wsh420 winson reserves the right to make changes to improve reliability or manufacturability. ? winson,2005/9/23 1 single coil hall effect ic with thermal lock protection and auto-restart features: operate from 2.4v to 15v supply voltage. on-chip hall sensor. internal bandgap regulator allows temperature compensated operations and a wide operating voltage range. output sinking capability up to 450ma for driving large load. lower current change rate reduces the peak output voltages during switching. available in rugged low profile sip-4l packages. built-in protection resistance for reverse power supply fault. built-in thermal lock protection and auto-restart function. general description: wsh420 is designed to integrate hall sensor with two push-pull output drivers and frequency generator together on the same chip, it is suitable for single coil dc brushless motors. it includes a temperature compensated voltage regulator, a differential amplifier, a hysteresis controller, complementary bi-direction drivers for sinking and driving large current load. an on-chip protection resistor is implemented to prevent reverse power fault.and built-in thermal lock protection and auto-restart function will automatically shutdown power at 120 c to prevent the coils be damaged during high temperature and auto-restart at 115 c. it can replace the function of lock protection and auto-restart at low cost. wsh420 are rated for operation over temperature range from C 20 ? c to 85 ? c and voltage ranges from 2.4v to 15v. name p/i/o pin# description vcc p positive power supply dob o output pin #1 do o output pin #2 vss p ground
wsh420 winson reserves the right to make changes to improve reliability or manufacturability. ? winson,2005/9/23 2 supplyvoltage vcc --------------------------15v magnetic flux density b --------------------------unlimited reverse protection voltage vr--------------------------15v outputlockcurrent ic--------------------------450ma operating temperaturerange ta--------------------------(-20 ? c to +85 ? c) storage temperaturerange ts--------------------------(-65 ? c to +150 ? c) package power dissipation pd -------------------------- 500mwforsip-4l (t=+25 ? c,vcc=2.4v to 15v) characteristic symboltestconditions min typmaxunits supply voltage vcc v output saturation voltage vout(sat) vdrive+vsink vcc=12v, io=200ma v output leakage current ileakagevcc=12v, b < brp < ua supply current isupplyvcc=12v,io=200ma fg on ma
wsh420 winson reserves the right to make changes to improve reliability or manufacturability. ? winson,2005/9/23 3 characteristics symbolquantity ta= -20 ? c to +90 ? c min typ. max unit operate point bop a grade b c 35 50 50 70 120 gauss release point brp a grade b c -50 -35 -70 -50 -120 gauss hysteresis window bop-brp 40 80gauss sip -4l: wsh420-xpan elec.grade sip-4l: 1: a grade (50 gauss) 2: b grade (70 gauss) 3: c grade (120 guass) elec. grade
wsh420 winson reserves the right to make changes to improve reliability or manufacturability. ? winson,2005/9/23 4 testing circuit
wsh420 winson reserves the right to make changes to improve reliability or manufacturability. ? winson,2005/9/23 5 1. sip-4l
wsh420 winson reserves the right to make changes to improve reliability or manufacturability. ? winson,2005/9/23 6 application circuit: figure1.
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