UM10795 - NXP Semiconductors
Contents
1. Q2 transistor 500 V NPN PMBT45 NXP Semiconductors R1 R2 R7 resistor 100 kQ 1 96 250 mW 1206 R8 R3 resistor 220 O 1 96 125 mW 0805 R4 R44 resistor 2 7 Q MCFRFTDV2R70 Multicomp R5 resistor 470 Q 1 96 63 mW 0603 R6 resistor 5 1 kO 1 96 63 mW 0603 R9 resistor 82 kQ 1 956 250 mW 1206 R10 resistor 1 Q 1 956 250 mW 1206 R11 R12 resistor 750 kQ 1 96 250 mW 1206 R13 resistor 620 kO 1 96 63 mW 0603 E R45 resistor 10 Q 10 96 2 W EMC EMC2 10RK Welwyn Components R47 resistor 51 KQ 1 96 63 mW 0603 RV1 resistor VDR 275 V 63 J VDRS10P275BSE Bourns U1 IC SSL5031BTS HSO8 SSL5031BTS NXP Semiconductors UM10795 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 14 of 18 NXP Semiconductors U M1 0795 SSL5031BDB1209 18 W TLED buck LED driver demo board 10 Board layout E ON G ow fel a 6 aaa 014901 a Top view aaa 014902 b Bottom view Fig 13 SSL5031BDB1209 demo board layout UM10795 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 15 of 18 NXP Semiconductors U M1 0795 SSL5031BDB1209 18 W TLED buck LED driver demo board 11 Abbreviations Table 3 Abbreviations Acronym Descript2. high mains voltage low the power losses in these resistors are divided over resistors R1 and R2 while R10 0 Q For universal mains the start up supply resistors must be set up to start the IC at 90 V AC This setup causes much unnecessary dissipation and efficiency loss at 230 V AC To avoid the extra loss at high mains an optional circuit is used see Figure 5 The efficiency improvement from this circuit is 3 to 5 at 230 V AC Transistor Q2 is set up as a current limited voltage source The current limited voltage source is turned off using diode D4 and kept in off state using capacitor C8 when the SSL5031BTS starts switching The supply for the IC during switching is coming from the recovered turn off charge in Q1 which charges capacitor C3 Resistor R11 limits the current in Q2 Diode D4 and the internal diode in the SSL5031BTS between the SW and VCC pins set the reference voltage The maximum current is limited to oe 255 uA the total start up current required for the SSL5031BTS to start To achieve flicker suppression at low mains voltages a voltage control of Q1 is implemented using the voltage divider R11 R12 and R13 The divider is set up to start the SSL5031BTS at 70 V AC mains when capacitors C6 and C7 are fully discharged If the circuit is turned on just after it has been switched off the AC mains start up voltage is higher The start up voltage can shift up to 95 V AC because of the precharge in capacitors
3. 9AUp G37 49NG AJIL M 8L 60018081808 1SS S6ZOLINN SJ0jonpuoolul8S dXN NXP Semiconductors UM10795 SSL5031BDB1209 18 W TLED buck LED driver demo board 9 Bill Of Materials BOM Table 2 SSL5031BDB1209 bill of materials Reference Description and values Part number Manufacturer BD1 bridge rectifier 600 V 0 8 A B6S G Comchip Tech C1 capacitor 0 1 uF 450 V CL21 450V 0 1pF K ZhongShan AIDI Electronics C2 capacitor 0 15 uF 450 V CL21 450V 0 15uF K ZhongShan AIDI Electronics C3 capacitor 1 uF 50 V X7R 0805 UMK212B7105KG T Taiyo Yuden C4 capacitor 0 22 uF 10 96 50 V X7R UMK107B7224KA TR Taiyo Yuden 0603 C6 C7 capacitor 120 uF 100 V 100ZLJ120M10X25 Rubycon C8 capacitor 47 nF 10 96 50 V X7R 0603 C0603C473K5RACTU KEMET C9 capacitor 100 nF 10 96 450 V CL21 450V 0 1pF K ZhongShan AIDI Electronics D1 diode 100 V 300 mA 1N4148W 7 F Diode Inc D2 diode fast 600 V 1A MURS160 E3 52T Vishay D3 diode TVS 15 V 5 A PESD15VL1BA NXP Semiconductors D5 diode Zener 13 V 250 mA BZX384 C13 NXP Semiconductors F1 fuse 250 V AC 1 A 2410 MF2410F1 000TM AEM K1 terminal block 2p 5 08 mm 1508060000 Weidm ller K2 terminal block 2p 5 08 mm 20020109 H021A01LF FCI L1 inductor 3300 uH SDR1006 332KL Bourns L2 inductor 680 uH MSS1210 6824KLB Coilcraft Q1 MOSFET N 650 V 1 8A SPDO2N60C3 Infineon
