UF4004(2012) Ver la hoja de datos (PDF) - Infineon Technologies

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Fabricante

UF4004
(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

first valley point. This helps to reduce current spike as well as switching loss and thus improve both efficiency

and EMI performance. Figure 5 shows typical switching waveforms.

Figure 5

Typical operation waveforms: ZCV pin voltage (C1&Z1, yellow), shunt signal Vcs (C2&Z2,

red), drain voltage Vds (C3&Z3, blue) and primary winding’s current (C4&Z4, green) showing

quasi-resonant switching

9.4

Output Waveforms

The single stage PFC design inevitably produces double mains frequency ripple at the output. Increasing output

capacitance value helps reduce output ripple. However, this is often at the expense of the system’s form factor.

In this demo board design, the output capacitor (C9) is sized for an output current ripple which exhibits no

visible light modulation. Figure 6 shows the measured waveforms of output voltage and output current. The

modulation depth of the current ripple is about 25%.

Figure 6 Typical waveforms: Output voltage (C2, blue) and output current (C4, green)

Application Note

10

Version 1.1, 2012-08-03

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