Novel Driver Solution for LED Lighting 2015.4.17 1

Outline Solution for Dimmable MR16 Application PSR PFC CV controller for 2-stage Application 2017/4/22 2

Outline Solution for Dimmable MR16 Application PSR PFC CV controller for 2-stage Application 2017/4/22 3

Dimmers and Their Limitations Leading edge dimmer Leading edge dimmers must never be used with a capacitive load extremely high instantaneous current when turning on Cheap and easy to get

Dimmers and Their Limitations Trailing edge dimmer Trailing edge dimmers are not supposed to work with an inductive load A MOSFET and potentially a commercial IC are needed. Relatively expensive

Electronic Transformers Capacitive load The term "electronic transformer" is really a misnomer - it is actually a switch mode power supply (SMPS). A minimum load current is required to assure electronic transformer's functionality

Compatibility of Dimmer and E-Transformer Electronic Transformer TriAC Dimmer

ET behaves as a capacitive load to TRIAC Compatibility of Dimmer and E-Transformer TRIAC Current ET Input Current ET Output Voltage TRIAC Trigger Voltage ET behaves as a capacitive load to TRIAC

Dimmable MR16 LED Driver Electronic Transformer Rectifier SY8726A AC Input Electronic Transformer Rectifier SY8726A Dimmer 2017/4/22

SY8726A Specifications Pinout

Schematic Diagram Boost+buck Topology Startup bleeding

Efficiency with Dimmer and E-transformer Philips ET-E60 Full Angle VIN(VAC) Pin(W) Vout(V) Iout(mA) Efficiency(%) 200 8.47 12.22 491 70.80% 220 8.48 12.19 490 70.43% 240 8.53 12.18 492 70.25%

Typical Waveforms IBUCK_OUT=500mA VIN=220VAC CH1(blue) : VBOOST_IN CH2(cyan) : VBOOST_OUT CH3(pink) : IBOOST_L CH4(green): IBUCK_OUT VIN=220VAC IBUCK_OUT=500mA

Dimming Curve

Compatibility List P O Compatibility Siemens 5UH8222-3NC01 OSRAM Philips ET-A60 HTM-70 ET-S60 ET-E60 Leading Siemens 5UH8222-3NC01 P Siemens 5UH8622-3NC01 Siemens 5UH8722-3NC01 TCL K5/M2 O TCL VM2 TCL A8/426U Schneider EV51RD400 Schneider K31RD400 Philips Q2-2-M1 Panasonic WMS549 CDN D8-TG01 Trailing Clipsal 32E450UDM Sal SDA 450 Hager Blu V1454 Siemens 5TC8 284 Bosch 6513 U-102

Outline Solution for Dimmable MR16 Application PSR PFC CV controller for 2-stage Application 2017/4/22 16

PSR CV eliminating opto-coupler SY5018 Bridge Flyback, PFC, CV HF Buck, CC 2017/4/22 17

Features Constant ON time to achieve high PF PSR eliminating opto-coupler QR-mode operation Excellent short output protection Good transition performance Advanced design on fast start up 2017/4/22 18

Constant on time to achieve high PFC As long as tON is fixed, although tS(t) is varied with t, high power factor is achieved.

PSR eliminating opto-coupler Primary side control VREF is voltage reference, NS is secondary turns of transformer, VSEN is voltage feedback.

QR-mode operation QR mode is adopted to decrease switching loss, it’s achieved by delay after VSEN detects zero-crossing signal In order to ensure valley turned ON, t3 should be around 2 tDelay

Excellent short output protection zoom in When output is shorted, voltage of VSEN is nearly zero, and IC will work at max toff mode. After 32 times max toff , IC hiccup.

Better performance on Transition Good transition performance Better performance on Transition IC set VFB,HIGH above VREF IC set VFB,LOW below VREF When VSEN touch VSEN,HIGH, IC work at Max toff mode to decrease output energy When VSEN touch VSEN,LOW, IC work at Max Ipeak to expedite output energy Output voltage could be clamped at VFB,HIGH and VFB,LOW when transition

Advanced design on fast start up Between 0~t1, IC work at peak current mode to speed up the output voltage rise. After VSEN higher than VFB,LOW, IC work at constant mode to realize high PF. AS the supply voltage at the point VFB,LOW is already enough to supply IC, so smaller capacity of CVIN is needed, so, start up could be very fast.

Design Example

Circuit Diagram

Load Regulation VIN=90V VIN=110V VIN=220V VIN=2640V IO(A) VO(V) 0.80 49.2 49.3 49.5 0.70 49.6 0.60 49.4 0.50 0.40 0.30 0.20 49.8 49.7 0.10 50.0 0.05 49.9 0.00 50.1

Steady Performance VIN(Vac) VO(V) IO(A) PIN(W) PF THD(%) EFF(%) 90 49.3 0.8 44.53 0.996 7.4 88.57% 110 43.91 0.994 9.1 89.82% 132 49.4 43.61 0.992 8.8 90.62% 176 49.5 43.40 0.983 91.24% 220 49.6 43.49 0.968 11.5 264 49.7 0.966 10.6 91.17%

Start up & Shut down VIN=90Vac Start up time=450mS CH1(Blue):VVIN CH3(Pink):VOUT CH4(Green):IOUT

CH3(Pink):VOUT CH4(Green):IOUT Load Transition VIN=110Vac Over shoot 15% Under shoot 20% Full load Null load Null load Full load VIN=220Vac Over shoot 15% Under shoot 20% Full load Null load Null load Full load CH3(Pink):VOUT CH4(Green):IOUT

Thanks! Silergy Silicon Energy-Powering the Future Total power solution provider targeting energy conservation Any enquiry please contact me by larry.huang@silergycorp.com 2017/4/22 31