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Data Sheet SINGLE PHASE HALL EFFECT LATCH General Description
The AH477A is an integrated Hall sensor with Hbridged output driver designed for brushless DC motor applications. The device includes an on-chip Hall sensor for magnetic sensing, an amplifier that amplifies the Hall voltage, a comparator to provide switching hysteresis for noise rejection, a bi-directional drivers for sinking and driving large current load. It also includes an internal bandgap regulator to provide temperature compensated bias for internal circuits and allows a wide operating supply voltage range. Placing the device in a variable magnetic field, if the magnetic flux density is larger than threshold BOP, the DO is turned to sink and DOB is turned to drive. This output state is held until the magnetic flux density reverses and falls below BRP, then causes DO to be turned to drive and DOB turned to sink. The AH477A is available in TO-94 (SIP-4L) package.
AH477A Features
* * * * * * * * * On-Chip Hall Sensor Operating Voltage: 3.5V to 18V H-Bridge Output Drivers for Single Coil Internal Bandgap Regulator for Temperature Compensation Low Output Switching Current Noise Operating Temperature: -20oC to 85oC Low Profile TO-94 (SIP-4L) Package ESD Rating: 6000V (Human Body Model) Suitable for PWM Power Supply Control Speed
Applications
* * Single-coil Brushless DC Motor Single-coil Brushless DC Fan
TO-94
Figure 1. Package Type of AH477A
Oct. 2009 Rev. 1. 2 1
BCD Semiconductor Manufacturing Limited
Data Sheet SINGLE PHASE HALL EFFECT LATCH Pin Configuration
Z4 Package (TO-94) GND DOB DO VCC
AH477A
4 3 2 1
Figure 2. Pin Configuration of AH477A (Front View)
Pin Description
Pin Number 1 2 3 4 Pin Name VCC DO DOB GND Supply voltage Output 1 Output 2 Ground Function
Oct. 2009 Rev. 1. 2 2
BCD Semiconductor Manufacturing Limited
Data Sheet SINGLE PHASE HALL EFFECT LATCH Functional Block Diagram
VCC 1 Regulator 2 DO VCC
AH477A
Hall Sensor
Amplifier
Schmitt Trigger
PreDriver
VCC 3 4 GND
DOB
Figure 3. Functional Block Diagram of AH477A
Ordering Information
AH477A Circuit Type Package Z4: TO-94 (SIP-4L) G1: Green Magnetic Characteristics A: 5 to 70 Gauss B: 100 Gauss
Part Number AH477AZ4-AG1 AH477AZ4-BG1 Marking ID 477AZ4-G1 477AZ4-G1 Packing Type Bulk Bulk
Package TO-94
Temperature Range -20 to 85oC
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.
Oct. 2009 Rev. 1. 2 3
BCD Semiconductor Manufacturing Limited
Data Sheet SINGLE PHASE HALL EFFECT LATCH Absolute Maximum Ratings (Note 1)
(TA=25oC)
Parameter Supply Voltage Magnetic Flux Density Continuous Output Current Hold Peak (start up) Power Dissipation Die to atmosphere Thermal Resistance Die to package case Storage Temperature ESD (Machine Model) ESD (Human Body Model) PD JA JC TSTG IO Symbol VCC B Value 20 Unlimited 250 300 600 550 227 49 -50 to 150 600 6000 Unit V Gauss mA mA mA mW
oC/W o
AH477A
C/W
oC
V V
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. "Absolute Maximum Ratings" for extended period may affect device reliability.