4. C6 and C7 Generally there is n 2 5 V left in output capacitors just after the circuit is switched off where n 2 number of single LEDs in series in an LED string To switch off the optional circuit remove resistor R11 and resistor R10 must be 0 O To protect Q2 from mains surges resistors R1 and R2 are left in place Replace resistor R10 with a 2 2 nF capacitor A small efficiency penalty for the surge protection of Q2 exists All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 6 of 18 NXP Semiconductors U M1 0795 UM10795 6 3 6 4 SSL5031BDB1209 18 W TLED buck LED driver demo board Q2 PMBTA44 D4 R10 sw S HARI BZX384 C13 1 1 nem Vv optional circuit to improve efficiency for universal mains when not used R10 00 aaa 014883 Fig 5 SSL5031BTS efficiency improvement circuit THD and LED voltage Because this application is a universal mains application the output LED voltage chosen is important If the chosen value is too low THD at high voltage is too high If it is too high THD at low mains voltage is too high To obtain equal distribution of the THD the optimum LED voltage for the universal mains application is 55 V to 60 V see Figure 8 Open load protection The driver board is protected when the LED load is acc
5. EEE UM10795 PEER SSL5031BDB1209 18 W TLED universal mains non isolated buck LED driver demo board Rev 1 4 November 2014 User manual Document information Info Content Keywords SSL5031BDB1209 SSL5031BTS LED driver non isolated buck topology T8 applications HSO8 package Abstract This user manual describes the performance technical data and the connection of the SSL5031BDB1209 demo board using a non isolated buck topology The SSL5031BTS is an NXP Semiconductors driver IC in a TSOP6 package intended to provide a low cost small form factor LED driver design The SSL5031BDB1209 demo board is designed for T8 applications It is intended to operate at 230 V AC with an output voltage around 60 V NXP Semiconductors UM10795 Revision history SSL5031BDB1209 18 W TLED buck LED driver demo board Rev Date Description v 1 20141104 first issue Contact information For more information please visit http www nxp com For sales office addresses please send an email to salesaddresses nxp com UM10795 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 2 of 18 NXP Semiconductors U M1 0795 1 Introduction SSL5031BDB1209 18 W TLED buck LED driver demo board WARNING A A Lethal voltage and fi
6. V AC input Compliant with IEC61000 3 2 harmonic standard Compliant with EN55015 conducted EMI All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 3 of 18 NXP Semiconductors UM10795 2 Safety warning SSL5031BDB1209 18 W TLED buck LED driver demo board The demo board input is connected to the 230 V mains Avoid touching the board while it is connected to the mains voltage and when it is in operation An isolated housing is obligatory when used in uncontrolled non laboratory environments Galvanic isolation from the mains phase using a fixed or variable transformer is always recommended Figure 1 shows the symbols on how to recognize these devices a Isolated Fig 1 019aab173 Isolation symbols 019aab174 b Not isolated 3 Specifications Table 1 lists the specification of the SSL5031BDB1209 demo board Table 1 SSL5031BDB1209 specifications Symbol Parameter Value V mains AC mains supply voltage 100 V to 240 V AC 10 Pout output power 16 1 W VLED output voltage 50 V to 65 V 55 V optimum lLED output current 297 mA lripple output current ripple at 100 Hz 15 peak to peak Ali Ep vmainsy lLED nom line regulation 1 5 96 Vmains 90 V to 264 V Ali Ep vLEDY ILED nom load regulation 0 7 96 Vigp 10 96 n effici
7. alue gt 18 kQ for resistor R6 If the value of resistor R6 is increased too much the DEMOVP pin can cause false OVP triggering Sense resistors To optimally profit from the excellent current stability of the SSL5031BTS overtemperature 50 ppm MELF type resistors are preferred to sense the LED current The output current stability drops to 3 compared to 7 96 over the full temperature range for normal 200 ppm 1206 type resistors When the sense resistor is operating at high temperatures its power rating must be rated by a factor 2 To keep the temperature at high power low 80 C when the board is operating at room temperature level a 1 W power resistor is used All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 9 of 18 NXP Semiconductors U M1 0795 SSL5031BDB1209 18 W TLED buck LED driver demo board 7 Performance 7 1 Efficiency aaa 014886 92 Efficiency 90 8 89 6 88 4 87 2 86 80 120 160 200 240 280 Vmains V AC Fig 6 Efficiency as a function of mains voltage 7 2 Power factor 0 99 aaa 014887 PF 0 97 0 96 0 94 0 93 0 91 80 120 160 200 240 280 Vmains V AC Fig 7 Power factor as a
