FA5502P/M
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4. Block diagram
REF(13)
VCC(10)
CS(11)
ON/OFF(12)
CT(15)
SYNC
ON/OFF
(14)
OSC
3.95V/
2.8V
11µA
UVLO
REF
5V
16.5V/8.9V
VC
(9)
OUT
(8)
PWM.COMP
11k
GND
(7)
1.55V
+
-
15k
ER.AMP
-
CUR.AMP
VIN-
(6)
4.85k
1.55V
+
MUL
OVP.COMP
R
S
S
VFB
(5)
Q
0.39V
1.64V
OCP.COMP
OVP
(4)
IDET(16)
IFB(1)
VDET(3)
IIN-(2)
5. Pin assignment
Pin No.
Symbol
IFB
Function
Description
Output of current error amplifier to connect
compensation network
Current error amplifier
1
output
Inverting input to current
error amplifier
Multiplier input
2
3
IIN-
Inverting input of current error amplifier to
connect compensation network
Input of multiplier to detect sinusoidal
waveform
VDET
Overvoltage
input
protection
4
5
OVP
VFB
Input to overvoltage protection circuit
Voltage error amplifier
Output of voltage error amplifier to connect
compensation network
Inverting input to voltage error amplifier to
detect PFC output voltage
Ground
Output for direct driving a power MOSFET
Power supply to output circuit
output
Inverting input to voltage
error amplifier
6
VIN-
Ground
Output
7
8
9
GND
OUT
VC
Power supply to output
circuit
Power Supply
10
11
12
VCC
CS
ON/OFF
Power supply for IC
A pin to connect a capacitor for soft-start
Input of ON/OFF control circuit
Soft-start
Output ON/OFF control
input
Reference voltage
Oscillator synchronization
13
14
REF
SYNC
Reference voltage output
Input of synchronization signal
input
Oscillator timing capacitor
and resistor
15
16
CT
A pin to connect timing capacitor and
resistor to set oscillation frequency
Input of inductor current signal
Non-inverting input to
IDET
current error amplifier
5
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