UM10508 230 V (AC) 17 W LED driver and dimmer
Contents
1. Or C13 R1 RGND L2 L1 22nF7 22 Kal 1 D3 act for coll 630 V 2W 5 Pl 680 uH fer coil C1 100 nF c2 c3 D4 BD1 D1 N 400 V ne Eorp mis C8 180 V Oo Da 400 V 400 V m 3M Tace L3 iU R D6 100 pF R4 id o Pl o 7 5 kO 3 W diode04 05 C9 C10 Q3 22k0 22 k0 22 kA LimF imF PNP TO92 R2 AN ps N4 N5 dd P 4 7 kQ 2 W I O R3 10 k0 10 KQ Ew R14 7 5 kO 3 W L SGND 0220 R2 22 kO 22 kQ 22 KQ ICA E 0 25 W Lang RGND 1 20 1 2 SBLEED DRAIN 18 8 uu ra lana GND R23 R24 i l Re p GND enn 2 R19A 10kQ 6 8 kQ 30 kQ 200 kQ 4 17 Dti Wee WBLEED GND ne T ZD33 R27 ttl E vec GND i R19 d oe 39 ko one SOURCE 1 0 75 0 10 kQ j GND GND ii C 9 srieHmness aux H2 D10 R30 nee 3 9 KQ R6 se Re isense 2 net g 7 5kQ R11 100 KQ R31 2 82kQ 49 SSL2102 _ 1kQ Vg ica RC PWMLIMIT R22 BCM61B l eo TOR wa a PEL lw i FH R12 c5 100 pF R32 SGND 100 kQ 330 pF Ro voc Vor 16 V tro LE IC3 A n 1kQ 1 M J 08 SGND lo ba 10 uF ER Es 50V zpaav ZN R16 VACT 200 kQ ah ae cn 1 R13 T X 2 2 nF 510kQ C6 aa a R18 C7 nid 100nF 7 D9 NEN 100kO0 F 4 7 nF i 63V ZD4V3 SGND RGND 1 R14 Ris R17 aaa 001767 3 32. aaa 001884 b Bottom view Fig 2 17 W PAR38 LED demo board UM10508 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 16 January 2012 5 of 17 NXP Semiconductors U M1 0508 230 V AC 17 W LED driver dimmer demo board using the SSL2102 4 Demo board connections UM10508 The demo board is optimized for an AC mains source of 120 V 60 Hz It is designed to work with multiple high power LEDs having a total working voltage of between 18 V and 33 V The output current is set to 600 mA at typical load The output voltage is limited to 33 V When attaching an LED load to the board hot plugging an inrush peak current occurs due to the discharge of output capacitors C9 and C10 Frequent discharges can damage or deteriorate the LEDs Remark Mount the board in a shielded or isolated box for demonstration purposes dimmer 019aaa550 Fig 3 Demo board connections Place a galvanic isolated transformer between the AC source and the demo board if one is used Connect a series of between 5 and 10 LEDs to the output as shown in Figure 3 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 16 January 2012 6 of 17 NXP Semiconductors U M1 0508 230 V AC 17 W LED driver dimmer demo board using the SSL2102
3. 5 Dimmer compatibility NXP Semiconductors has tested the performance of several triac based dimmers having different specifications The range of dimmers which have been tested with the demo board are given in Table 2 Table 2 Tested dimmers An incandescent lamp is used as load Manufacturer Type Voltage V Power Trigger Highdim Lowdim range W level level LK DG07103 230 400 m 91 5 6 5 Italy DG04027 220 to 240 60to400 H 90 3 BG_British BG general 200t0250 60t0500 H 88 13 Legrand V8051 220 40to300 97 1 5 JingNeng JN2301 230 50to400 H 80 0 5 Meierte PDDT 230 630 1 98 0 2 ShiToneSB DIM 230 300 Wi 96 0 CLIPSAL 32E450UDM 220to 240 450 2 89 7 5 Busch Jaeger Elektro 6513 U 102 230 40 to 420 8 92 5 15 HPM CAT700T 230 to 240 10to700 8 90 8 7 1 Leading edge 2 Trailing edge UM10508 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 16 January 2012 7 of 17 NXP Semiconductors U M1 0508 230 V AC 17 W LED driver dimmer demo board using the SSL2102 6 Functional description UM10508 Refer to Figure 4 Demo board 230 V AC schematic on page 12 for more information The AC mains LED driver IC SSL2102 controls and drives a flyback converter circuit and ensures correct dimmer operation The IC has three integrated high voltage switches one of which located between pins DRAIN and SOURCE controls
