9. H SIL_BRIDGE V3 V5 NXP BYV29 500 diode ultra fast 500 V 9 A TO220AC V4 V33 V35 V37 BYW56 diode avalanche 1000 V 2A SOD57 V8 V10 V14 NXP BAS29 diode 50 ns 90 V 250 mA SOT23 V19 V22 V9 V13 FCP11N60 FET MOS N ch 650 V 11 A 0 32E TO220 V15 NXP BZX84C24 Zener 24 V 250 mW 5 Y9t Y9p YOW SOT23 V17 V20 V29 NXP BC846B NPN transistor 65 V 250 mW smd 1Bp 1Bt SOT23 V38 V39 V40 V18 NXP BZX84C15 Zener 15 V 250 mW 5 Y4t Y4p Y4W SOT23 V24 NXP BAS70 diode Schottky V 70 V Vr 410 mV l 70 mA SOT23 V27 NXP BZX84C3V3 diode Zener 3 3 V 250 mW 5 z14 pB1 tB1 WB1 SOT23 V28 STP5NK50Z FET N ch 500 V 4 4 A 1 22E zener protected TO220 V30 NXP BZX84C8V2 diode Zener 8 2 V 250 mW Z7t Z7p Z7W SOT23 UM10321_1 NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 21 of 24 NXP Semiconductors UM10321 SSL1750 triac dimmable LED driver Table 9 Bill of material SSL1750 75 W mains dimmable board 230 V version continued Reference Manuf Value Description Pkg type 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 200 mA High speed SOD80 X1 X2 MKDS 2 5 terminal block screw 2 p p 2e 2 5 mm2 MKDS 2 5 08 X5 header 3x2 header dual straight gold p 2 54 Lpin 5 80 strip72 6 72 DROW72 Y1 cover fuse holder cover for 5 mm x 20 mm N A UM10321_1 NXP B V 2009 All rights reserved User manual R
10. Semiconductors Table 9 Bill of material SSL1750 75 W mains dimmable board 230 V version continued Reference Manuf Value Description Pkg type R23 82 KQ resistor 1 0 125 W 100 ppm RC12H R0805 R24 5 1 KQ resistor 1 0 125 W 100 ppm RC12H R0805 R26 39 kQ resistor 1 0 125 W 100 ppm RC12H R0805 R27 560 kQ resistor 1 0 125 W 100 ppm RC12H R0805 R28 R43 33 KQ resistor 1 0 125 W 100 ppm RC12H R0805 R29 DNP R30 120 Q resistor 1 0 125 W 100 ppm RC12H R0805 R31 120 KQ resistor 1 0 125 W 100 ppm RC12H R0805 R40 R48 R56 4 7 KQ resistor 1 0 125 W 100 ppm RC12H R0805 R45 470 KQ resistor 1 0 125 W 100 ppm RC12H R0805 R46 680 kQ resistor 1 0 125 W 100 ppm RC12H R0805 R62 R82 R96 2 2 KQ resistor 1 0 125 W 100 ppm RC12H R0805 R63 R68 0 2 Q W resistor metal Strip 1 1 W R2512 R65 339 1W resistor Thick Film 1 1 W 200 V R2512 R66 R70 R72 19 1W resistor Thick Film 1 1 W 200 V R2512 R73 R67 DNP R71 R75 R77 00 resistor RO805 OE jumper R0805 R74 TBD R78 R79 R90 1kQ 1W resistor Thick Film 1 1 W R2512 R97 R83 R84 R85 3 3 kQ resistor 1 0 250 W 100 ppm RC02H R1206 R86 15 KQ resistor 1 0 125 W 100 ppm RC12H R0805 R89 100 KQ resistor 1 0 125 W 100 ppm RC12H R0805 R91 820 kQ resistor 1 0 125 W 100 ppm RC12H R0805 R92 2 kQ resistor 1 0 125 W 100 ppm RC12H R0805 Ti coil PFC RM 10 custom made RM10 T2 transformer PQ 32 20 custom made PQ 3220 V2 GBU8K bridge 800 V 8 AT
11. UM10321 75 W SSL1750 triac dimmable 230 V mains LED driver Rev 01 9 October 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 U M1 0321 SSL1750 triac dimmable LED driver Revision history Rev Date Description 01 20091009 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 9 October 2009 2 of 24 NXP Semiconductors U M1 0321 SSL1750 triac dimmable LED driver 1 Introduction 1 1 UM10321_1 This SSL1750 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 eff
