Fan Controllers

TelCom Semiconductor has two additions to its line of fan controllers, the TC650 and TC651.

These devices integrate a temperature sensor and a brushless DC fan controller with over temperature alert in a small eight-pin MSOP package.

The pulse width modulation fan speed controllers improve system reliability, reduce acoustic fan noise, extend fan life and lower average operating current.

They are specifically designed for a variety of modern electronic equipment ranging from notebook and personal computers to set-top boxes and networking equipment.

The TC650 and TC651 drive any standard two-wire fan through a low cost transistor or logic level MOSFET and provide temperature proportional fan speed control, whereby the fan speed is increased linearly from 40% speed to 100% speed based on a user-programmed temperature range.

These integrated circuits manage fan speed based on the measured junction temperature with a typical accuracy of &#plusmn;2% from 25 to 70&#deg;C.

These devices operate from 2.8 to 5.5 V and feature a low operating current of 60 uA typical.

They eliminate the need for additional temperature sensors with the inclusion of an on-chip over temperature alarm. These user-friendly devices do not require any additional software.

The TC650 also features a minimum fan speed setting functionality, while the TC651 has an auto shutdown mode should temperature fall below the factory set point.