4. NXP Semiconductors UM10508 3 Specification 230 V AC 17 W LED driver dimmer demo board using the SSL2102 Table 1 Demo board specification Parameter AC line input voltage Output voltage LED voltage Output voltage protection Output current LED current Input voltage and load current dependency Output voltage and load current dependency Temperature stability Current ripple Maximum output power LED power Efficiency Power factor Switching frequency Dimming range Board dimensions Operating temperature EMC Compliance Value Comment 210 V AC to 230 V AC 10 50 Hz 230 V AC model 17 V DC to 33 V DC 33 V DC 500 mA typical 5 to 5 96 between 210 V AC and 250 V AC 10 to 10 96 between 19 V DC to 30 V DC 3 to 3 from 20 C to 100 C 15 at 500 mA typical value 19W depends on load 78 96 to 82 96 20 93 at 230 V AC 40 kHz to 60 kHz at 230 V AC input voltage 100 96 to 0 96 for triac dimmers 82 mm x 62 mm x 35 mm LxBxH 0 C to 105 C FCC15 and IEC 61000 3 2 pre compliant EN 55015 and IEC 61000 3 2 pre compliant UM10508 All information provided in this document is subject to legal disclaimers NXP B V 2012 AII rights reserved User manual Rev 1 16 January 2012 4 of 17 NXP Semiconductors U M1 0508 230 V AC 17 W LED driver dimmer demo board using the SSL2102 aaa 001883 a Top view
5. 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 liability for inclusion and or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and or use is a
6. 14 5791 82 46097 18 231 17 67 0 934 29 1 0 498 14 4918 82 01358 19 229 17 56 0 939 29 0 496 14 384 81 91344 20 231 17 48 0 931 29 0 491 14 239 81 45881 UM10508 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 16 January 2012 15 of 17 NXP Semiconductors UM10508 230 V AC 17 W LED driver dimmer demo board using the SSL2102 11 Legal information 11 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 11 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 outside of NXP Semiconductors In no event shall NXP Semiconductors be liable for any indirect incidental punitive special or consequential damages
7. 2000 uF 300 x 6 H Using a series of LEDs the dynamic resistance of each LED can be added to the total dynamic resistance 1 M Weiland 28 07 2006 UM10508 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 16 January 2012 10 of 17 NXP Semiconductors U M1 0508 UM10508 7 3 7 4 230 V AC 17 W LED driver dimmer demo board using the SSL2102 Adapting to high power reverse phase transistor dimmers Reverse phase transistor dimmers differ in two ways that can be beneficial Due to the negative phase there is no inrush current when the dimmer triggers Using triac dimmers there is a sudden voltage difference over the input resulting in a steep charge of the input capacitors The resulting peak current results in higher damper dissipation Using transistor dimmers the steep charge is missing The input capacitors are less stressed and the input circuit is less prone to audible noise e Transistor dimmers contain active circuitry that requires a load charge while the dimmer is open To avoid internal dimmer losses the dimensioning of the internal supply voltage generation circuit is critical This means that the remaining voltage drop across the lamp must be low enough to allow this charge to be reached The minimum load to achieve such a low voltage drop results in inefficient operation at low output power levels The cause o
8. during the MOSFET on time Capacitors C9 and C10 buffer the flyback converter output power This configuration gives the circuit a resistive input current behavior in undimmed mode see curve l in Figure 4 In dimmed mode the dimmer latch and hold current must be maintained In addition add a damper to reduce the inrush current and dissipate the electric power stored in the dimmer LC filter A serial resistor is used as a damper at power ranges of less than 10 W However a resistor is inefficient at higher power ranges This effect is due to the significant voltage drop and dissipation that occurs from the supply current to the flyback converter The Darlington transistor Q4 provides the necessary high gain Q4 is saturated while its base voltage is higher than the emitter voltage plus the base emitter voltage Vgg The voltage across emitter resistor R14 increases with the current When the emitter voltage rises above the threshold Q4 stops saturation turns off and R15 limits the current Choose the values of D9 and R13 with care to ensure consistent operation A Darlington transistor provides the necessary high current gain This modification changes the specifications of efficiency and power factor All information provided in this document is subject to legal disclaimers NXP B V 2012 AII rights reserved User manual Rev 1 16 January 2012 8 of 17 NXP Semiconductors U M1 0508 UM10508 230 V AC 17 W LED drive
