ML4821CP 데이터 시트보기 (PDF) - Micro Linear Corporation

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ML4821CP

Power Factor Controller

Micro Linear Corporation 

OFF-LINE START-UP AND BIAS SUPPLY GENERATION

The circuit in Figure 11 supplies VCC power to the

ML4821. Start-up current is delivered via R10. The IC

starts when VCC reaches 15.5V. After that time running

power is delivered through the tap on L1. The

configuration shown delivers a voltage proportional to the

PFC output bus voltage.

L1

NP NS

R10

39kΩ

2W

1µF

1µF

TO B+

TO IC

PIN 15

1000µF

NP ≈ VOUT

NS 14V

Figure 11. Bias and Start-up Circuit.

ML4821

Micro Linear

9

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