HT7L4811 E27/8W 13S, 162mA LED Bulb

Transcription

1 HT7L4811 E27/8W 13S, 162mA LED Bulb D/N: AN0344E Introduction This switched power application is directed at E27 LED bulbs whose characteristics are as follows: Wide input AC source voltage range Non-isolation BUCK mode structure High efficiency, high power factor and low THD over universal input voltage Low output current variation at high/low ambient temperature High LED current accuracy and good load regulation Overvoltage protection, short circuit protection and integrated over temperature protection Simple parameter setup Typical System Characteristic 13S, 162mA / Open Frame Description European (180Vac~265Vac) Wide Range (90Vac~265Vac) Input AC Frequency 47Hz~63Hz Output Voltage (V LED+) 30V DC~43V DC Output Current (I OUT) 162mA(typ) Output Current Ripple 70mA(max) Line Accuracy Load Accuracy Efficiency Power Factor THD Ta= 25 C +1.0% / -0.5% +1.0% / -0.5% Ta= -20 C ~ 85 C +0.1% / -1% +0.1% / -1% Ta= 25 C ±1%@115Vac, ±1%@220Vac Ta= -20 C ~ 85 C ±1.5%@115Vac, ±1.5%@220Vac >87.5%@115Vac, >85%@220Vac with EMI Solution >0.97@115Vac, >0.93@220Vac w/o EMI Solution >0.97@115Vac, >0.95@220Vac 15%@115Vac/220Vac Standby Power Loss <0.1W@115Vac, <0.3W@220Vac Power Loss at Output Short <0.5W@115Vac, <0.7W@220Vac Output Short Protection Yes Output Open Protection Yes EMI EN55015 HA0344E V110 1 / 14 August 10, 2016

2 Application Circuit and BOM HT7L4811 E27/8W 13S, 162mA LED Bulb 90Vac~ 265Vac F1 C1 TVR1 C6 BD1 L1 C2 Q1 D1 R6 R7 L2 C5 R8 LED+ L3 LED- R3 R1 EMI Solution R4 C4 R5 D2 ZD1 IC DRV GND VCC HT7L 4811 C3 ZCD CS COMP R9 Components Package Value Part Number R1 SMD0603 RES 220R R3,R4 SMD1206 RES 220K R5 SMD0805 RES 10R R6 SMD0805 RES 1R5 R7 SMD0805 RES 6R8 R8 SMD1206 RES 33K R9 SMD0805 RES 200K C1 (OPEN) (OPEN) C2 DIP ML 0.1uF/400V C3 SMD0805 CE 0.47uF C4 SMD1210 CE 10uF/50V 105 C C5 DIP 10x18mm EL 270uF/63V 105 C NIPPON CHEMI-CON KY SERIES C6 DIP X CAP 0.1uF/250V BD1 SMB DIODE BRIDGE 1A/400V, B4S PAN JIT D1 SMB ULTRA DIODE 2A/600V, ER2J PAN JIT D2 SMB ULTRA DIODE 1A/600V, ES1J PAN JIT ZD1 SMD1206 ZENER DIODE 20V Q1 TO-252 MOSFET 4A/600V, SVF4N60D L1 DR 8x10 DR CORE 680uH L2 DR 10x12 DR CORE 700uH L3 DR 10x12 DR CORE 3.3MH F1 DIP FUSE 1.0A/250V TVR1 GNR07D471K CERAMATE TECHNICAL CO. IC1 SOT23-6 HT7L4811 HOLTEK PCB LxWxH(mm) 54x26x21 HA0344E V110 2 / 14 August 10, 2016

3 HT7L4811 E27/8W 13S, 162mA LED Bulb System Board Description Functional Description The HT7L4811 is a 6-pin LED lighting controller device implemented using a Buck architecture. It has the advantages of high power factor operation as well as high output current accuracy. Additionally the device requires very few external components, ha a simplified parameter setup and is insensitive to environmental temperature variations. The specific current control algorithm in the device can accurately control the LED output current and can maintain stable system operation with good line regulation over the full AC input voltage range of 90V~265. The device offers good load regulation for different LED types and is insensitive to external inductor value variation. The device current control operates in a boundary conduction mode, which can achieve power factor values in excess of PF>0.9 over the full AC input voltage range, also reducing system switching power losses to improve the system EMI characteristics. The device has an extreme low system start up current and static operation current to reduce system power losses and improve system efficiency. The device includes a number of system protection functions such as output short circuit protection, output over current protection (cycle by cycle current limit), output over voltage protection and over temperature protection. HA0344E V110 3 / 14 August 10, 2016

4 Pin Description VCC There are some points to note regarding the VCC power supply pin. 1. VCC to Ground Capacitor - C4 This capacitor is used to stabilise the device operation to eliminate any 2 nd start-up abnormal phenomenon. The value of C4 must be greater than 10uF. 2. Start-up resistors - R3, R4. The lower the resistor values, the higher the start-up speed. However this will have an impact on the system efficiency. As a guideline these start-up resistor values should have a range of between 300kΩ~600kΩ. 3. The UVLO ON voltage on VCC pin is 18V typically. The VCC operation voltage formula is defined as follows: 29 V > ( VCC = VLED + VZD1 VD2) > 10V As the VCC pin has a UVLO OFF typical value of 10V and an OVP typical value of 29V, the VCC operating value must exist between these two values of 10V and 29V. VCC pin provided protection to avoid exception operating like too big LED series or LED open in this application. Note: 1. Due to the V LED+ ripple voltage, the V LED+ calculation needs to take into account the maximum peak voltage 2. Suggested that the VCC pin is kept at a value between 16V and 18V. 3. The maximum output voltage with an open load is VLED + + ( VCCOVP VCC). 4. The output capacitor, C5, voltage must be greater than the output voltage tolerance of the open load. DRV To permit operation with most types of external MOSFETs, the DRV pin voltage is clamped at a typical value of 17V. ZCD The VCC pin power supply is sourced from the system power. However the power supply design structure could make the VCC pin unable to detect excessive output voltages, that is unable to activate the OVP function. In order to ensure normal system operation, the device has another output OVP protection function on the ZCD pin, which detects over-current situations (>300uA) using a ZCD resistor, R9, to determine OVP conditions. The parameter setting is as follows: V 3 = R 300uA LED + ( open) ZCD CS The output current can be set using external resistors, R6 and R7, whose values are chosen using the following formula: HA0344E V110 4 / 14 August 10, 2016

