WSH411

WSH411 is designed to integrate Hall sensor with complementary output drivers and frequency generator together on the same chip, WSH411 is suitable for speed measurement,revolution counting, positioning, and DC brushless motors. The WSH411 includes a temperature compensated voltage regulator, a differential amplifier, a Hysteresis controller, two open-collector output drivers capable of sinking 1A current load and an open-collector frequency generator capable of sinking 10mA current load. An on-chip protection diode is implemented to prevent reverse power fault.And built-in thermal lock
protection and auto-restart function is suitable for super high speed fan. The WSH411 can replace the function of lock protection and auto restart function. The power will be shutdown automatically at 135°C to prevent the coils be damaged and atuo-restart after cooling down.

The temperature-dependent bias increases the supply voltage of the hall plates and adjusts the switching points to the decreasing induction of magnets at higher temperatures. Subsequently, the open collector output switches to the appropriate state. WSH411 are rated for operation over temperature range from 20˚ C to 100˚C and voltage ranges from 2.8V to 20V.