Diodes AH477A User Manual

Data Sheet

SINGLE PHASE HALL EFFECT LATCH AH477A

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 B

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 B

turned to drive and DOB turned to sink.

The AH477A is available in TO-94 (SIP-4L) package.

then causes DO to be

RP,

OP

, the

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

o

· Operating Temperature: -20

· Low Profile TO-94 (SIP-4L) Package

· ESD Rating: 6000V (Human Body Model)

· Suitable for PWM Power Supply Control Speed

C to 85oC

Applications

· Single-coil Brushless DC Motor

· Single-coil Brushless DC Fan

TO-94

Figure 1. Package Type of AH477A

Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

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Data Sheet

SINGLE PHASE HALL EFFECT LATCH AH477A

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 AH477A (Front View)

V

CC

Supply voltage

GND

DOB
DO

V

CC

Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

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Data Sheet

SINGLE PHASE HALL EFFECT LATCH AH477A

Functional Block Diagram

V

CC

1

V

CC

Regulator

2

DO

Hall

Sensor

Ordering Information

Circuit Type

Package

Z4: TO-94 (SIP-4L)

Amplifier

Figure 3. Functional Block Diagram of AH477A

AH477A

Schmitt

Trigger

-

Pre-

Driver

V

CC

G1: Green

Magnetic Characteristics
A: 5 to 70 Gauss
B: 100 Gauss

3

DOB

4

GND

Package Temperature Range Part Number Marking ID Packing Type

TO-94

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.

-20 to 85

o

C

AH477AZ4-AG1 477AZ4-G1 Bulk

AH477AZ4-BG1 477AZ4-G1 Bulk

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Data Sheet

SINGLE PHASE HALL EFFECT LATCH AH477A

Absolute Maximum Ratings (Note 1)

(T

=25oC)

A

Parameter Symbol Value Unit

Supply Voltage V

CC

20 V

Magnetic Flux Density B Unlimited Gauss

250 mA

Output Current

Continuous

Hold 300 mA

I

O

Peak (start up) 600 mA

Power Dissipation P

Die to atmosphere θ

D

JA

550 mW

227

o

C/W

Thermal Resistance

Die to package case θ

Storage Temperature T

JC

STG

49

-50 to 150

o

C/W

o

C

ESD (Machine Model) 600 V

ESD (Human Body Model) 6000 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

V

CC

Frequency (PWM Power) f 0.1 25 kHz

Ambient Temperature

T

A

Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

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3.5 18 V

-20 85

o

C

Data Sheet

SINGLE PHASE HALL EFFECT LATCH AH477A

Electrical Characteristics

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

Parameter Symbol Test Condition Min Typ Max Unit

Output Saturation Voltage (Sink)

V

Output Saturation Voltage (Drive)

VCC=14V, IO=200mA 0.45 0.65 V

SAT

=14V, IO=200mA VCC-

V

CC

1.3

VCC-

1.0

V

CC

V

Supply Current I

Output Rise Time tr R

Output Fall Time tf R

VCC=20V, Output Open 13.5 16 mA

CC

=820Ω, CL=20pF 0.5 1.0 µs

L

=820Ω, CL=20pF 0.5 1.0 µs

L

Magnetic Characteristics

(TA=25oC)

Parameter Symbol Grade Min Typ Max Unit

Operating Point

Releasing Point

Hysteresis B

B

B

OP

RP

HYS

A5 70

B 100

A-70 -5

B -100

70 Gauss

Test Circuit

AH477A

Gauss

Gauss

V

CC

S

DO DOB GND

12

4

3

Marking Side

V

CC

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

Magnetic Hysteresis Characteristics

14

12

10

8

6

DO Output (V)

4

2

0

-100 -50 0 50 100

Magnetism (GS)

Figure 4. DO Output vs. Magnetism

Typical Performance Characteristics

14

12

10

8

6

DOB Output (V)

4

2

0

-100 -50 0 50 100

Magnetism (GS)

Figure 5. DOB Output vs. Magnetism

16

14

12

10

8

(mA)

CC

I

6

4

2

0

0 2 4 6 8 10 12 14 16 18 20

TA=25oC

VCC (V)

Figure 6. Supply Current vs. Supply Voltage

20

16

12

(mA)

CC

I

8

4

0

-20-100 1020304050607080

VCC=14V

TA (OC)

Figure 7. Supply Current 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)

100

80

60

40

(GS)

20

HYS

/B

0

RP

/B

-20

OP

B

-40

-60

-80

-100
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

V

(V)

CC

Figure 8. BOP/BRP/B

1200

1000

800

(V)

600

SAT

V

400

200

0

50 75 100 125 150 175 200 225 250 275 300

V

SAT

V

SAT

vs. Supply Voltage Figure 9. BOP/BRP/B

HYS

_Up

_Down

IO (mA)

B

OP

B

RP

B

HYS

TA=25oC

TA=25OC

100

80

60

40

(GS)

20

HYS

/B

0

RP

/B

-20

OP

B

-40

-60

-80

-100

-20-10 0 1020304050607080

TA (OC)

vs. Ambient Temperature

HYS

1000

900

800

700

600

(mV)

500

SAT

V

400

300

200

100

0

-20 0 20 40 60 80

TA (oC)

B

OP

B

RP

B

HYS

VCC=14V

Driver
Sink

IO=200mA

Figure 10. V

SAT

vs. I

O

Figure 11. V

vs. Ambient Temperature

SAT

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

600

400

(mW)

D

P

200

0

-25 0 25 50 75 100 125 150

TA (oC)

Figure 12. PD vs. Ambient Temperature

Typical Application

AH477A

V

CC

DO DOB GND

12

V

CC

D1

C1

0.1µF

Figure 13. Typical Application Circuit

3

COIL

4

Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

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Data Sheet

SINGLE PHASE HALL EFFECT LATCH AH477A

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)

1.720(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)

0.380(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)

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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BCD Semiconductor Manufacturing Limited

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