8. e cR TE Rhe ude aed 10 Power factor 2000 eee eeeee 10 Total harmonic distortion 11 Line regulation llle 11 Load regulation llle eese 12 ElectroMagnetic Interference EMI 12 Schematic 2 22 er eR 13 Bill Of Materials BOM 14 Board layout 00 e eee eee eee 15 Abbreviations 000 eee eee eee 16 References 00 c cece eee e eee ees 16 Legal information LLL 17 Definitions 2a he RR ER 17 DisclaimerS 00 0200 cee eee eee 17 Trademarks 0000200 cee ee eeeee 17 Contents ccce oon cree cen e 18 Please be aware that important notices concerning this document and the product s described herein have been included in section Legal information NXP Semiconductors N V 2014 All rights reserved For more information please visit http Awww nxp com For sales office addresses please send an email to salesaddresses nxp com Date of release 4 November 2014 Document identifier UM10795
9. e of NXP Semiconductors In no event shall NXP Semiconductors be liable for any indirect incidental punitive special or consequential damages including without limitation lost profits lost savings business interruption costs related to the removal or replacement of any products or rework charges whether or not such damages are based on tort including negligence warranty breach of contract or any other legal theory Notwithstanding any damages that customer might incur for any reason whatsoever NXP Semiconductors aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the Terms and conditions of commercial sale of NXP Semiconductors 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 Suitability for use NXP Semiconductors products are not designed authorized or warranted to be suitable for use in life support life critical or safety critical systems or 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 and its suppliers accept no
10. ency 88 96 90 V to 264 V AC 50 Hz 60 Hz PF power factor 20 92 100 V to 264 V AC 50 Hz 60 Hz THD total harmonic distortion lt 20 96 90 V to 264 V AC 50 Hz 60 Hz Toper operating temperature 40 C to 85 C board dimensions 180 mm x 15mm conducted electrostatic Interference EMI EN55015 IEC61000 3 2 Class D for Pin lt 25 W limit UM10795 All information provided in this document is subject to legal disclaimers Rev 1 4 November 2014 NXP Semiconductors N V 2014 All rights reserved 4 of 18 User manual NXP Semiconductors U M1 0795 SSL5031BDB1209 18 W TLED buck LED driver demo board Figure 2 shows the dimensions of the demo board aaa 014881 Fig 2 SSL5031BDB1209 demo board dimensions 4 Board photographs aaa 014879 aaa 014880 b Bottom view Fig 3 SSL5031BDB1209 demo board photographs 5 Board connections The SSL5031BDB1209 demo board is optimized for a 100 V to 264 V AC 50 Hz to 60 Hz mains supply It is designed to work with multiple LEDs or an LED module Under the expected conditions the output current is 297 mA when using an LED string with a 55 V forward voltage Vr The current can be adjusted using resistors R4 and R44 A 55 V LED voltage gives a good THD performance at 120 V AC and 230 V AC A lower LED voltage gives better THD at 120 V AC A higher LED voltage does bett