9. flyback input power When the switch opens current flows and is stored as energy in transformer TX1 The current is interrupted when either e the duty factor exceeds the 75 maximum level set using the PWMLIMIT pin the voltage on the SOURCE pin exceeds 0 5 V In the next cycle the energy stored in the transformer discharges via D6 to output capacitors C9 and C10 The load absorbs the energy The external RC components connected to pins RC and RC2 control the internal oscillator timing These external components set the flyback converter frequency The upper and lower frequency values are set using the BRIGHTNESS pin The ratio between R11 and R12 sets flyback converter frequency range The two other switches in the IC are called weak bleeder pin WBLEED and strong bleeder pin SBLEED When the voltage on these pins is below a certain value typically 52 V the strong bleeder switches on A path is provided for the load current to the dimmer during zero voltage crossing The dimmer timer is reset When the voltage on the pins is above 52 V and the voltage on pin ISENSE 100 mV transistor Q3 switches the weak bleeder on The weak bleeder supplies a boosted hold current to the dimmer to maintain stable latching when the flyback converter draws insufficient current Figure 4 shows the bleeder voltage against time in dimmed and undimmed modes The demo board is optimized to work at a power factor above 0 9 The flyback converter operates
10. 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 11 3 Trademarks Notice All referenced brands product names service names and trademarks are the property of their respective owners NXP B V 2012 AII rights reserved User manual Rev 1 16 January 2012 16 of 17 NXP Semiconductors U M1 0508 230 V AC 17 W LED driver dimmer demo board using the SSL2102 12 Contents 1 Introduction lesen 3 2 Safety Warning esesesesee 3 3 Specification eee eee eee 4 4 Demo board connections 6 5 Dimmer compatibility 7 6 Functional description 8 7 System optimization 10 7 1 Changing output voltage and LED current 10 7 2 Changing the output ripple current 10 7 8 Adapting to high power reverse phase transistor dimmers 20 0005 11 7 4 Changing the output current 11 8 Demo board schema
11. 0 3300 100 300 300 30 Q 6800 6800 200 200 Optional Some resistor values are shown with format x x x which represent the values required of resistors connected in parallel Demo board 230 V AC schematic 8 oneuiauos pJeoq ow q ZOLZ1SS 9ui usn pseog ow p 1euiurp jeAup GAT M LI OV A OEZ SOSOLINN SJOJONPUODIWSS dXN NXP Semiconductors UM10508 230 V AC 17 W LED driver dimmer demo board using the SSL2102 9 PCB components Table 3 Demo board 230 V AC components Reference Quantity Description Part Comment BD1 1 bridge diode DB107S C1 1 100 nF 400 V CM150 5_6X12 EMI C2 C3 2 Pi filter 0 1 uF 400 V CM150 5 6X18 C4 1 Votre gt 105 C 4 7 uF 50 V CAL04 5 C5 1 Cosc 330 pF 0805C C6 1 330 nF 50 V CAL04 5 active damper on C7 1 4 7 nF 0805C WBLEED on noise C8A 1 Vcc gt 105 C 10 uF 50 V CAL04 5 C9 C10 2 1 mF 35 V gt 105 C ECOUT C11 1 Y capacitor 2 2 nF 400 V 7 C12 1 100 uF 16 V CAL04 5 time control CC OCP on C13 1 2 2 nF 630 V CM150 5 6X12 EMI D1 0 Zener diode 250 V P6KE250 D3 1 diode 02 10 HER107 D4 1 Zener diode 180 V 3 W DIP2 BZT030180 D5 1 diode DIP2 HER107 D6 1 diode DIP2 HER303 D7 1 diode SO8 IN4148 D8 1 Zener diode ZD33V D9 1 Zener diode 4 3 V SMD SOD80 z D10 1 diode SO8 IN4148 D11 1 Zener diode ZD33V IC1 1 IC SO20 SSL2102 IC3 1 optocoupler IC04 10 PC LTV 817B IC4 1 current mirr
