DIS
CO
NT
INU
ED
Se
pte
mb
er
200
2
FA531X series
25
FA5310BP(S), FA5314P(S), FA5316P(S)
FA5311BP(S), FA5315P(S), FA5317P(S)
s Description
The FA531X series are bipolar ICs for switching power supply
control that can drive a power MOSFET.
These ICs contain many functions in a small 8-pin package.
With these ICs, a high-performance and compact power
supply can be created because not many external discrete
components are needed.
s Features
Drive circuit for connecting a power MOSFET
Wide operating frequency range (5 to 600kHz)
Pulse-by-pulse overcurrent limiting function
Overload cutoff function (Latch or non-protection mode
selectable)
Output ON/OFF control function by external signal
Overvoltage cutoff function in latch mode
Undervoltage malfunction prevention function
Low standby current (90
A typical)
Exclusive choices by circuits (See selection guide on page 25)
8-pin package (DIP/SOP)
s Applications
Switching power supply for general equipment
Bipolar IC
For Switching Power Supply Control
s Dimensions, mm
SOP-8
6.05
5.3
8.2
±0.3
0.4±0.1
1.27±0.2
0.6
0.20
+0.1
–0.05
0~10
°
1
4
8
5
2.0max
DIP-8
FA531X series
s Block diagram
FA5310BP(S)/FA5311BP(S)/FA5316P(S)/FA5317P(S)
FA5314P(S)/FA5315P(S)
1
8
5
4
9.3
6.5
7.6
3.4
4.5max
1.5
3.0min
0~15
0.5±0.1
2.54±0.25
0.3
+0.1
–0.05
Pin
Description
No.
symbol
1
RT
Oscillator timing resistor
2
FB
Feedback
3
IS (+)
Overcurrent (+) detection
4
GND
Ground
5
OUT
Output
6
VCC
Power supply
7
CT
Oscillator timing capacitor
8
CS
Soft-start and ON/OFF control
Pin
Description
No.
symbol
1
RT
Oscillator timing resistor
2
FB
Feedback
3
IS (–)
Overcurrent (–) detection
4
GND
Ground
5
OUT
Output
6
VCC
Power supply
7
CT
Oscillator timing capacitor
8
CS
Soft-start and ON/OFF control