Diodes AH277AZ4-CE1 Complementary output hall effect latch Datasheet

Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
General Description
Features
The AH277A is an integrated Hall sensor with output
driver designed for electronic commutation of brushless DC motor applications. The device includes an onchip Hall sensor for magnetic sensing, an amplifier
that amplifies the Hall voltage, a Schmitt trigger to
provide switching hysteresis for noise rejection, a temperature compensation circuit to compensate the temperature drift of Hall sensitivity and two
complementary open-collector drivers for sinking
large load current. It also includes an internal band-gap
regulator which is used to provide bias voltage for
internal circuits.
·
·
·
·
·
·
·
AH277A
On-Chip Hall Sensor
3.5V to 16V Supply Voltage
400mA (avg) Output Sink Current
Reversed Supply Voltage Protection
-20oC to 85oC Operating Temperature
Low Profile TO-94 (SIP-4L) Package
ESD Rating: 300V (Machine Model)
Applications
·
·
·
·
Placing the device in a variable magnetic field, if the
magnetic flux density is larger than threshold BOP, the
pin DO will be turned low (on) and pin DOB will be
turned high (off). This output state is held until the
magnetic flux density reverses and falls below BRP,
then causes DO to be turned high (off) and DOB
turned low (on).
Dual-Coil Brushless DC Motor
Dual-Coil Brushless DC Fan
Revolution Counting
Speed Measurement
AH277A is available in TO-94 (SIP-4L) package.
TO-94
Figure 1. Package Type of AH277A
Oct. 2009 Rev. 1. 6
BCD Semiconductor Manufacturing Limited
1
Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
AH277A
Pin Configuration
Z4 Package
(TO-94)
4
GND
3
2
DOB
DO
1
VCC
Figure 2. Pin Configuration of AH277A (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. 6
BCD Semiconductor Manufacturing Limited
2
Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
AH277A
Functional Block Diagram
VCC
DO
1
2
Temperature
Compensation
Regulator
4
Hall
Sensor
Schmitt
Trigger
Amplifier
GND
Output
Driver
3
DOB
Figure 3. Functional Block Diagram of AH277A
Ordering Information
AH277A
E1: Lead Free
G1: Green
Circuit Type
Magnetic Characteristics
A: 10 to 50Gauss
B: 5 to 70Gauss
C: 100Gauss
Package
Z4: TO-94 (SIP-4L)
Package
TO-94
Temperature
Range
-20 to
85o
C
Part Number
Lead Free
Marking ID
Green
Lead Free
Green
Packing
Type
AH277AZ4-AE1
AH277AZ4-AG1
AH277A
AH277A-G1
Bulk
AH277AZ4-BE1
AH277AZ4-BG1
AH277A
AH277A-G1
Bulk
AH277AZ4-CE1
AH277AZ4-CG1
AH277A
AH277A-G1
Bulk
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green package.
Oct. 2009 Rev. 1. 6
BCD Semiconductor Manufacturing Limited
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Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
AH277A
Absolute Maximum Ratings (Note 1)
(TA=25oC)
Parameter
Symbol
Value
Unit
Supply Voltage
VCC
20
V
Reverse Protection Voltage
VRCC
-20
V
B
Unlimited
Gauss
400
mA
600
mA
800
mA
PD
550
mW
Die to atmosphere
θJA
227
Die to package case
θJC
49
TSTG
-50 to 150
Magnetic Flux Density
Continuous
Output Current
IO
Hold
Peak (start up)
Power Dissipation
Thermal Resistance
Storage Temperature
o
C/W
oC/W
o
C
ESD (Machine Model)
300
V
ESD (Human Body Model)
2000
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
Ambient Temperature
Symbol
Min
Max
VCC
3.5
16
V
TA
-20
85
o
Oct. 2009 Rev. 1. 6
Unit
C
BCD Semiconductor Manufacturing Limited
4
Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
AH277A
Electrical Characteristics
