ML4821 데이터 시트보기 (PDF) - Fairchild Semiconductor

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ML4821

Power Factor Controller

Fairchild Semiconductor 

PRODUCT SPECIFICATION

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

REV. 1.0.2 6/19/01

9

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