FAN7528 Datasheet, PDF (15/21 Pages) Fairchild Semiconductor – Dual Output Critical Conduction Mode PFC Controller

Typical application circuit
Application
Adapter
Output power
100W
Input voltage
Universal input
(90~264Vac)
Output voltage
389V/232V
Features
• High efficiency (>90% at 90Vac input)
• Low THD(total harmonic distortion) (<10% at 264Vac input)
• Dual output control
Key Design Notes
• Diode D4 is used to prevent IC malfunction that can happen if the CS pin voltage is lower than -0.3V.
• Important Component s for low THD are R2, R5 and C11.
1. Schematic
BD
NTC
C3 C4
C5
R3
T1
V_AUX
R4
R5
C10
D3
ZD1
R6
D1 _C11
D2
Q1
PFC OUTPUT
R10
C9
C2
LF1
FAN7528
R2
C1
R11
V1
F1
R8
R7
C8 ^{C7 R1}
C6
D4
AC INPUT
Figure 39. Schematic
15
www.fairchildsemi.com
FAN7528 Rev. 1.0.1