12. ails on protections in the IC please see the data sheet of the SSL1750 IC Output under voltage protection The output under voltage is detected by the VinuvLo on the VCC pin When the VCC level falls below the Vin 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 Vth UvLo Where Ns is the number of secondary turns and N aux is the number of auxiliary turns of the transformer VauvLo a x Vih UVLO 4 Vw an x 15 52 5V typ 5 Vi uvLo z x 14 49V min 6 VauvLo z x 16 56V max 7 Resulting in a minimum total forward voltage of the LED load to be 56 V NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 10 of 24 NXP Semiconductors U M1 0321 SSL1750 triac dimmable LED driver 4 5 2 Output over voltage protection The output Over Voltage Protection OVP is provided by detecting the output voltage by the FBAUX pin The FBAUX pin is connected via Rfgaux to the auxiliary winding Vote openu x Repaux T Vclamp FBAUX 8 Vii FGO x 82K 0 7 88 6V typ 9 Voi Sra x 82K 0 7 82 5V min 10 Vea 321 p x 82K 0 7 94 6V max 11 aux Where N is the number of secondary turns and Nay is the number of auxiliary turns of the transformer The value of Regayx can be adjusted to the turns ratio of the tra
13. aries 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 5 3 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 0 100 27 1 5 10 0 013 3 7 7 7 0 014 3 9 9 5 0 006 1 6 Remark Measurement conditions Vi 231 Vpac P 85 W I 0 384 A pf 0 956 Imains ca a trae Thase 14 9 7 Naa 5 00 msidivj 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 dimmers have not been tested with this board NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 12 of 24 UM10321 SSL1750 triac dimmable LED driver NXP Sem
14. d 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 9 October 2009 5 of 24 NXP Semiconductors UM1 0321 SSL1750 triac dimmable LED driver SSL1750T rt Vbridge filter gamma Vbridge Fig 2 Simplified functional application diagram 4 1 Output current regulation The output current is sensed with a 1 sense resistor and compared with a reference voltage When no dimmer is c
15. description ss e x e x x x e x 5 Output current regulation 6 Triac phase detection circuit 6 Bleeder cee eee eee 8 Flyback shut down circuit 9 Protections sestiere io ep 97 R Ra A nee AE 10 Output under voltage protection 10 Output over voltage protection 11 PFC bus voltage protection 11 Temperature protection 11 Measurements e x e x x x eee eens 11 Power Factor Correction PFC 11 EfIGIGNCY 22452 bade eedi cede T ZR ao 2 12 Harmonic currents 2 00 12 DIMMING Sie bee ea Reda Ba an ee 13 Dimming curve 0 2 e eee eee 13 Circuit diagram 0 0e eee eee eee 14 PCB silk screen and layout 15 Transformer specification 17 PFC lt ad teehee AR ene Re bn 17 Flyback sec secs cae Gow T eid bea ihe 18 Bill Of Materials BOM 19 Legal information sss e x e x e x eee eee 23 DetINNIONS 0 2 979 RRR ae eek teehee ee 23 Disclaimers wc K RR RKR T 9 vini Deret ees 23 Trademarks cee eee eee 23 Contents oeio sae e20 ses eevee eta ce need 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
16. easonably 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 9 October 2009 23 of 24 NXP Semiconductors UM10321 11 Contents SSL1750 triac dimmable LED driver 1 1 3 1 3 2 4 1 4 2 4 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 sss e s x x e 0c cece eee 3 IC description eee 3 Specification 24 5 0056 0 8 R 8 ence eens 4 Board connections ss s x e x eee e e d NPU serine SRTR eE a AAR i 4 OUUTE E ede E 4 Functional
17. etector UM10321_1 The dimmer signal is taken from the bridge rectifier Vpridge Transistor V17 will be conducting when a voltage on the mains is detected gt 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 pin 4 of the error amplifier A3 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 BAS70O is therefore preferable The error amplifier is build with operational amplifier A3 It compares the input sense voltage measured across the sense resist
