ML4821CS datasheet(9/12 Pages) FAIRCHILD

Part #	ML4821CS

Description	Power Factor Controller

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

Direct Link	http://www.fairchildsemi.com

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9 / 12 page

PRODUCT SPECIFICATION

ML4821

REV. 1.0.2 6/19/01

9

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.

Figure 11. Bias and Start-up Circuit.

1000

µF

R10

39k

Ω

2W

NP

L1

TO IC

PIN 15

TO B+

NS

NP

NS

VOUT

14V

≈

1

µF

1

µF

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