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ML4821 Datasheet(PDF) 9 Page - Micro Linear Corporation

Part # ML4821
Description  Power Factor Controller
PDF  12 Pages
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Manufacturer  MICRO-LINEAR [Micro Linear Corporation]
Direct Link  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4821 Datasheet(HTML) 9 Page - Micro Linear Corporation

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9
ML4821
Micro Linear
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
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.



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