11. er for the higher mains voltage W1 and W2 are the connections for the mains voltage J1 _ED and J2 LED are the connections for the LED load Figure 4 shows the connections wv output mains in VLED 55V 90 260 Vac ILEp 297 mA aaa 014882 Fig 4 SSL5031BDB1209 board connections UM10795 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 5 of 18 NXP Semiconductors U M1 0795 SSL5031BDB1209 18 W TLED buck LED driver demo board 6 Functional description 6 1 6 2 UM10795 Input filtering Capacitors C1 and C2 and inductor L1 filter the switching current from the buck converter to the line Capacitors C1 and C2 also provide a low impedance path for the switching current To achieve high frequency suppression to the mains a high PF and low THD in the design the values of capacitors C1 and C2 are kept as low as necessary The 10 Q input series resistance together with the varistor MOV1 across the AC bridge rectifier input provides protection against transient surge voltages The input resistance is added to increase the immunity to the line surge see Figure 12 Do not omit this resistor or lower its value Efficiency improvement for universal mains For single mains the SSL5031BTS is normally supplied using start up resistors R1 R2 and R10 To keep the temperature at
12. f such damages Notwithstanding any damages that customer might incur for any reason whatsoever including without limitation all damages referenced above and all direct or general damages the entire liability of NXP Semiconductors its affiliates and their suppliers and customer s exclusive remedy for all of the foregoing shall be limited to actual damages incurred by customer based on reasonable reliance up to the greater of the amount actually paid by customer for the product or five dollars US 5 00 The foregoing limitations exclusions and disclaimers shall apply to the maximum extent permitted by applicable law even if any remedy fails of its essential purpose Safety of high voltage evaluation products The non insulated high voltages that are present when operating this product constitute a risk of electric shock personal injury death and or ignition of fire This product is intended for evaluation purposes only It shall be operated in a designated test area by personnel that is qualified according to local requirements and labor laws to work with non insulated mains voltages and high voltage circuits The product does not comply with IEC 60950 based national or regional safety standards NXP Semiconductors does not accept any liability for damages incurred due to inappropriate use of this product or related to non insulated high voltages Any use of this product is at customer s own risk and liability The customer shall fully
13. function of mains voltage UM10795 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 10 of 18 NXP Semiconductors U M1 0795 SSL5031BDB1209 18 W TLED buck LED driver demo board 7 3 Total harmonic distortion aaa 014896 28 THD 96 25 2 224 14 80 120 160 200 240 280 Vmains V AC Fig 8 Total harmonic distortion as a function of mains voltage 7 4 Line regulation 300 aaa 014897 ILED mA arp nce P c ee 275 250 225 200 175 150 80 120 160 200 240 280 Mains in ac V Fig 9 Output LED current as a function of mains voltage UM10795 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 11 of 18 NXP Semiconductors U M1 0795 SSL5031BDB1209 18 W TLED buck LED driver demo board 7 5 Load regulation 290 aaa 014898 ED Current Sy mA N 266 242 1 218 y 194 y Y t 170 43 47 4 51 8 56 2 60 6 65 LED Voltage V 1 Vmains 230 V AC 2 Vmains 90 V AC Fig 10 LED curre
14. he customer s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer s third party customer s NXP does not accept any liability in this respect 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 competent authorities Evaluation products This product is provided on an as is and with all faults basis for evaluation purposes only NXP Semiconductors its affiliates and their suppliers expressly disclaim all warranties whether express implied or statutory including but not limited to the implied warranties of non infringement merchantability and fitness for a particular purpose The entire risk as to the quality or arising out of the use or performance of this product remains with customer In no event shall NXP Semiconductors its affiliates or their suppliers be liable to customer for any special indirect consequential punitive or incidental damages including without limitation damages for loss of business business interruption loss of use loss of data or information and the like arising out the use of or inability to use the product whether or not based on tort including negligence strict liability breach of contract breach of warranty or any other theory even if advised of the possibility o
