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 130C 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 100C 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
WSH41S
Name
P/I/O
Pin#
Description
VDD P 1
Positive Power Supply
Vss P
2
Ground
PS I
3
Power Sleep
OUT2 O 4
Output Pin 2
OUT1 O 5
Output Pin 1
Absolute Maximum Rating (at Ta=25 C)
Supply
Voltage Vcc
--------------------------
20V
Output / FG breakdown Voltage
Vout/Vfg --------------------- 25V
Magnetic flux density
B
--------------------------
Unlimited
Reverse Protection Voltage
Vr -------------------------- 20V
Output Current continuous Ic -------------------------- 500mA
Hold current Ih ------------------------ 600mA
Peak current Ip ------------------------- 800mA
FG ON Current (continuous) If -------------------------- 20mA
Operating Temperature Range
Ta -------------------------- (-20C to +100C)
Storage Temperature Range
Ts -------------------------- (-65C to +150C)
Package Power Dissipation Pd
--------------------------
350mw for SOT-25
Electrical Characteristics: (T=+25C, Vcc=2.8V to 20V)
Characteristic
Symbol Test Conditions
Min
Typ Max Units
Supply Voltage
Vcc
2.8
20
V
Output Saturation
Voltage
Vout(sat) Vcc=20V, Ic=200mA
B > Bop
0.15
0.4
V
Sleep Current
Isleep Vcc=20V, PS<0.6V
2
6
mA
Output Leakage
Current
Ileakage Vcc=20V, B < Brp
<0.1
10
uA
Supply Current
Isupply Vcc=20V, Output &
FG Open
15
23
mA
Output Rising Time
Tr
Vcc=12V, RL=820
CL=20Pf
3.0
10
us
Output Falling
Time
Tf
Vcc=12V, RL=820
CL=20Pf
0.3
1.5
us
Output Time
Differential
t Vcc=12V, RL=820
CL=20Pf
0.3
3
us
Winson reserves the right to make changes to improve reliability or manufacturability.
Winson, 2004/3/3 2
WSH41S
Function Block:
Magnetic Characteristics:
Characteristics Symbol
Quantity
Ta= -20C to +100C
Min Typ. Max
Unit
Operate Point
Bop
Grade A
Grade B
25 50
30
70 Gauss
Release Point
Brp
Grade A
Grade B
-50 -25
-70 -30
Gauss
Hysteresis Window
Bop-Brp
40 200 Gauss
Ordering Information:
SOT- 25: WSH41S-XPD Elec. Grade
1: A Grade (50 Gauss)
2: B Grade (70 Gauss)
Winson reserves the right to make changes to improve reliability or manufacturability.
Winson, 2004/3/3 3
PDF 
ZIP
