Diodes AH9479, AH9480, AH9481 User Manual

Single Phase Low Noise Smart Motor Driver AH9479/80/81

Data Sheet

General Description

The AH9479/80/81 is a single chip solution for driving single coil brushless DC motors. It combines

a motor driver with a high sensitivity Hall sensor, which simplifies the PCB design and makes the fabrication of small-size motors possible.

The AH9480 has an open-drain tachometer output FG that follows the Hall sensor latching output. The AH9481 has an open-drain rotation detection output RD that is active low when the motor is spinning and goes high when blocked.

When there is no motion about 0.4 second, the IC will automatically detect the locked rotor conditions, and enter protection mode, shutting off the motor driver for 4 seconds. Then, the IC will turn on the motor driver for 0.4 second to detect whether there is rotation condition, if fails, the IC will shut off motor driver for four seconds again. This sequence will be repeated until rotation condition is detected, and the IC enters normal operation. This feature can effectively prevent the IC from overheating and damage due to long-time locked rotor condition.

“Soft-switch” is used to reduce the vibration and acoustic noise. Thermal-shutdown protection ensures that the motor driver operates under specified temperature ranges.

The AH9479 is packaged in TO-94, and the AH9480/81 is packaged in TO-95 and MSOP-8.

Features

• Full Bridge Driver

• High Sensitivity Integrated Hall Sensor

• Soft-switching for Low Noise

• Low Supply Voltage: 2.5V

• Locked Rotor Protection and Auto-restart

• Thermal Protection

• Output Over-current Protection

• Short Circuit Protection

• Tachometer Output Signal (AH9480)

• Alarm Output Signal (AH9481)

Applications

• 5V/12V Low Noise BLDC Cooling Fans

• L o w Vo l t a g e / L o w P o w e r B L D C M o t o r s

• Notebook DC Fans / Blowers

• Automotive Low Noise Climate Control Fans

• Micro-motors

TO-94 TO-95 MSOP-8

Figure 1. Package Types of AH9479/80/81

Mar. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

Single Phase Low Noise Smart Motor Driver AH9479/80/81

Pin Configuration

Z4 Package Z5 Package (TO-94) (TO-95)

4 3 2 1

(For AH9479) (For AH9480/81)

GND

OUT2

OUT1

VCC

5 4

3 2 1

GND OUT2

OUT1

VCC FG/RD

NC

FG/RD

GND

OUT1

M8 Package

(MSOP-8)

1

2

3

4

(For AH9480/81)

8

NC

7

VCC OUT2

6

5

GND

Figure 2. Pin Configuration of AH9479/80/81

Pin Description

Pin Number

TO-94 TO-95 MSOP-8

1 2

1 2 7

2 3 4

3 4 6

4 5 3, 5

1, 8

Name

FG/RD

Frequency generator (rotation detection) open drain output

VCC Power supply pin

OUT1 Output pin 1

OUT2 Output pin 2

GND Ground pin

NC No connection

Function

Mar. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

Single Phase Low Noise Smart Motor Driver AH9479/80/81

Functional Block Diagram

A (B) {C} A for TO-94 B for TO-95 C for MSOP-8

Figure 3. Functional Block Diagram of AH9479/80/81

Mar. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

Single Phase Low Noise Smart Motor Driver AH9479/80/81

Ordering Information

AH94 -

Package

Temperature

Circuit Type

79: AH9479 80: AH9480

Package Z4: TO-94 Z5: TO-95 M8 : MSOP-8

Range

Output

Signal

Part Number Marking ID Packing Type

G1: Green

TR: Tape & Reel Blank: Bulk

TO-94 AH9479Z4-G1 9479Z4-G1 Bulk

TO-95

-40 to 85°C

MSOP-8

FG AH9480Z5-G1 9480Z5-G1 Bulk

RD AH9481Z5-G1 9481Z5-G1 Bulk

FG AH9480M8TR-G1 9480M8-G1 Tape & Reel

RD AH9481M8TR-G1 9481M8-G1 Tape & Reel

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

Mar. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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Data Sheet

Single Phase Low Noise Smart Motor Driver AH9479/80/81

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Supply Voltage VCC 18 V

Peak Output Current I

Continuous Output Current I

FG/RD Pull-up Voltage VFG/VRD 18 V

FG/RD Output Current IFG/IRD 10 mA

Power Dissipation PD

Operating Ambient Temperature TA -40 to 85 ºC

Storage Temperature T

Thermal Resistance (Junction to Ambient)

ESD (Human Body Model) ESD 6000 V

ESD (Machine Model) ESD 200 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. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.

500 mA

OUT_P

300 mA

OUT_C

TO-94 550

TO-95 600

MSOP-8 585

-55 to 150 ºC

STG

TO-94 227

θ

JA

TO-95 208

MSOP-8 214

mW

ºC/W

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Supply Voltage VCC 2.5 16 V

Operating Ambient Temperature TA -40 85 ºC

Mar. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited

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