Diodes AH277A User Manual

Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A

General Description

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.

Placing the device in a variable magnetic field, if the
magnetic flux density is larger than threshold B

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 B

then causes DO to be turned high (off) and DOB
turned low (on).

AH277A is available in TO-94 (SIP-4L) package.

OP

, the

RP,

Features

· On-Chip Hall Sensor

· 3.5V to 16V Supply Voltage

· 400mA (avg) Output Sink Current

· Reversed Supply Voltage Protection

o

· -20

· Low Profile TO-94 (SIP-4L) Package

· ESD Rating: 300V (Machine Model)

C to 85oC Operating Temperature

Applications

· Dual-Coil Brushless DC Motor

· Dual-Coil Brushless DC Fan

· Revolution Counting

· Speed Measurement

TO-94

Figure 1. Package Type of AH277A

Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A

Pin Configuration

Z4 Package

(TO-94)

Pin Description

Pin Number Pin Name Function

1

2 DO Output 1

3 DOB Output 2

4 GND Ground

4

3

2

1

Figure 2. Pin Configuration of AH277A (Front View)

V

CC

Supply voltage

GND

DOB
DO

V

CC

Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A

Functional Block Diagram

V

CC

1

Regulator

Temperature

Compensation

DO

2

4

GND

Hall

Sensor

Ordering Information

Circuit Type

Package

Z4: TO-94 (SIP-4L)

Amplifier

Figure 3. Functional Block Diagram of AH277A

Schmitt

Trigger

Output

Driver

AH277A -

E1: Lead Free
G1: Green

Magnetic Characteristics
A: 10 to 50Gauss
B: 5 to 70Gauss
C: 100Gauss

3

DOB

Package

TO-94

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.

Temperature

Range

-20 to 85

o

C

Lead Free Green Lead Free Green

AH277AZ4-AE1 AH277AZ4-AG1 AH277A AH277A-G1 Bulk

AH277AZ4-BE1 AH277AZ4-BG1 AH277A AH277A-G1 Bulk

AH277AZ4-CE1 AH277AZ4-CG1 AH277A AH277A-G1 Bulk

Part Number Marking ID

Packing

Typ e

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Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A

Absolute Maximum Ratings (Note 1)

(T

=25oC)

A

Parameter Symbol Value Unit

Supply Voltage V

Reverse Protection Voltage V

CC

RCC

20 V

-20 V

Magnetic Flux Density B Unlimited Gauss

Output Current

Continuous

Hold 600 mA

I

O

400 mA

Peak (start up) 800 mA

Power Dissipation P

Die to atmosphere θJA 227

D

550 mW

o

C/W

Thermal Resistance

Die to package case θJC 49

Storage Temperature T

STG

-50 to 150

o

C/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 Symbol Min Max Unit

Supply Voltage

Ambient Temperature

V

CC

T

A

Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

4

3.5 16 V

-20 85

o

C

Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A

Electrical Characteristics

(TA=25oC, VCC=14V, unless otherwise specified)

Parameter Symbol Test Condition Min Typ Max Unit

Output Saturation Voltage

Output Leakage Current I

Supply Current I

V

OL

CC

Output Rise Time tr R

Output Fall Time tf R

Switch Time Differential ∆tR

Output Zener Breakdown Voltage V

VCC=3.5V, IO=100mA 0.4 V

SAT

I

=400mA

O

VCE=16V

VCC=16V, Output Open

=820Ω, CL=20pF

L

=820Ω, CL=20pF

L

=820Ω, CL=20pF

L

Z

0.35 0.6 V

0.1 10

12 16 mA

3.0 10

0.3 1.5

3.0 10

55 V

µA

µs

µs

µs

Magnetic Characteristics

(TA=25oC)

Parameter Symbol Grade Min Typ Max Unit

A103050Gauss

Operating Point

Releasing Point

Hysteresis B

B

B

OP

RP

HYS

B 5 70 Gauss

C 100 Gauss

A -50 -30 -10 Gauss

B -70 -5 Gauss

C -100 Gauss

60 Gauss

VDO (V)

Off-state

High

B

Turn off Turn on

V

SAT

HYS

Low

On-state

B

RP

0

B

OP

SN

Magnetic Flux Density (Gauss)

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Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A

Magnetic Characteristics (Continued)

S

Marking Side

N

DO (V)

V

CC

-40 -20 0 20 40

Magnetic Flux Density B (Gauss)

16

14

12

10

8

6

4

2

+14V

V

12

R1

820Ω

R2

820Ω

Figure 4. Basic Test Circuit

V

SAT

V

SAT

-40 -20 0 20 40

AH277A

CC

DO DOB GND

4

3

C1 C2

20pF 20pF

DOB (V)

16

14

12

10

8

6

4

2

Magnetic Flux Density B (Gauss)

DO (V

DOB (V

OUT1

V

CC

OUT2

)

)

Figure 5. V

vs. Magnetic Flux Density

DO

Figure 6. V

vs. Magnetic Flux Density

DOB

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Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A

Typical Performance Characteristics

14

12

10

8

(mA)

CC

6

I

4

2

0

0 5 10 15 20 25

T

= -20oC

A

T

= 0oC

A

T

=25oC

A

T

=80oC

A

VCC (V)

Figure 7. I

CC

vs. V

CC

60

50

40

30

(Gauss)

20

HY

, B

RP

, B

OP

B

-10

-20

-30

B

10

0

OP

B

RP

B

HYS

0 5 10 15 20 25

VCC (V)

Figure 8. B

OP/BRP/BHYS

vs. V

CC

60

50

40

30

(Gauss)

20

HYS

, B

10

RP

, B

0

OP

B

-10

-20

-20-100 102030405060708090100110

B

OP

B

RP

B

HYS

TA (oC)

Figure 9. BOP/BRP/B

vs. Ambient Temperature

HYS

800

600

400

(mW)

D

P

200

0

-25 0 25 50 75 100 125 150

TA (oC)

Figure 10. PD vs. Ambient Temperature

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Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A

Typical Performance Characteristics (Continued)

14

12

10

(mA)

CC

I

8

6

VCC=3.5V
VCC=14V
VCC=20V

-20 0 20 40 60 80

TA (oC)

600

550

500

450

400

(mV)

SAT

V

350

300

250

200

IO=300mA
IO=350mA
IO=400mA

V

=14V

CC

-20 0 20 40 60 80

TA (oC)

Figure 11. Supply Current vs. Ambient Temperature Figure 12. Saturation Voltage vs. Ambient Temperature

Typical Applications

D1

AH277A

COIL1 COIL2

V

CC

DO DOB GND

12

V

CC

4

3

R1

470

C1

2.2µF

++

R2

470

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.

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Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A

Mechanical Dimensions

Unit: mm(inch)TO-94

0.500(0.020)

0.700(0.028)

1.520(0.059)

1.720(0.067)

0.700(0.028)

0.900(0.035)

1.250(0.050)

Package Sensor Location

(For Hall IC)

14.000(0.550)

15.300(0.602)

3.780(0.149)

4.080(0.161)

4.980(0.196)

5.280(0.208)

1.850(0.073)

0.380(0.015)

0.550(0.022)

45°TYP

0.360(0.014)

0.510(0.020)

3.450(0.136)

3.750(0.148)

0.360(0.014)

0.500(0.020)

1.270(0.050) TYP

3.710(0.146)

3.910(0.154)

Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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BCD Semiconductor Manufacturing Limited

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