BCD AH477A Single phase hall effect latch Datasheet

Data Sheet
SINGLE PHASE HALL EFFECT LATCH
AH477A
General Description
Features
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.
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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.
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
The AH477A is available in TO-94 (SIP-4L) package.
TO-94
Figure 1. Package Type of AH477A
Oct. 2009 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
1
Data Sheet
SINGLE PHASE HALL EFFECT LATCH
AH477A
Pin Configuration
Z4 Package
(TO-94)
4
GND
3
2
DOB
DO
1
VCC
Figure 2. Pin Configuration of AH477A (Front View)
Pin Description
Pin Number
Pin Name
Function
1
VCC
Supply voltage
2
DO
Output 1
3
DOB
Output 2
4
GND
Ground
Oct. 2009 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
2
Data Sheet
SINGLE PHASE HALL EFFECT LATCH
AH477A
Functional Block Diagram
VCC
1
VCC
Regulator
2
Hall
Sensor
Amplifier
Schmitt
Trigger
PreDriver
DO
VCC
3
DOB
4
GND
Figure 3. Functional Block Diagram of AH477A
Ordering Information
AH477A
-
Circuit Type
G1: Green
Package
Z4: TO-94 (SIP-4L)
Magnetic Characteristics
A: 5 to 70 Gauss
B: 100 Gauss
Package
Temperature Range
TO-94
-20 to 85oC
Part Number
Marking ID
Packing Type
AH477AZ4-AG1
477AZ4-G1
Bulk
AH477AZ4-BG1
477AZ4-G1
Bulk
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
BCD Semiconductor Manufacturing Limited
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Data Sheet
SINGLE PHASE HALL EFFECT LATCH
AH477A
Absolute Maximum Ratings (Note 1)
(TA=25oC)
Parameter
Symbol
Value
Unit
VCC
20
V
B
Unlimited
Gauss
250
mA
300
mA
600
mA
PD
550
mW
Die to atmosphere
θJA
227
oC/W
Die to package case
θJC
49
TSTG
-50 to 150
oC
ESD (Machine Model)
600
V
ESD (Human Body Model)
6000
V
Supply Voltage
Magnetic Flux Density
Continuous
Output Current
IO
Hold
Peak (start up)
Power Dissipation
Thermal Resistance
Storage Temperature
o
C/W
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
Min
Max
Unit
VCC
3.5
18
V
f
0.1
25
kHz
TA
-20
85
Oct. 2009 Rev. 1. 2
o
C
BCD Semiconductor Manufacturing Limited
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Data Sheet
SINGLE PHASE HALL EFFECT LATCH
AH477A
Electrical Characteristics
(TA=25oC, VCC=14V, unless otherwise specified)
Parameter
Symbol
Output Saturation Voltage (Sink)
Test Condition
Min
Typ
Max
Unit
0.45
0.65
V
VCC1.3
VCC1.0
VCC
V
VCC=20V, Output Open
13.5
16
mA
VCC=14V, IO=200mA
VSAT
Output Saturation Voltage (Drive)
Supply Current
ICC
VCC=14V, IO=200mA
Output Rise Time
tr
RL=820Ω, CL=20pF
0.5
1.0
µs
Output Fall Time
tf
RL=820Ω, CL=20pF
0.5
1.0
µs
Magnetic Characteristics
(TA=25oC)
Parameter
Symbol
Operating Point
BOP
Releasing Point
BRP
Hysteresis
Grade
Min
A
5
Typ
Max
Unit
70
B
Gauss
100
A
-70
B
-100
BHYS
-5
Gauss
70
Gauss
Test Circuit
AH477A
VCC
S
1
Marking Side
DO DOB GND
2
3
4
VCC
C1
0.1µF
820Ω
N
Oct. 2009 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Data Sheet
SINGLE PHASE HALL EFFECT LATCH
AH477A
14
14
12
12
10
10
DOB Output (V)
DO Output (V)
Magnetic Hysteresis Characteristics
8
6
8
6
4
4
2
2
0
-100
-50
0
50
0
100
-100
-50
Magnetism (GS)
0
50
100
Magnetism (GS)
Figure 4. DO Output vs. Magnetism
Figure 5. DOB Output vs. Magnetism
Typical Performance Characteristics
20
16
14
16
12
ICC (mA)
ICC (mA)
10
8
6
12
8
4
4
0
VCC=14V
o
TA=25 C
2
0
2
4
6
8
10
12
14
16
18
0
20
-20
-10
0
10
20
30
40
50
60
70
80
O
VCC (V)
TA ( C)
Figure 7. Supply Current vs. Ambient Temperature
Figure 6. Supply Current vs. Supply Voltage
Oct. 2009 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
6
Data Sheet
SINGLE PHASE HALL EFFECT LATCH
AH477A
100
100
80
80
60
60
40
20
BOP
0
BRP
BOP/BRP/BHYS (GS)
BOP/BRP/BHYS (GS)
Typical Performance Characteristics (Continued)
BHYS
-20
20
BOP
0
BRP
BHYS
-20
-40
-40
-60
-60
o
TA=25 C
-80
-100
40
2
3
4
5
6
7
8
VCC=14V
-80
-100
9 10 11 12 13 14 15 16 17 18 19 20 21 22
-20
-10
0
10
20
30
40
50
60
70
80
O
TA ( C)
VCC (V)
Figure 8. BOP/BRP/BHYS vs. Supply Voltage
Figure 9. BOP/BRP/BHYS vs. Ambient Temperature
1000
1200
900
1000
800
700
VSAT (mV)
VSAT (V)
800
VSAT_Up
600
VSAT_Down
400
600
Driver
Sink
500
400
300
200
O
200
TA=25 C
IO=200mA
100
0
50
75
100
125
150
175
200
225
250
275
0
300
IO (mA)
-20
0
20
40
60
80
o
TA ( C)
Figure 10. VSAT vs. IO
Figure 11. VSAT vs. Ambient Temperature
Oct. 2009 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Data Sheet
SINGLE PHASE HALL EFFECT LATCH
AH477A
Typical Performance Characteristics (Continued)
800
PD (mW)
600
400
200
0
-25
0
25
50
75
100
125
150
o
TA ( C)
Figure 12. PD vs. Ambient Temperature
Typical Application
AH477A
VCC
1
VCC
DO DOB GND
2
3
4
D1
C1
0.1µF
COIL
Figure 13. Typical Application Circuit
Oct. 2009 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
8
Data Sheet
SINGLE PHASE HALL EFFECT LATCH
AH477A
Mechanical Dimensions
TO-94
0.500(0.020)
0.700(0.028)
Unit: mm(inch)
45 °TYP
3.780(0.149)
4.080(0.161)
1.520(0.059)
1.720(0.067)
0.700(0.028)
0.900(0.035)
4.980(0.196)
5.280(0.208)
0.360(0.014)
0.510(0.020)
1.720(0.068)
2.020(0.080)
1.100(0.043)
1.400(0.055)
0.380(0.015)
0.550(0.022)
Package Sensor Location
(For Hall IC)
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
BCD Semiconductor Manufacturing Limited
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