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The AH5775 is a single chip solution for driving single-coil brushless direct current (BLDC) fans and motors. The integrated full-bridge driver output stage uses soft switching to minimize audible switching noise and electromagnetic interference (EMI) providing a low noise solution.
To simplify system circuit and minimize external components, the device integrates a stable high sensitivity Hall-Effect sensor, voltage and temperature compensated internal references, amplifiers and the output H-bridge power switches with low RDSON.
To help protect the motor coil, the AH5775 provides Rotor Lock Protection which shuts down the output drive if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. In case of over voltage, the device shuts down the output drive and enters standby mode to help prevent over voltage stress on the coil. Over temperature shutdown provides thermal protection for the device.
The AH5775 is available in TO94 package.
5V / 12V / 15V Min. BLDC Cooling Fans
Netbook/ Notebook and Desktop BLDC Fans
Instruments Cooling Fans
Medium Voltage/Low Power BLDC Motors
Supports Single-Phase Full Wave BLDC Fan/Motor Drive
Built-In Hall Effect Sensor and Input Amplifier
Operating Voltage: 2.5V to 16V
Soft Switching for Low Noise DC Fan Motor Applications
Rotor Lock Protection (Lock detection, output shutdown and automatic re-start)
No External Timing Capacitor - Reduces the Numbers of External Components Required