Recommended Operating Conditions
(TA=25oC)
Parameter Supply Voltage Frequency (PWM Power) Ambient Temperature Symbol VCC f TA Min 3.5 0.1 -20 Max 18 25 85 Unit V kHz
o
C
Oct. 2009 Rev. 1. 2 4
BCD Semiconductor Manufacturing Limited
Data Sheet SINGLE PHASE HALL EFFECT LATCH Electrical Characteristics
(TA=25oC, VCC=14V, unless otherwise specified)
Parameter Output Saturation Voltage (Sink) Output Saturation Voltage (Drive) Supply Current Output Rise Time Output Fall Time VSAT ICC tr tf Symbol Test Condition VCC=14V, IO=200mA VCC=14V, IO=200mA VCC=20V, Output Open RL=820, CL=20pF RL=820, CL=20pF VCC1.3 Min Typ 0.45 VCC1.0 13.5 0.5 0.5 Max 0.65 VCC 16 1.0 1.0 Unit V V mA s s
AH477A
Magnetic Characteristics
(TA=25oC)
Parameter Operating Point Releasing Point Hysteresis Symbol BOP BRP BHYS Grade A B A B -70 -100 70 Min 5 Typ Max 70 100 -5 Unit Gauss Gauss Gauss
Test Circuit
AH477A
S
Marking Side
VCC
VCC
DO DOB GND
1
2
3
4
C1 0.1F
820
N
Oct. 2009 Rev. 1. 2 5
BCD Semiconductor Manufacturing Limited
Data Sheet SINGLE PHASE HALL EFFECT LATCH Magnetic Hysteresis Characteristics AH477A
14
14
12
12
10
10
DO Output (V)
DOB Output (V)
-100 -50 0 50 100
8
8
6
6
4
4
2
2
0
0 -100 -50 0 50 100
Magnetism (GS)
Magnetism (GS)
Figure 4. DO Output vs. Magnetism
Figure 5. DOB Output vs. Magnetism
Typical Performance Characteristics
16 14
20
16 12 10
ICC (mA)
8 6 4
ICC (mA)
12
8
4 2 0
TA=25 C
0 2 4 6 8 10 12 14 16 18 20 0 -20 -10 0 10 20 30 40 50
o
VCC=14V
60
70
80
VCC (V)
TA ( C)
O
Figure 6. Supply Current vs. Supply Voltage
Figure 7. Supply Current vs. Ambient Temperature
Oct. 2009 Rev. 1. 2 6
BCD Semiconductor Manufacturing Limited
Data Sheet SINGLE PHASE HALL EFFECT LATCH Typical Performance Characteristics (Continued) AH477A
100 80 60
100 80 60
BOP/BRP/BHYS (GS)
BOP/BRP/BHYS (GS)
40 20 0 -20 -40 -60 -80
40 20 0 -20 -40 -60
BOP BRP BHYS
BOP BRP BHYS
TA=25 C
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
o
-80 -100 -20 -10 0 10 20 30
O
VCC=14V
40 50 60 70 80
-100
VCC (V)
TA ( C)
Figure 8. BOP/BRP/BHYS vs. Supply Voltage
Figure 9. BOP/BRP/BHYS vs. Ambient Temperature
1200
1000 900
1000
800 700
800
600
VSAT_Up VSAT_Down
VSAT (mV)
VSAT (V)
600 500 400 300
Driver Sink
400
200
TA=25 C
O
200 100
IO=200mA
-20 0 20 40 60 80
0
50
75
100
125
150
175
200
225
250
275
300
0
IO (mA)
TA ( C)
o
Figure 10. VSAT vs. IO
Figure 11. VSAT vs. Ambient Temperature
Oct. 2009 Rev. 1. 2 7
BCD Semiconductor Manufacturing Limited
Data Sheet SINGLE PHASE HALL EFFECT LATCH Typical Performance Characteristics (Continued) AH477A
800
600
PD (mW)
400
200
0 -25
0
25
50
75
100
125
150
TA ( C)
o
Figure 12. PD vs. Ambient Temperature
Typical Application
AH477A
VCC DO DOB GND
1
VCC
D1
2
3
4
C1 0.1F
COIL
Figure 13. Typical Application Circuit
Oct. 2009 Rev. 1. 2 8
BCD Semiconductor Manufacturing Limited
Data Sheet SINGLE PHASE HALL EFFECT LATCH Mechanical Dimensions TO-94
45 TYP
AH477A
Unit: mm(inch)
0.500(0.020) 0.700(0.028) 1.520(0.059) 1.720(0.067) 0.700(0.028) 0.900(0.035) 1.720(0.068) 2.020(0.080) 1.100(0.043) 1.400(0.055) Package Sensor Location (For Hall IC)
3.780(0.149) 4.080(0.161)
4.980(0.196) 5.280(0.208)
0.360(0.014) 0.510(0.020)
0.380(0.015) 0.550(0.022)
3.450(0.136) 3.750(0.148)
0.360(0.014) 0.500(0.020)
14.000(0.550) 15.300(0.602)
1.270(0.050) TYP 3.710(0.146) 3.910(0.154)
Oct. 2009 Rev. 1. 2 9
BCD Semiconductor Manufacturing Limited
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
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