Linear Fan Speed Controller with OTP Function

Features

l Linear fan speed controller

l Wide fan speed control range

l Programmable anti-lock start up timer

l Programmable minimum fan speed

l Adjustable fan speed curve slope

l Programmable knee point and OTP point

l OTP protection with fault output

l Programmable turn on delay time

l Programmable sleep mode point

l SOP8 package

Description

The GR8031 is designed for programming the curve of DC fan speed versus temperature via a NTC thermistor and few counts of passive components. The speed curve includes anti-lock with full speed operation time, minimum fan speed when at idle state, a knee point where fan speed starts to accelerate when temperature over the set point, a programmable slope of fan speed versus temperature, and OTP (over-temperature protection) trig point. The GR8031 sends a low level on FSC pin when the OTP pin is lower than the set point of temperature protection level. It is also built-in the sleep mode function set by logic low.

Applications

l LCD TV power supply

l Game machine power supply

l Industrial or medical power supply

l PC power supply

l Server power supply

Typical Application Circuit

Package