15. identally left open The open load protection is a non latched protection Two circuits set the open load output voltage One circuit sets the open load output voltage when the IC does not operate because of a defect The other circuit sets it when the IC is operating normally In all cases the output voltage must never exceed the rated DC voltage of the output capacitor Do not reconnect the LEDs directly after an open load situation The output capacitor is charged to a higher voltage than the total LED voltage which forces an uncontrolled discharge current through the LEDs when connected It can damage the LEDs permanently IC not operating The voltage divider consisting of R1 R2 and R10 sets the output voltage in the VCC pin of the IC referenced to the GND pin of the IC and resistor R9 LV prata 15 R9 Vout m 1 RI R2 RO RIO If the optional circuit see Figure 5 is used the current set by PT and the parallel current path set by resistors R11 R12 and R13 and diode D4 set the output voltage at 260 V AC the total current is about 285 uA All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 7 of 18 NXP Semiconductors U M1 0795 SSL5031BDB1209 18 W TLED buck LED driver demo board As a rule of thumb limit resistor R9 to E UE In this way the voltage is not sufficient to illumina
16. indemnify and hold harmless NXP Semiconductors from any liability damages and claims resulting from the use of the product Translations A non English translated version of a document is for reference only The English version shall prevail in case of any discrepancy between the translated and English versions 13 3 Trademarks Notice All referenced brands product names service names and trademarks are the property of their respective owners GreenChip is a trademark of NXP Semiconductors N V NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 17 of 18 NXP Semiconductors UM10795 SSL5031BDB1209 18 W TLED buck LED driver demo board 14 Contents 6 6 7 1 7 2 7 3 7 4 7 5 7 6 10 11 12 13 13 1 13 2 13 3 14 Introduction lesen 3 Features e a eee 3 Safety warning 0 cece eee eee 4 Specifications 0 00 e eee eee eee 4 Board photographs 5 Board connections Ls 5 Functional description 6 Input filtering ede E mRieERR ears 6 Efficiency improvement for universal mains 6 THD and LED voltage 7 Open load protection 7 External overtemperature protection and LED current foldback 000 eee ee eee 9 Sense resistOrs 6 2 2 eee 9 Performance 2 0 0 cece eee eee 10 EMMIGION CY iu
17. ion EMI ElectroMagnetic Interference LED Light Emitting Diode OCP OverCurrent Protection OTP OverTemperature Protection PF Power Factor SSL Solid State Lighting 12 References 1 SSL5031BTS data sheet Compact high power factor low THD buck LED driver IC UM10795 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 16 of 18 NXP Semiconductors UM10795 SSL5031BDB1209 18 W TLED buck LED driver demo board 13 Legal information 13 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 13 2 Disclaimers Limited warranty and liability 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 NXP Semiconductors takes no responsibility for the content in this document if provided by an information source outsid
18. 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 Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products and NXP Semiconductors accepts no liability for any assistance with applications or customer product design It is customer s sole responsibility to determine whether the NXP Semiconductors product is suitable and fit for the customer s applications and products planned as well as for the planned application and use of customer s third party customer s Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products UM10795 All information provided in this document is subject to legal disclaimers NXP Semiconductors does not accept any liability related to any default damage costs or problem which is based on any weakness or default in the customer s applications or products or the application or use by customer s third party customer s Customer is responsible for doing all necessary testing for t
