PS231S

5-Channel Secondary Monitoring IC

Version

：A.002

Page 1

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PS231S

5-Channel Secondary Monitoring IC

General Description

PS231S is specially designed for switching power supply system. Four important

functions of PS231S are the followings: over-voltage protection, over-current protection,

under-voltage protection and power good signal generating.

OVP/UVP (Over-Voltage/Under-Voltage Protection) monitors 3.3V, 5V and triple

12V to protect our power supply and PC, FPO/ goes to high when one of these supply

voltages exceeds their normal operation voltage range.

OCP (Over Current Protection) monitors IS33, IS5, IS12A, IS12B, IS12C input

current sense. An adjustable over-current condition composed of Iref and “protection

current range resistor” helps users design OCP easily.

An additional protection input pin provides the flexibility for design protection

circuit.

Power good signal generating notifies personal computer when power supply is

ready or power supply is going to shutdown, therefore it can provide a reliable power

supply environment.

Features

• Over/Under-voltage protection and lock out

• Over-current protection and lock out

• Additional protection input

• Fault protection output with open drain output stage

• Open drain power good output signal for power good input

• Built-in 300mS power good delay

• AC on 75ms delay for UV/OC protection

• 38mS PSON/ control de-bounce

• Wide power supply range (3.8V~16V)

• Special care for AC power off