Diodes AH276 User Manual

Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH276

General Description

The AH276 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).

AH276 is available in TO-94 (SIP-4L) package.

OP

, the

RP,

Features

· On-Chip Hall Sensor

· 3.5V to 16V Supply Voltage

· 350mA (avg) Output Sink Current

· Reversed Supply Voltage Protection

· Build in Over Temperature Protection Function

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 AH276

Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited

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Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH276

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 AH276 (Front View)

V

CC

Supply voltage

GND

DOB
DO

V

CC

Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited

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Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH276

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 AH276

Schmitt

Trigger

Over

Temperature

Protection

Output

Driver

AH276 -

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

o

-20 to 85

C

Lead Free Green Lead Free Green

AH276Z4-AE1 AH276Z4-AG1 AH276Z4-E1 AH276Z4-G1 Bulk

AH276Z4-BE1 AH276Z4-BG1 AH276Z4-E1 AH276Z4-G1 Bulk

AH276Z4-CE1 AH276Z4-CG1 AH276Z4-E1 AH276Z4-G1 Bulk

Part Number Marking ID

Packing

Typ e

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Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH276

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 550 mA

I

O

350 mA

Peak (start up) 750 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) 2500 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

Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited

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3.5 16 V

-20 85

o

C

Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH276

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

Thermal Protection Temperature TSD 178

Thermal Protection Hysteresis ∆TSD 40

VCC=3.5V, IO=100mA 0.3 V

SAT

=350mA 0.35 0.6 V

I

O

VCE=16V 0.1 10 µA

VCC=16V, Output Open 12 16 mA

=820Ω, CL=20pF 3.0 10 µs

L

=820Ω, CL=20pF 0.3 1.5 µs

L

=820Ω, CL=20pF 3.0 10 µs

L

Z

55 V

o

C

o

C

Magnetic Characteristics

(TA=25oC)

Parameter Symbol Grade Min Typ Max Unit

A10 50Gauss

Operating Point

B

OP

B 5 70 Gauss

C 100 Gauss

A-50 -10Gauss

Releasing Point

B

RP

B -70 -5 Gauss

C -100 Gauss

Hysteresis B

High

Turn off Turn on

HYS

Off-state

V

SAT

VDO (V)

B

HYS

On-state

B

RP

Magnetic Flux Density (Gauss)

0

B

OP

75 Gauss

Low

SN

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Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH276

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

CC

12

R1

820Ω

R2

820Ω

Figure 4. Basic Test Circuit

V

SAT

V

SAT

-40 -20 0 20 40

AH276

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

OUT2

)

)

V

CC

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 AH276

Typical Performance Characteristics

14

13

12

11

10

(mA)

9

CC

I

8

7

6

5

2 4 6 8 10 12 14 16 18 20

Ta=-25OC

Ta=-0OC

Ta=+25OC

Ta=+85OC

VCC (V)

Figure 7. I

CC

vs. V

CC

100

80

60

40

20

(Gauss)

HYS

0

/B

RP

/B

-20

OP

B

-40

-60

-80
4 6 8 101214161820

B
B
B

Ta=25OC

OP

RP

HYS

VCC (V)

Figure 8. B

OP/BRP/BHYS

vs. V

CC

75

50

25

(Gauss)

HYS

0

/B

RP

/B

OP

B

-25

-50

-20 0 20 40 60 80

Figure 9. BOP/BRP/B

TA (OC)

vs. Ambient Temperature

HYS

B
B
B

TA=+25OC

OP

RP

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 AH276

Typical Performance Characteristics (Continued)

14

12

10

(mA)

CC

I

8

6

-20 0 20 40 60 80

TA (OC)

Figure 11. ICC vs. Ambient Temperature

Typical Applications

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

D1

600

5

IO=100mA

500

400

(mV)

300

SAT

V

200

100

-20 0 20 40 60 80

IO=200mA
IO=300mA
IO=350mA
IO=400mA

Figure 12. V

SAT

TA(OC)

vs. Ambient Temperature

AH276

COIL1 COIL2

V

CC

DO DOB GND

12

V

CC

4

3

R1

470

C1

2.2µF

++

R2

470

C2

2.2µF

Figure 12. Typical Application Circuit

Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited

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Data Sheet

COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH276

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)

0.149)

3.780(

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)

Nov. 2009 Rev. 1. 4 BCD Semiconductor Manufacturing Limited

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BCD Semiconductor Manufacturing Limited

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