12. 3 E tune for CC_OCP R24 1 6 8 kQ 0603 current limit R25 1 0 22 Q 0 25 W 1 DIP RT3 5MM DIP R27 1 51 kQ 0603 tune for CC_OCP R29 1 3 9 kQ 0603 tune for CC_OCP R30 1 0 9 0603 R31 R32 2 1 kQ 0603 4 tune for CC OCP TX1 1 transformer 1 mH EFD25 DIP W rth Elektronik UM10508 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 16 January 2012 14 of 17 NXP Semiconductors UM10508 10 Test results 230 V AC 17 W LED driver dimmer demo board using the SSL2102 10 1 Input and output stability Table 4 Input and output stability test results No Board Vin Pi W PF Vo V lo A Po W n V AC 1 230 17 87 0 936 29 1 0 503 14 6873 81 9099 2 230 17 56 0 932 29 0 487 14 123 80 42711 3 232 17 79 0 933 29 0 495 14 355 80 6914 4 230 17 25 0 938 29 0 489 14 181 82 2087 5 232 17 79 0 933 29 1 0 499 14 5209 81 62395 6 229 17 48 0 943 29 0 493 14 297 81 79062 7 229 17 45 0 934 29 0 499 14 471 82 92837 8 229 17 48 0 934 29 0 492 14 268 81 62471 9 230 17 48 0 935 29 0 493 14 297 81 79062 10 230 17 48 0 93 29 0 499 14 471 82 78604 11 231 17 56 0 928 29 0 497 14 413 82 07859 12 230 17 51 0 94 29 0 494 14 326 81 81611 13 232 17 25 0 943 29 0 487 14 123 81 87246 14 229 17 58 0 935 29 0 496 14 384 81 82025 15 229 17 21 0 92 29 0 484 14 036 81 55723 16 229 17 39 0 936 29 0 491 14 239 81 88039 17 231 17 68 0 932 29 1 0 501
13. UM10508 230 V AC 17 W LED driver and dimmer Demo board using the SSL2102 Rev 1 16 January 2012 User manual Document information Info Content Keywords SSL2102 AC mains supply dimmable LED driver AC DC conversion Abstract This User manual describes a demonstration demo board for evaluating an AC mains LED driver with a dimmer for 17 W PAR38 LEDs using the SSL2102 It also describes key features and connections to aid the design of LED drivers for typical applications NXP Semiconductors U M1 0508 230 V AC 17 W LED driver dimmer demo board using the SSL2102 Revision history Rev Date Description v 1 20120116 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 UM10508 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 16 January 2012 2 of 17 NXP Semiconductors U M1 0508 230 V AC 17 W LED driver dimmer demo board using the SSL2102 1 Introduction WARNING Lethal voltage and fire 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 qual
14. f which is that most of the energy is wasted driving the dimmer instead of used to producing light The weak bleeder resistor values of R3 and R4 are chosen to ensure that any losses are within acceptable limits These losses only occur in dimmed mode at the end of the phase The voltage drop in some transistor dimmers is not sufficient for full control of the dimming range The SSL2102 senses the dimming range by taking the average rectified voltage as input To compensate for the reduced voltage difference the voltage detection can be made more sensitive by placing a Zener diode in series with R2 The dimming curve is steeper and shifted when using triac dimmers because of increased sensitivity Changing the output current The output current can be set initially by varying the values of R29 and R27 The power section and transformer train can withstand output currents up to 500 mA but losses increase at higher current levels Resistors R19A R19B limit the primary peak current and consequently the maximum output power All information provided in this document is subject to legal disclaimers NXP B V 2012 AII rights reserved User manual Rev 1 16 January 2012 11 of 17 jenuew Jes zLOZ Avenuer 9 Ady sieuirejosip ea 0 joefqns s jueuinoop SI ui PEPIAOIG uoneuuojul y LK Jo cl 80SOLWN penjiesei suu Iv ZLOZ A 8 dXN GO 1 Fig 4
