MOUNTAIN VIEW, Calif. -- TelCom Semiconductor Inc. here has added two products toits line of fan controllers that integrate a temperature sensor and a brushless DC fan controller with over-temperature alert in a small 8-pin MSOP.
The TC650 and TC651 are specifically designed for a variety of modern electronic
equipment ranging from notebook and personal computers to set-top boxes and
networking equipment. The new pulse width modulation (PWM) fan speed controllers improve system reliability, reduce acoustic fan noise, extend fan life and lower average operating current.
"The TC650 and TC651 are the most integrated and sophisticated solutions for fan speed monitoring," said George Paparrizos, product marketing manager at TelCom Semiconductor. "These devices eliminate the need for additional temperature sensors while providing the most efficient and inexpensive way to increase fan system reliability."
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 ICs manage fan speed based on the measured junction temperature with a typical accuracy of 2% from 25C to 70C. These devices operate from 2.8 to 5.5 volts and feature a low operating current of 60 microamperes typical.
The TC650 and TC651 eliminate the need for additional temperature sensors with the inclusion of an on-chip over temperature alarm, and do not require any additional software.
Both devices are priced at f$1.29 for 1,000 pieces.