(TA=25oC, VCC=14V, unless otherwise specified)
Parameter
Symbol
VSAT
Output Saturation Voltage
Test Condition
Min
Typ
VCC=3.5V, IO=100mA
0.4
IO=400mA
0.35
Output Leakage Current
IOL
VCE=16V
Supply Current
ICC
VCC=16V, Output Open
Max
Unit
V
0.6
V
0.1
10
µA
12
16
mA
Output Rise Time
tr
RL=820Ω, CL=20pF
3.0
10
µs
Output Fall Time
tf
RL=820Ω, CL=20pF
0.3
1.5
µs
Switch Time Differential
∆t
RL=820Ω, CL=20pF
3.0
10
µs
Output Zener Breakdown Voltage
VZ
55
V
Magnetic Characteristics
(TA=25oC)
Parameter
Symbol
BOP
Operating Point
Grade
Min
Typ
Max
Unit
A
10
30
50
Gauss
B
5
70
Gauss
100
Gauss
-10
Gauss
-5
Gauss
C
BRP
Releasing Point
Hysteresis
A
-50
B
-70
C
-100
-30
Gauss
60
BHYS
Gauss
VDO (V)
Off-state
High
BHYS
Turn off
Turn on
Low
VSAT
On-state
N
BRP
0
BOP
S
Magnetic Flux Density (Gauss)
Oct. 2009 Rev. 1. 6
BCD Semiconductor Manufacturing Limited
5
Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
AH277A
Magnetic Characteristics (Continued)
+14V
AH277A
S
Marking Side
VCC
DO
1
2
DOB GND
4
3
DO (VOUT1)
R1
820Ω
R2
N
DOB (VOUT2)
820Ω
C1
C2
20pF 20pF
Figure 4. Basic Test Circuit
DO (V)
DOB (V)
16
16
VCC
14
14
12
12
10
10
8
8
6
6
4
4
2
-40
-20
0
VSAT
20
2
VSAT
40
-40
Magnetic Flux Density B (Gauss)
VCC
-20
0
20
40
Magnetic Flux Density B (Gauss)
Figure 5. VDO vs. Magnetic Flux Density
Figure 6. VDOB vs. Magnetic Flux Density
Oct. 2009 Rev. 1. 6
BCD Semiconductor Manufacturing Limited
6
Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
AH277A
Typical Performance Characteristics
14
60
12
50
40
BOP, BRP, BHY (Gauss)
10
ICC (mA)
8
6
o
TA= -20 C
o
TA= 0 C
4
o
20
BOP
BRP
BHYS
10
0
TA=25 C
-10
TA=80 C
-20
o
2
0
30
-30
0
5
10
15
20
25
0
5
10
15
20
25
VCC (V)
VCC (V)
Figure 7. ICC vs. VCC
Figure 8. BOP/BRP/BHYS vs. VCC
800
60
50
600
30
PD (mW)
BOP, BRP, BHYS (Gauss)
40
20
BOP
BRP
BHYS
10
0
400
200
-10
-20
-20
-10
0
10
20
30
40
50
60
70
80
90
0
-25
100 110
o
0
25
50
75
100
125
150
o
TA ( C)
TA ( C)
Figure 9. BOP/BRP/BHYS vs. Ambient Temperature
Figure 10. PD vs. Ambient Temperature
Oct. 2009 Rev. 1. 6
BCD Semiconductor Manufacturing Limited
7
Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
AH277A
Typical Performance Characteristics (Continued)
14
600
IO=300mA
IO=350mA
IO=400mA
VCC=14V
550
12
500
VSAT (mV)
ICC (mA)
450
10
VCC=3.5V
VCC=14V
VCC=20V
8
6
-20
0
400
350
300
250
20
40
60
200
80
-20
0
20
o
40
60
80
o
TA ( C)
TA ( C)
Figure 11. Supply Current vs. Ambient Temperature
Figure 12. Saturation Voltage vs. Ambient Temperature
Typical Applications
D1
AH277A
VCC
DO
1
2
COIL1
COIL2
R1
470
R2
470
DOB GND
4
3
VCC
+
C1
2.2µF
+
C2
2.2µF
Figure 13. Typical Application Circuit with D1(Note 2)
Note 2: AH277A has Reversed Supply Voltage Protection. For DC fan application, sometimes need to test power
reverse connection condition. The internal diode only protects chip-side but not for coil-side. It is recommended to
add one external diode D1 in application to block the reverse current from coil-side as shown in Figure 13.
Oct. 2009 Rev. 1. 6
BCD Semiconductor Manufacturing Limited
8
Data Sheet
COMPLEMENTARY OUTPUT HALL EFFECT LATCH
AH277A
Mechanical Dimensions
TO-94
0.500(0.020)
0.700(0.028)
3.780(0.149)
Unit: mm(inch)
45°TYP
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)
1.850(0.073)
1.250(0.050)
Package Sensor Location
0.380(0.015)
0.550(0.022)
3.450(0.136)
3.750(0.148)
(For Hall IC)
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. 6
BCD Semiconductor Manufacturing Limited
9
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