19. nt as a function of LED voltage 7 6 ElectroMagnetic Interference EMI Figure 11 shows the conducted EMI result of the SSL5031BDB1209 demo board RBW 120 kHz Marker 1 T3 MT 100 ms 53 33 dByV Att 10 dB PREAMP OFF 000000000 kHr 9 kHz 30 MHz aaa 014899 Fig 11 EMI performance UM10795 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 12 of 18 jenuew 49s v LOZ JeqUI9AON t L 9H sieuirejosip Jea oj joe qns si jueuunoop siui ui pepi oid uoneuuojul Iv 8L JO I S6ZOLWN pamasa Syu Iv P LOZ AN S1O ONPUDDIWES dXN 8 Schematic K1 D3 PESD15VL1BA L1 drain U1 MB6S E3 45 Q2 C2 150 nF 450 V R2 100 kO R1 100 kQ 1N4148W PMBTA44 D5 BZX384 C13 optional circuit to improve efficiency for universal mains sw p R12 750 kQ R10 10 e y 9v Q1 SPDO2N60C3 R5 external PTC 0 Q when not mounted DEMOVP 4 Fig 12 SSL5031BDB1209 demo board schematic C6 C9 120 pF 100 nF K 100 V 450 V 1 C7 4 2 RQ we em um CONN GND float D2 MURS160 aaa 014900 pieog ow p J1
20. re ignition hazard The non insulated high voltages that are present when operating this product constitute a risk of electric shock personal injury death and or ignition of fire This product is intended for evaluation purposes only It shall be operated in a designated test area by personnel qualified according to local requirements and labor laws to work with non insulated mains voltages and high voltage circuits This product shall never be operated unattended This user manual describes the operation of the SSL5031BDB1209 demo board featuring the SSL5031BTS LED driver in a 100 V to 277 V 18 W non isolated application The SSL5031BDB1209 demo board is designed to drive LED loads from 40 V to 80 V with a nominal value of 550 V for best THD performance over universal mains input The PCB dimensions are compatible with T8 tube applications The SSL5031BDB1209 demo board provides a simple and effective solution with a high Power Factor PF low Total Harmonic Distortion THD and high efficiency for Solid State Lighting SSL applications When in a buck topology the LED voltage exceeds 60 V it can influence THD at low mains voltages 1 1 Features UM10795 T8 LED tube application Open short LED string protection OverCurrent Protection OCP OverTemperature Protection OTP PF gt 0 92 at 100 V to 264 V AC 50 Hz 60 Hz input THD lt 20 at 100 V to 264 V AC 50 Hz 60 Hz input Efficiency gt 88 at 100 V to 264
21. te the LEDs n is the number of LEDs in series at the output The non operating output voltage must not be equal to or exceed the voltage set by the operating mode It is good practice to set the level in non operating mode 5 V to 10 V lower than in operating mode IC operating When the voltage in the non operating mode is set to a safe level for the output capacitor the voltage in the operating mode can be set The DEMOVP pin detects overvoltage It triggers when 4 consecutive high frequency cycles at 1 8 V are detected at the DEMOVP R5 R6 R7 R8 sets the output voltage in V P oug R5 R6 The output voltage must never exceed the rated DC voltage of the output capacitor UM10795 All information provided in this document is subject to legal disclaimers NXP Semiconductors N V 2014 All rights reserved User manual Rev 1 4 November 2014 8 of 18 NXP Semiconductors U M1 0795 UM10795 6 5 6 6 SSL5031BDB1209 18 W TLED buck LED driver demo board External overtemperature protection and LED current foldback Figure 12 shows the footprints of resistors R5 and R6 The purpose of these resistors is to provide thermal protection To reduce light output when using output current foldback the DEMOVP pin can be used as an input Replace resistor R5 by a 470 O PTC resistor Resistor R6 is kept at 5 1 kQ If the foldback option is not used resistor R5 can be shorted and resistor R6 can be set to 5 6 kQ Do not use a v
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