4-Channel Supervisor IC for Power Supply

with OCP & OTP Protections

Features

l Over-voltage protection and lockout for 3.3V, 5V, and two 12V power supplies

l Under-voltage protection and lockout for 3.3V, 5V, and two 12V power supplies

l Over-current protection and lockout for 3.3V, 5V and two 12V power supplies

l Open drain output for PGO and FPO/ pins

l 130mS power good delay

l 75mS delay for under voltage and over current protection

l 38mS for PSON/ de-bounce

l 73uS width noise de-glitches

l Wide power supply voltage range

l Special care for AC power off

l Programmable over-temperature protection

Description

The GR8323F is designed to monitor the outputs of switching power supply and generates the power good signal to inform the system. It provides over-voltage protection, under-voltage protection, over-current protection, and power good signal generating. The over-voltage protection (OVP) and under-voltage protection (UVP) monitor 3.3V, 5V and two 12V to protect the power supply and system. Over-current protection (OCP) monitors IS33, IS5, IS12A, IS12B input current sense. An adjustable over-current trip point composed of Iref and a setting resistor help users design the OCP easily. The over- temperature protection (OTP) input has hysteresis function. GR8323F will shut down in OTP condition. The power-good feature issues a power-good signal when the output is ready; therefore, the GR8323F provides a reliable power supply environment for the system.

Applications

l  PC power supply

l LCD TV power supply

Typical Application Circuit

Package