7447462152(2012) 데이터 시트보기 (PDF) - Infineon Technologies

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7447462152
(Rev.:2012)

Phase Cut Dimmable Non-isolated Buck Converter for LED Retrofit Bulb with ICL8002G & CoolMOS™ 600V C6

Infineon Technologies 

AN-EVALLED-ICL8002G-B2

Phase Cut Dimmable Non-isolated Buck Converter for LED Retrofit Bulb with ICL8002G & CoolMOS™ 600V C6

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Demo Board

Both top and bottom side of the demo board EVALLED-ICL8002G-B2 are shown in Figure 1.

Figure 1 EVALLED-ICL8002G-B2 demo board (Dimension: 40x20x25mm)

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Schematic

Figure 2 shows the schematic for a 10W non-isolation dimmable LED bulb application designed with ICL8002G.

Figure 2 EVALLED-ICL8002G-B2 schematic

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TRIAC Based Dimmer Compatibility

TRIAC based dimmers work smoothly with resistive loads such as incandescent lamps. However, when

connected to non-resistive loads such as switch mode LED drivers flickering issue can happen primarily due to

insufficient hold-up current and due to current oscillation especially during TRIAC firing. Therefore, to improve

compatibility with TRIAC based dimmers, usually bleeder circuit and damping circuit are implemented in the

LED drivers.

In this design, the fusible resistor F1 is functioning as a fuse as well as a damping element to reduce oscillation and

inrush current. Moreover, both passive bleeder circuit (formed by R1 and C1) and active bleeder circuit (formed by

R3-R6, C3, C4, ZD1, Q1, and Q2) are incorporated to maintain input current above the hold-up current

Application Note

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Version 1.1, 2012-08-03

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