WSH41S
Hall Effect Sensor IC with Thermal Lock
Protection ,Auto Restart and Speed Control Function
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
600mA
for driving large load.
Lower current change rate reduces the peak output voltages during switching.
Available in rugged low profile SOT-25 packages.
PS pin can accept PWM signal to program rotation speed.
Built-in protection diode for reverse power supply fault.
Built-in
thermal lock protection
and
auto-restart
function.
General Description:
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. It 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. It can
replace the function of lock protection and auto restart function. The power will be
shutdown automatically at 130°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.
WSH41S are rated for operation over temperature range from –20˚ C to 100˚C and
voltage ranges from 2.8V to 20V.
Pin Descriptions: SOT-25
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, 2004/3/3
1
WINSON [ WINSON SEMICONDUCTOR CORP. ]
