ML4821IS MICRO-LINEAR [Micro Linear Corporation], ML4821IS Datasheet - Page 9

• Manufacturer Part Number: ML4821IS
• Description: Power Factor Controller
• Manufacturer: MICRO-LINEAR [Micro Linear Corporation]

OFF-LINE START-UP AND BIAS SUPPLY GENERATION
The circuit in Figure 11 supplies V
ML4821. Start-up current is delivered via R10. The IC
starts when V
power is delivered through the tap on L1. The
configuration shown delivers a voltage proportional to the
PFC output bus voltage.
L1
N
P
N
N
S
P
N
S
Figure 11. Bias and Start-up Circuit.
V
14V
CC
OUT
reaches 15.5V. After that time running
39k
R10
2W
1 F
1 F
CC
power to the
1000 F
TO B+
Micro Linear
TO IC
PIN 15
ML4821
9