18. ev 01 9 October 2009 22 of 24 NXP Semiconductors UM10321 10 Legal information SSL1750 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 information 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 a NXP Semiconductors product can r
19. icient higher than 85 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 IC description The SSL1750 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 li
20. iconductors 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 B V 2009 All rights reserved 13 of 24 UM10321_1 User manual Rev 01 9 October 2009 L LZEOLNN jenuew Jasp 6002 49909190 6 L0 A8Y 1 Fi 2 Fuseholder 5 x 20 7 OY Ow x1 19 4 W 1124 i i 1 Y1 F2 TO220_clp TO220_clip AC input Daar n Kag n sense ag e bY ve Ovi7 2 vai IA aE 2p 13 T0220_clip Heatsink TO220 MKDS 2 5 2 5 08
21. mits the peak current to 25 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 SSL1750 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 componenis NXP B V 2009 All rights reserved User manual Rev 01 9 October 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 230V 10 DC Output current 1000 mA 10 When not dimmed Output Power 75W10 When not dimmed DC Output Voltage 56 V to 82 V Depending on LED forward voltage Dimming range 100 mA to 1000 mA Depending on dimmer Driver Efficiency gt 85 Over whole input voltage range With 75 W load and no dimming Power Factor gt 0 95 For 230 V AC 10 mains and no dimmer used Fig 1 Photo of the dimmable 75 W LED driver board 3 Board connections UM10321_1 3 1 3 2 Input On the
22. nsformer thus making an accurate OVP detection possible To restart after an over voltage event interrupt the mains to reset the internal latch 4 5 3 PFC bus voltage protection In case of an over voltage on the PFC bus the PFC controller will stop operating 4 5 4 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 Negativice Temperature Coefficent NTC device 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 3 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 B V 2009 All rights reserved User manual Rev 01 9 October 2009 11 of 24 NXP Semiconductors UM1 0321 UM10321_1 SSL1750 triac dimmable LED driver 5 2 Efficiency Without a dimmer the board can reach an efficiency of 85 with 230 V AC 10 while delivering 75 W of output power The efficiency of the board v
23. onnected 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 4 2 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 UM10321_1 NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 6 of 24 NXP Semiconductors UM10321 SSL1750 triac dimmable LED driver Fig 3 VCC a R56 4 7 kQ R30 aa A3 v Rsense 5 VB2 1 qe 120 Q FBCTRL 2 2 4 R58 Vref LMV710 v ne 10 kO 39 ko HCPL817 R76 C19 330 nF c20 1 kQ E 10 nF C32 R37 10 kO VDC 22 nF T R50 V22 339 BAS29 VCC C30 r BII Vbridge 50V 7 B3 R39 1 4 R57 1MoQ 1 MQ gt V24 R45 c 2 3 VB3 4 pd Bevy HCPL817 BAS70 470 kQ BC846 7 E R42 c27 R46 v34 C33 C34 R47 R43 v18 10 kQ 100 nF 680 kO DNP 100 nF 330 nF 1 MQ 33 kQ 15V 16V Triac phase d
