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PS222S

3-Channel Secondary Monitoring IC With Over-Current Protection And an Additional 12V OCP Channel

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PS222S

PS222S

3-Channel Secondary Monitoring IC

With Over-Current Protection

And an Additional 12V OCP Channel

General Description

PS222S is specially designed for switching power supply system. Four important

functions of PS222S are the following: 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 12V to

protect our power supply. FPO/ goes to high when one of these supply voltages

exceeds their normal operation voltage range.

OCP (Over Current Protection) monitors IS33, IS5, IS12 input current sense.

Composed of “Iref“ and “protection current range resistor”, an adjustable over-current

condition helps users design OCP easily.

An additional OCP channel helps users monitor another 12V rail output current.

Power good signal generating can notify 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

• 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

• 73uS de-bounce for noise immunity

• Wide power supply range (4.2V~16V)

• Special care for AC power off

3-Channel Secondary Monitoring IC

Version：A.003

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