15. ified 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 a demo board for evaluating an AC mains LED driver with a dimmer for 17 W PAR38 LEDs using the SSL2102 It describes key features and connections to aid the design of LED drivers for typical applications The demo board operates from an AC mains voltage of 230 V AC at 50 Hz The resulting design is a trade off between high power factor efficiency and dimmer compatibility combined with high output stability and ElectroMagnetic Compatibility EMC compliance 2 Safety Warning The demo board is powered by AC mains voltage Avoid touching the board when power is applied An isolated housing is obligatory when used in uncontrolled non laboratory environments The secondary circuit with LED connection has galvanic isolation however this isolation is not in accordance with any standard and has not been thoroughly tested Always provide galvanic isolation of the mains phase using a variable transformer The following symbols identify isolated and non isolated devices 019aab173 019aab174 a Isolated b Non isolated Fig 1 Isolated and non isolated symbols UM10508 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 16 January 2012 3 of 17
16. or BCM61B L1 1 EMI MHz level FERCHOCK W E BEAD L2 0 WECHOCK 680 uH SMD L3 1 WECHOCK 2 100 uH SMD Q3 1 PNP transistor TO92 KSP92 Q4 1 NPN transistor TO220 ST901T R1 3 6 8 kQ R POWER 2 2 KQ 2 W SMD z three in parallel R2 1 1 5 MQ 5 1206 tune for maximum on VctrL R3 R4 6 22 kQ R POWER 15 kQ 3 W SMD three in parallel R5 2 10 KQ R POWER 4 7 KQ 2 W SMD two in parallel R6 1 7 5 KQ 0805 tune for dimming curve R8 1 30 kQ 1206 hold current compensation R9 1 200 kQ 1206 s hold current compensation R10 1 12 ko 0805 tune for minimum off Vcrni R11 1 Cosc 0805 8 2 KQ UM10508 All information provided in this document is subject to legal disclaimers NXP B V 2012 All rights reserved User manual Rev 1 16 January 2012 13 of 17 NXP Semiconductors UM10508 230 V AC 17 W LED driver dimmer demo board using the SSL2102 Table 3 Demo board 230 V AC components continued Reference Quantity Description Part Comment R12 1 100 kQ 0805 R18 WBLEED on R13 1 390 kQ RT3 5MM 1W DIP DIP R14 3 10 0 RT5MM 3 3 9 2 W SMD 7 three in parallel R15 2 680 0 RT5MM 330 9 2 W SMD two in parallel R16 1 200 kQ 0805 WBLEED on R17 3 20 0 RT5MM 10 9 2 W SMD two in parallel R18 1 100 kQ 0805 z R19 1 0 75 Q 1 96 1206 tune for lpk R20 1 1 kQ 0805 tune for dimming curve R21 1 100 kQ 0805 E R22 1 10 0 0805 VCC noise R23 R26 2 10 ko 060
17. pler IC3 forces pins PWMLIMIT and BRIGHTNESS LOW At a value below 400 mV the MOSFET on time is zero The feedback loop has a proportional action only The gain is critical because of phase shift caused by the flyback converter and C6 The relationship between pin PWMLIMIT and the output current is quadratic in nature The resulting output current spread is acceptable for most LED applications If higher demands are placed on LED current spread a secondary regulation circuit in combination with an added pure current action control is advisable The dimming range is detected by sensing the average rectified voltage R2 and R10 form a voltage divider and C4 filters the resulting signal The flyback converter sets its duty factor and converter frequency accordingly All information provided in this document is subject to legal disclaimers NXP B V 2012 AII rights reserved User manual Rev 1 16 January 2012 9 of 17 NXP Semiconductors U M1 0508 230 V AC 17 W LED driver dimmer demo board using the SSL2102 7 System optimization The modifications described in this section can be applied to achieve customer application specifications 7 1 Changing output voltage and LED current One of the major advantages of a flyback converter over other topologies is its suitability for driving different output voltages In essence changing the winding ratio while maintaining the value of the primary inductance shifts the outpu
