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 120C to prevent the coils be damaged
during high temperature and auto-restart at 115C. It can replace the function of lock
protection and auto-restart at low cost.
WSH420 are rated for operation over temperature range from 20 C to 85C 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
Supply Voltage
Vcc --------------------------
15V
Magnetic flux density
B
--------------------------
Unlimited
Reverse Protection Voltage
Vr --------------------------
15V
Output Lock Current
Ic
--------------------------
450mA
Operating Temperature Range
Ta --------------------------
(-20C to +85C)
Storage Temperature Range
Ts --------------------------
(-65C to +150C)
Package Power Dissipation
Pd --------------------------
500mw for SIP-4L
(T=+25C, Vcc=2.4V to 15V)
Characteristic
Symbol Test Conditions
Min
Typ
Max Units
Supply Voltage
Vcc
V
Output Saturation
Voltage
Vout(sat)
Vdrive+Vsink
Vcc=12V, Io=200mA
V
Output Leakage
Current
Ileakage Vcc=12V, B < Brp
<
uA
Supply Current
Isupply Vcc=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
Symbol
Quantity
Ta= -20C to +90C
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 80
Gauss
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
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