
FA7For Switching Power Supply Control
1
I
Description
The FA7610CP(N), 7612CP(N) and 7617CP(N) are bipolar
ICs containing basic circuits necessary for PWM-type
switching power supply control.
To minimize the number of external discrete components, the
FA7610CP(N) is provided for a flyback or step-up power-
supply circuit, the FA7612CP(N) for a step-down power-supply
circuit and FA7617CP(N) for a flyback power supply circuit.
I
Features
FA7610CP(N)
For flyback transformer-type or step-up power-supply circuit
(maximum output duty = 64% typical)
Totem-pole predriver
PWM-type switching power supply control
Low-voltage operation (V
CC
= 3.6 to 22V)
Latch-mode short-circuit protection function (no malfunction
by noise)
Soft-start function
Undervoltage lockout function
One capacitor shared for short circuit protection and for soft-
start to minimize the number of external discrete components
FA7612CP(N)
For step-down power-supply circuit
(maximum output duty = up to 100%)
Open collector output
PWM-type switching power supply control
Low-voltage operation (V
CC
= 3.6 to 22V)
Latch-mode short-circuit protection function (no malfunction
by noise)
Soft-start function
Undervoltage lockout function
One capacitor shared for short circuit protection and for soft-
start to minimize the number of external discrete components
FA7617CP(N)
For flyback transformer-type power-supply circuit (maximum
output duty = 67% typical)
Open collector output
PWM-type switching power supply control
Low-voltage operation (V
CC
= 3.6 to 22V)
Latch-mode short-circuit protection function (no malfunction
by noise)
Soft-start function
Undervoltage lockout function
One capacitor shared for short circuit protection and for soft-
start to minimize the number of external discrete components
I
Applications
Battery power supply for portable equipment
I
Dimensions, mm
á
SOP-8
4.9
3
6
±
0
0.4
±
0.1
1.27
±
0.2
0
+
0
°
1
4
8
5
1
á
DIP-8
Bipolar IC
FA7610CP(N)/12CP(N)/17CP(N)
1
8
5
4
9.3
6
7.6
3
4
1.5
3
0~15
0~15
0.5
±
0.1
2.54
±
0.25
0.3
+0.1