18. r dimmer demo board using the SSL2102 A combination of serial resistance and a parallel damper is chosen The serial resistance comprises R14 R15 and R17 The parallel group damper comprises C1 C13 and R1 in parallel with C8 and R7 for optional fine tuning To improve efficiency the major serial damping is activated only when there is a peak inrush current active inrush current limiter In normal operation the Darlington transistor Q4 conducts bypassing R15 and lowering ohmic losses When a high inrush current is detected Q4 starts to clip at its maximum current of 500 mA The flyback converter input circuit must have a filter that is partially capacitive C2 L2 C3 C13 and L1 form a filter that blocks most of the disturbance caused by the flyback converter input current The drawback of this filter is a reduced power factor due to the capacitive load A lower flyback converter power relative to the capacitive value of this filter buffer reduces the power factor With the 230 V AC design using 330 nF capacitors a minimum power factor of 0 93 is achieved The demo board has a feedback loop to limit the output current The feedback loop senses the LED current through sense resistor R25 and current mirror circuit with IC4 The current level can be set using R27 and R29 The same feedback loop is also used for overvoltage protection If the LED voltage exceeds 33 V a current starts to flow through R23 and D11 The current through the optocou
19. t 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 UM10508 All information provided in this document is subject to legal disclaimers 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 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 the customer s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the produc
20. t working voltage accordingly Part of the efficiency of the driver is linked to the output voltage A lower output voltage increases the transformation ratio and cause higher secondary losses In practice mains dimmable flyback converters have an efficiency of e 85 for higher output power and voltage such as 60 V 60 for lower output power and voltage such as 1 W and 3 V At lower voltages synchronous rectification is advisable to reduce losses after high current is rectified NXP Semiconductors TEA1761 and TEA1791 synchronous rectification controllers are ideal for this purpose Calculations for transformer properties and peak current are described in detail in application note AN10754 SSL2101 and SSL2102 dimmable mains LED driver 7 2 Changing the output ripple current The LED voltage The LED dynamic resistance and the output capacitor determine the output ripple current While the values of C9 and C10 are chosen to optimize capacitor size with light output A ripple of 15 96 results in an expected deterioration of LED brightness of less than 1 95 The size of the buffer capacitor is determined using Equation 1 ied 1 C10 C9 x AI OX f Raus Example A 45 ripple current a 50 Hz AC mains frequency and a 0 6 Q dynamic resistance 20 results in a combined C9 C10 value of Suse 111 mF A ripple current of 25 and a dynamic resistance of 6 Q results in a value for C9 C10 4
21. tic 12 9 PCB components sesessss 13 10 Test results 0 cee eee 15 10 1 Input and output stability ss 15 11 Legal information Less 16 11 1 Definitions 00202 eee eee 16 11 2 Disclaimers 00 0000e eee eeee 16 11 3 Trademarks 000020 cee eee eee 16 12 Contents 2 2 le mre tee eran ee 17 Please be aware that important notices concerning this document and the product s described herein have been included in section Legal information O NXP B V 2012 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 16 January 2012 Document identifier UM10508
22. ts 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 of such damages Notwithstanding any damages that customer might incur for any reason whatsoever including without limitation all damages
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