WSH41S

WSH41S is designed to integrate Hall sensor with complementary output drivers and speed control function together on one chip, it is suitable for speed measurement, revolution counting, positioning, and DC brushless motors. The WSH41S includes a temperature compensated voltage regulator, a differential amplifier, a Hysteresis controller, two open-collector output drivers capable of sinking 600mA current load and PS pin which can accept PWM signal to do speed control programming. 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 WSH41S can replace the function of lock protection and auto restart function. The power will be shutdown automatically at 130 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. WSH41S are rated for operation over temperature range from 20 to 100 and voltage ranges from 2.8V to 20V.