5 IOUT = 0.2 R6 // R7 In order to obtain higher accuracy output currents, the suggested resistor value error variation must be less than 1%. Additionally, shorter PCB tracks will result in better performance. The inductor parameters are calculated using the following formula : Po π ( 2Vac _ min VLED+ ) Iπk = 2 π η ( 2Vac _ min VLED + cos( θ ) VLED + ( θ )) 2 VLED + VLED + L = (1 ) fs _ min Ipk 2Vac _ min and Po = VLED + IOUT θ = sin 1 ( VLED + ) 2Vac _ min fs _ min =Minimum Switching Frequency. COMP The capacitor, C3, connected to this pin, is for internal reference stabilisation. A value of 0.47uF is recommended. Experimental Results Test Condition: (Includes EMI solution) AC Voltage Range: 90VAC~265VAC LED load is 13S1P and total input power is 8W Vac Pin(W) V LED+(V DC) (ma) P OUT(W) Efficiency(%) PF THD(%) Vac LEDSeries LED Current (ma) PF LED Current (ma) PF HA0344E V110 5 / 14 August 10, 2016

6 AC Turn-On 115Vac Figure 1. Start Up Time at 115Vac 230Vac Figure 2. Start Up Time at 230Vac AC Turn-Off 115Vac Figure 3. Turn Off Delay Time at 115Vac 230Vac Figure 4. Turn Off Delay Time at 230Vac HA0344E V110 6 / 14 August 10, 2016

7 HT7L4811 E27/8W 13S, 162mA LED Bulb VAC/IAC 115Vac Iac Figure 5. Input AC Voltage/Current at 115Vac 230Vac Iac Figure 6. Input AC Voltage/Current at 230Vac LED Current Ripple 58mA Figure 7. DC Output Ripple at 115Vac 62mA Figure 8. HA0344E V110 DC Output Ripple at 230Vac 7 / 14 August 10, 2016

8 Protection: Open load after AC Turn-On 49.6V Figure 9. Open Load Protection at 90Vac 50.4V Figure 10. Open Load Protection at 265Vac Protection: Open load before AC Turn-On 49.6V Figure 11. Open Load Protection at 90Vac 50.0 V Figure 12. Open Load Protection at 265Vac HA0344E V110 8 / 14 August 10, 2016

9 Protection: Short load after AC Turn-On 115Vac Figure 13. Short Output Protection at 115Vac 230Vac Figure 14. Short Output Protection at 230Vac Protection: Short Load Before AC Turn-On 115Vac Figure 15. Short Output Protection at 115Vac 230Vac Figure 16. Short Output Protection at 230Vac HA0344E V110 9 / 14 August 10, 2016

10 System Performance Efficiency (%) 89.0% 88.0% 87.0% 86.0% 85.0% 84.0% 83.0% 82.0% 13S, 162mA 81.0% AC Input (VAC) Figure 17. Efficiency vs. Wide AC Voltage (ma) S, 162mA AC Input (VAC) Figure 18. Regulation vs. Wide AC Voltage Power Factor (PF) S, 162mA AC Input (VAC) Figure 19. Power Factor (PF) vs. Wide AC Voltage (ma) Vac 100Vac 115Vac 135Vac 180Vac 220Vac 240Vac 265Vac 9S 10S 11S 12S 13S AC Input (VAC) Figure 20. vs. LED(s) regulation HA0344E V / 14 August 10, 2016

11 Efficiency 89.0% 88.0% 87.0% 86.0% 85.0% 84.0% 83.0% 82.0% 81.0% 80.0% 9S (162mA) 11S (162mA) 13S (162mA) 10S (162mA) 12S (162mA) AC Input (VAC) Figure 21. Efficiency vs. Wide AC Voltage (Different LED Series) Power Factor (PF) S (162mA) 11S (162mA) 13S (162mA) 10S (162mA) 12S (162mA) AC Input (VAC) Figure 22. Power Factor (PF) vs. Wide AC Voltage (Different LED Series) (ma) (13 LEDs, Open Frame) 90Vac 100Vac 115Vac 135Vac 180Vac 220Vac 240Vac 265Vac Ambient Temperature (Ta) Figure 23. vs. Ambient Temperature Variation THD (%) S, 162mA AC Input (VAC) Figure 24. THD vs. Wide AC Voltage HA0344E V / 14 August 10, 2016

12 EMI: Test in E27 System Level (13S1P) EMI _Radiatied HT7L4811 E27/8W 13S, 162mA LED Bulb Figure 25. EMI_VERTICAL Figure 26. EMI_HORIZONTAL HA0344E V / 14 August 10, 2016

13 EMI _Conduction Figure 27. EMI_LINE Figure 28. EMI_NEUTRAL HA0344E V / 14 August 10, 2016

14 Standard EN Measurement HT7L4811 E27/8W 13S, 162mA LED Bulb The full results meet with the EN regulations. Figure 29. EN /Vin=230Vac/ILED=162mA/13S Figure 30. EN /Vin=110Vac/ILED=162mA/13S HA0344E V / 14 August 10, 2016