Diodes AH9479/80/81 Manuel d'utilisateur télécharger pdf

Data Sheet

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

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

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

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