General Description:
WSH411 is designed to integrate Hall sensor with complementary output drivers and frequency generator together on the same chip, it is suitable for speed measurement, revolution counting, positioning, and DC brushless motors. It 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. It 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.

FEATUREs:
● Operate from 2.8V to 20V supply voltage.
● On-chip Hall sensor.
● Internal bandgap regulator allows temperature compensated operations and a
   wide operating voltage range.
● High output sinking capability up to 500mA for driving large load.
● Lower current change rate reduces the peak output voltages during switching.
● Available in rugged low profile SOT-25 , SIP-4L packages.
● Built-in FG output.
● Built-in protection diode for reverse power supply fault.
● Built-in thermal lock protection and auto-restart function.