LV5026MC A19/E27 LED Bulb Application Reference Design for TRIAC Dimming 2NL1537 Ver1.01 LV5026MC Reference Design for A19/E27 LED Bulb Application. 1.Overview and features 2.Demo Board 3.Specification of application 4.Application construction 5.Typical application 6.Typical performance data 6-1 Efficiency for 12LED load 6-2 Power factor for 12LED load 6-3 Line regulation for 12LED load 6-4 Output voltage /current operation waveform 6-5 Input voltage /current operation waveform 6-6 Startup operation waveform 6-7 Dimming operation waveform 6-8 Switching operation waveform 7.Conducted emission Test 7-1 Inside of the housing 7-2 Outside of the housing 8.PCB layout 8-1Top 8-2 Bottom 9.Transformer specification 10. Part list 1.Overview and features 1. This information presented typical circuit structure using LED driver LV5026MC that has high efficiency, high power factor and TRIAC dimming. 2. LV5026MC is best suitable for LED driver with high power factor and TRIAC dimming. By one converter type PFC structure, the passive PFC circuit and electrolytic capacitor aren’t used at the input block, there is a control function (TRIAC maintenance function) only for TRIAC dimming in inside of IC, cheap and stable driver with a few of parts becomes realizable. 3. LV5026MC operates by fixed frequency control with frequency jitter function which reduces EMI noise. 4. LV5026MC realizes stable dimming operation by means of TRIAC holding-current function. 5. This application of LV5026MC has some protection functions, output (load) open, and load short-circuit detection. Built-in OTP (over temperature protection) function. [Specification of the Demo board] Non insulation type Input AC220V-240V (AC198V to 264V), Oscillation frequency: 70kHz mode (LV5026MC 1-2pin short) 2. Demo board Top view Side view 22mm typ. Device height on board : 17mm typ. 50mm typ. Weight: Board thickness : 1.0mm typ. about 17g Input and output connection block ・AC input ・DC output Attachment spot Hole diameter of board Attachment spot Hole diameter of board AC1 φ1.0 +V φ1.0 AC2 φ1.0 -V φ1.0 3.Specification of application １．LED driver unit with dimming function (Input VAC 230V, Vf 37V If 150mA:12LEDs) ２．Electrical characteristics Description Min Typ Max Input voltage 220 240 V Input voltage range 198 264 V Input frequency Units 50/60 Hz 47 to 63 Hz Output voltage 37 V Output current 150 mA Efficiency 80 % Power Factor 0.8 Input frequency range Comment input/output rating ３．Recommended Condition Using environment only in room Operation temperature range -20 to +50 C Storage temperature range -20 to +70 C temperature around power supply Operation humidity range 30 to 80 %RH no dew Storage humidity range 20 to 80 %RH no dew ４．Insulation characteristics ・Non-Isolation ５．Others ・Conducted Emission CISPR15 based on ・Safety standard IEC60950 based on ・Lifetimes of product 40000hr ※At set mounting state, （set mounting） circumference temperature of electrolytic capacitor：75℃ or less. ６．Validated connection dimmer ・Made by KUEILIN rating:220V ※Input／output rating and normal temperature （25℃）unless otherwise noted. 4.Application construction Bleeder circuit for TRIAC dimmer prevents incorrect Separate line anode and cathode dimmer operation at TRIAC Snubber circuit for TRIAC dimmer Smoothing for VF voltage Prevent in-rush current and reduce noise ZD1 select according to VF voltage Improves Power Factor Startup circuit Supply from auxiliary winding Current sensor resistor 5.Typical application This application shows high power factor LED driver using LV5026MC with TRIAC dimming function. This application is best suitable to 7W class LED driver. Input voltage range is from AC220 to 240V (198 to 264V). Stable LED dimming operation is realized by standard leading edge type TRIAC dimmer. And, device is protected at abnormal operation such as no load, overload, output short. Explanation of circuit function This application realizes high power factor and high efficiency in one converter by LV5026MC. LV5026MC has oscillator, input voltage detection (OVP and UVLO), reference voltage, TRIAC holding-current (bleeder circuit),over temperature protection (OTP), frequency jitter function (skip frequency) ,Pulse by pulse current limit, auto restart and constant current control. Input block The resistor R1 prevents inrush current when startup and dimming control. Furthermore, it protects external parts and LV5026MC from abnormal operation. EMI filter is constructed of C1, L1, C2 and L2, input pin noise is reduced sharply. In case of high power factor, it uses lower capacitor for C1 and C2. Main control circuit When AC voltage is inputted, VIN