WSH412

WSH412
Hall Effect Sensor IC with Thermal Lock Protection
and Auto Restart 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 , 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.
General Description:
WSH412 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 600mA 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 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.
WSH412 are rated for operation over temperature range from –20˚ C to 100˚C and
voltage ranges from 2.8V to 20V.
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, 2015/1/23
1
WSH412
Pin Descriptions: SOT-25
Name
P/I/O
Pin#
VDD
P
1
Vss
P
2
FG
O
3
OUT2
O
4
OUT1
O
5
Description
Positive Power Supply
Ground
Frequency Generator
Output Pin 2
Output Pin 1
Pin Descriptions: SIP-4L
Name
P/I/O
Pin#
Vcc
P
1
OUT1
O
2
OUT2
O
3
Vss
P
4
Description
Positive Power Supply
Output Pin #1
Output Pin #2
Ground
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
Storage Temperature Range
Package Power Dissipation
Ta -------------------------Ts -------------------------Pd --------------------------
(-20˚C to +100˚C)
(-65˚C to +150˚C)
350mw for SOT-25
500mw for SIP-4L
SIP-5L
Electrical Characteristics:
(T=+25˚C, Vcc=2.8V to 20V)
Characteristic
Symbol Test Conditions
Min
Typ Max Units
Supply Voltage
Vcc
V
─
2.8
─
20
Output Saturation Vout(sat) Vcc=20V, Ic=200mA ─
V
0.15
0.4
Voltage
B > Bop
FG Saturation
Vfg(sat) Vcc=20V, If=10mA
V
─
0.15
0.4
Voltage
B > Bop
Output Leakage
Ileakage Vcc=20V, B < Brp
uA
─
<0.1
10
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, 2015/1/23
2
WSH412
Current
Supply Current
Isupply Vcc=20V, Output &
FG Open
Output / FG Rising
Tr
Vcc=12V, RL=820Ω
Time
CL=20Pf
Output / FG Falling
Tf
Vcc=12V, RL=820Ω
Time
CL=20Pf
Output / FG Time
△t
Vcc=12V, RL=820Ω
Differential
CL=20Pf
─
20
30
mA
─
3.0
10
us
─
0.3
1.5
us
─
0.3
3
us
Function Block:
Magnetic Characteristics:
Characteristics
Symbol
Operate Point
Bop
Release Point
Brp
Hysteresis Window
Quantity
Grade A
Grade B
Grade C
Grade A
Grade B
Grade C
Bop-Brp
Ta= -20˚C to +100˚C
Min
Typ.
25
30
50
-50
-25
-70
-30
-120
-50
40
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, 2015/1/23
3
Unit
Max
50
70
120
Gauss
Gauss
200 Gauss
WSH412
Operating Current vs. Thermal Protection temperature
Operating Current V.S Temperature
150
125
100
75
50
25
0
600mA
550mA
500mA
450mA
400mA
350mA
300mA
250mA
溫度℃
Ordering Information:
SIP- 4L: WSH412-XPAN□
Elec. Grade
SOT-25: WSH412-XPDN□
SIP-4L
1: A Grade (50 Gauss)
Elec. Grade
N: Non-lead Process
2: B Grade (70 Gauss)
3: C Grade (120 Gauss)
SOT-25:
1: A Grade (50 Gauss)
2: B Grade (70 Gauss)
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, 2015/1/23
4
WSH412
Test Circuit:
SIP-4L
SOT-25
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, 2015/1/23
5
WSH412
Package Information:
SOT-25
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, 2015/1/23
6
WSH412
SIP-4L
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, 2015/1/23
7
WSH412
Application Circuit:
SOT-25
Figure 1.
SIP-4L
Figure 2.
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, 2015/1/23
8