FAN7527D Fairchild Semiconductor, FAN7527D Datasheet
FAN7527D
Manufacturer Part Number
FAN7527D
Description
Power Factor Correction ICs
Manufacturer
Fairchild Semiconductor
Datasheet
1.FAN7527D.pdf
(14 pages)
Specifications of FAN7527D
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Package / Case
SOP-8
Minimum Operating Temperature
- 25 C
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
FAN7527DTF
Manufacturer:
FSC
Quantity:
1 615
Part Number:
FAN7527DTF
Manufacturer:
FAIRCHILD/仙童
Quantity:
20 000
1. Introduction
The FAN7527 is an active power factor correction(PFC)
controller for boost PFC application which operates in the
critical conduction mode. It turns on MOSFET when the
inductor current reaches zero and turns off MOSFET when
the inductor current meets the desired input current reference
voltage as shown in Fig. 1. In this way, the input current
waveform follows that of the input voltage, therefore a good
.
Application Note AN4107
Design of Power Factor Correction Circuit Using
FAN7527
©2001 Fairchild Semiconductor Corporation
MULT
Gating
Vcc
Idet
Signal
CS
Inductor Current
8
5
4
3
40k
6.5V
2V 1.5V
0 ~ 3.8V
Vm1
K
1.8V
Figure 1. Inductor Current Waveform
8pF
Vm
12V
Figure 2. Block diagram of the FAN7527
1
9V
Zero Current
Vmo
(
Multiplier
Vm
Vmo
Detector
Current Sense
Comparator
2
Vref
UVLO
)
Inductor Peak Current
GND
Vref
6
0.25V
power factor is obtained.
1-1. Internal Block Diagram
It contains following blocks.
• Error amplifier (E/A)
• Zero current detection (Idet)
• Switch current sensing (CS)
• Input voltage sensing (MULT)
• Switch drive (OUT)
Vm2
2.5V Ref
Internal
R
Veao(L)=2.25V
EA_OUT
Detector
S
Current
Bias
OVP
Timer R
2
Inductor Average Current
Vref~Vref+2.5V
Isovp=30uA
Idovp=40uA
Q
Static OVP
Error Amp
Output
Vcc
Drive
Vea(-)
Vref
2.25V
www.fairchildsemi.com
7
1
INV
OUT
Rev. 1.0.2
Rev. A, May 2000
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