capacitor (C9) is charged by R10 (start-up resistor). VIN voltage is 9V or more, and LV5026MC works. Then, VIN voltage is supplied from the auxiliary winding of T1. LV5026MC compares CS voltage and REF-IN voltage, performs switching of Q1. Because the REF-IN voltage is based on the AC voltage, AC voltage and AC current become similar wave pattern and power factor is improved. Auxiliary winding voltage is in proportional to output voltage. Auxiliary winding is set by turn ratio of output winding. Because output voltage (LED voltage) is stable, auxiliary winding voltage is also stable. Dimming drive circuit Resistor R3, R4 detect input voltage, if the voltage of ACS pin is less than 3V, OUT2 output becomes ON, bleeder current flows at the low AC input area and stable operation is ensured as active bleeder. The snubber circuit (D3, R8, R9, and C3) absorbs the surge of AC Voltage and prevents the malfunction of TRIAC dimmer. OVP In case of no load, auxiliary winding voltage increases with the rising of output voltage. If VIN pin of LV5026MC reach to about 27V, over voltage detection begins, switching operation stops, and restarts. Those actions are repeated, as a result prevent rising of voltage. Output rectification and smoothing The output voltage of T1 is rectified by D4, smoothed by capacitor C7. In order to realize high efficiency, D4 is selected high-speed diode. If you need control ripple current to LED, the value of output capacitor can be increased. The resistor R15 discharges the LED voltage at the time of operation stop. Oscillation frequency 70kHz mode (LV5026MC 1-2pin short) 6.Typical performance data 6-1 Efficiency for 12LED load 6-2 Power factor for 12LED load 6-3 Line regulation for 12LED load 6-4 Output voltage /current operation waveform ＊input : 230V CH1 : Output Voltage [10V/div] CH4 : Output Current [50mA/div] 6-5 Input voltage /current operation waveform ＊input : 230V CH1 : Input Voltage [200V/div] CH4 : Input Current [100mA/div] 6-6 Startup operation waveform ＊input : 230V CH1 : Input voltage [200V/div] CH2 :Output Voltage [20V/div] Turn-on Delay : about 160ms 6-7 Dimming operation waveform ＊ input : 230V CH2 : Output Voltage [20V/div] CH1 : Input Voltage (dimmer output) [200V/div] CH4 : Input Current (dimmer output) [5A/div] ＊ ＊Phase angle: about 90 degrees 6-8 Switching operation waveform＊ input : 230V CH1 : Q1 VDS [100V/div] CH4 : Q1 ID [500mA/div] 7.Conducted emission Test 7-1 Inside of the housing 7-2 Outside of the housing 8.PCB layout board spec: CEM-3 T=1.0 8-1 PCB Layout Top Arrangement figure Pattern figure 8-2 PCB Layout Bottom Arrangement figure Pattern figure 9.Transformer specification [ TEE13W-110001A ] L=680uH P ( 100T ) B ( 50T ) This Trance can be purchased at the following companies: ■JAPAN 東京パーツ工業株式会社 コイルトランス事業部 販売部 〒372-0022 群馬県伊勢崎市日乃出町 236 番地 電話・FAX TEL.0270-23-3731 FAX.0270-23-8371 E-mail [email protected] ■China 東京元件有限公司 中華人民共和國廣東省汕頭経済特區 龍湖工業區通用厰房第八憧六棲 電話・FAX TEL.86-754-826-1188 FAX.86-754-826-1281 E-mail [email protected] ■Singapore SANWA PARTS PTE.LTD. 3 Pemimpin Drive ＃05-05Lip Hing Industrial Building Singapore 576147 電話・FAX TEL.65-6258-2698 FAX.65-6258-3386 E-mail [email protected] 10.Part list Designator Manufacturer Part Number Manufacturer Footprint Value C1 GA355XR7GB563KW06L MURATA 2220 250V 0.056μ C2 GR331CD72W473KW03L MURATA 1206 450V 0.047μ C3 MDX22W224K NITSUKO Radial 450V 0.22μ C4 GR331CD72W473KW03L MURATA 1206 450V 0.047μ C5 OPEN C7 50ZLJ220uF Rubycon Radial 50V 220μ C9 GRM31CR71H475KA12L MURATA 1206 50V 4.7μ C10 GRM188B11H223KA01 MURATA 0603 50V 0.022μ D1 D1UBA80 Shindengen SOPA-4 800V 1A D2 MRA4005T3 ON Semiconductor SMA 600V 1A D3 OPEN D4 MURA160T3 ON Semiconductor SMA 600V 1A FRD D6 MURA160T3 ON Semiconductor SMA 600V 1A FRD IC1 LV5026MC ON Semiconductor SOIC10 LED DRIVER L1 PJ5H-222K KORIN GIKEN Radial 2.2mH L2 PJ5H-102K KORIN GIKEN Radial 1mH L3 OPEN Q1 SFT1440 ON Semiconductor TP 600V 1.5A Q2 SFT1440 ON Semiconductor TP 600V 1.5A R1 ERG1SJ470 PANASONIC Axial 47Ω 5% 1W R2 ERJ3RBD2201V PANASONIC 0603 2.2kΩ 0.5% 1/10W R3 ERJP08F1004V PANASONIC 1206 1MΩ 1% 1/4W R4 ERJ3EKF7682V PANASONIC 0603 76.8kΩ 1% 1/10W R5 ERJP08F1004V PANASONIC 1206 1MΩ 1% 1/4W R6 ERJ6ENF4701V PANASONIC 0805 4.7kΩ 1% 1/8W R7 OPEN R8 ERG3SJ471 PANASONIC Axial 470Ω 5% 3W R9 ERG3SJ681 PANASONIC Axial 680Ω 5% 3W R10 ERJP08F8203V PANASONIC 1206 820kΩ 1% 1/3W R11 RK73B1JTTD100J KOA 0603 10Ω 5% 1/10W R12 ERJ8BQF1R2V PANASONIC 1206 1.2Ω 1% 1/2W R13 OPEN R14 ERJ6GEYJ471V PANASONIC 0805 470Ω 5% 1/8W R15 ERJ8ENF1502V PANASONIC R16 ERJ6GEY0R00V PANASONIC TEE13W-110001A TOKYO PARTS UDZS13B ROHM T1 ZD1 PCB 15kΩ 1% 1/4W 0805 0Ω CUSTOM SOD-323 13V CEM-3 T=1.0