24. ors R66 R70 R72 R73 with the reference voltage An opto coupler is directly connected to the flyback control input FBCTRL to control the flyback frequency and mode NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 7 of 24 NXP Semiconductors UM1 0321 SSL1750 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 A3 shown in Figure 4 is formed by use of an accurate reference voltage TL431 VCC TE c E BAS29 2 5 van 2 ae 7 R48 BC846B R54 4 7 KQ 10 kQ 1 1 1 1 C29 C37 A4 10 uE tour g Bay 63V 2 2 TL431ACD 9 R55 71613 l2 10 kQ L 1 T ba 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 The current Ibleeder through R65 depends on the gate voltage which is set by the zener diode
25. put 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 and R96 in parallel combined with R91 determines the higher trip level NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 9 of 24 NXP Semiconductors UM1 0321 UM10321_1 4 5 4 5 1 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 Viow RMS B x Var Ros 2 1 Ro Ro Vhigh RMs Ur i Rog TLS Vr Ro 2 Vee 3 Where Vee 0 63 V Ve 0 56 V The board is set at Viow 165 V RMS and Vpigh 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 may help to reduce this effect Protections The board and IC have several protections In the following sections the main protections are mentioned For det
26. sigy so7k275 A 2x 1 5 mH Be 18 mH Ove Om yp Ma 70220 clip __pcb_SSL1750 R2A Oyio Y15 70220_clip Sticker pcb name 12nc S v35 v33 ay BYW56 Lio va v5 Ls bd 172 BYES 2y4 2T Reyi 172 N c Hz LJ isEa0001g420 PNS BYV29 500 anm S nra S lt 100MHz Gel 3300pF 2 PE 1 gt PA aes 1kQ 1W G E ka 68 pF Br 3177 a ON l 1 asova wy R BQ feet 22uF asu E 12 wo a S GL ZS BYW56 3H 10 100 V 9l 100 VY baie S E S se N pas MKDS 2 5 2 5 08 305 Vac 305 Vac Gil 7 3 3kQ wes 10rF 39 Q at 100 MHz oy ie a 1 3 9 vio DNP iy Vgate BAS29 a lt 7 1 2 G EaU Neo F 290 pF R80 S Rioga O SPINS lt l 27M2 Rio E E toKa vig crs l 2 y L BAS29 220 nF 16V 12 R15 12 kO co s 10 nP C37 10 uF S ev A5 1P21 1k2 2 PFOSENSE R22 100 1 2 PFCDRIVER 3 ia pa 1 2 PFCAUX io Ear e wool ar R24 5 1 kQ s PFCCOMP 5 i Se Set uF o AV 50V 50V R23 1 R27 2 1 R87 2 VINSENSE 7 15 saa 560 kO TKQ 14 Toa 7 5 vec x5 A 150 nF a 1 2J 16V v S 2 4 B2 4 vB2 1078 2 1 4 4 Vgate SI SSL1750T aD z 2 TR 7 Rsense v27 R31 header 3 x 2 cg paren a ass HOPL817 alo 470 nF Ta c32 l N 12 Y5 d gong 10kQ aS A Aiel Rog e R99 5 4R100 vec T 330 kQ 1KQAW fe pao aie heatsink a 7 SSL1750 330kQ 3300 4790 5 s gt R40 R102 R104 R93 R39 47kQ 330 KQ TKW 270kQ 330 kQ 330 kQ a E B3 i v36 R107 v28 S 2 2 La 1 4 ji 0990 STP5NK50Z a Mopar P a7 aint Br a cao 7 Mus R2 027 l S R47 al R65 104F 400V 7 al BC
27. ter 13 1 10 mm S2 5 0 025t 10 mm 1 Center 14 7 S S 7 1 10 mm N4 2 4 20 Center I5 1 10 mm N5 5 6 0 250 2 8 Center NG 7 8 0 250 2 8 Center l6 2 10 mm 1 Pin 3 cut off 2 N2 N3 and N6 and N6 use triple insulated wire 3 Use maximum diameter or parallel wires for maximal fill NXP B V 2009 All rights reserved User manual Rev 01 9 October 2009 18 of 24 NXP Semiconductors UM10321 SSL1750 triac dimmable LED driver Table 8 amp Electrical characteristics Pin Specification Remark Inductance 1 2 650 uH 10 60 kHz 1 V Leakage inductance 1 2 lt 5 uH 2nd all short Flyback core and bobbin Core PQ 3220 Core material 3C94 PC44 or equivalent Al 400 nH kd 32 15 max gt a e 26 7 max gt 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 SS RR i o SOT23 5 3 mVos A48A A4 TL431ACD voltage reference programmable shunt 2 5 V to 36 V SO8 SO8 A5 NXP SSL1750T SMPS control IC for LED drivers SO16 B1 green LED 3 mm green diffused tinted 6 mcd at 10 mA LED3_V B2 B3 HCPL817 opto coupler single OC 5000 V CTR 50 600 DIP4W C2 C5 47 nF capacitor MKP Class X2
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