The AH5773 is a high performance 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 circuit design 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. For system flexibility, the motor speed can be controlled by changing the duty ratio of the PWM signal at the PWM pin or adjusting the supply voltage.
To help protect the motor coil, the AH5773 provides Rotor Lock Protection which shuts down the output drive if rotor lock is detected. The device automatically restarts 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 device enters standby mode when PWM pin is pulled low for longer than 65ms. In standby mode, AH5773 consumes less than 100uA.
A Tachometer output is provided by open-drain Frequency Generator (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic change frequency.
The AH5773 is available in space saving and low profile MSO8-EP packages.
5V / 9V/ 12V / 15V Min. BLDC Cooling Fans and Motors
Netbook/ Notebook and Desktop BLDC Fans
Instruments Cooling Fans
Medium Voltage/ Low Power BLDC Motors
Supports Single-phase Full Wave BLDC Fan/Motor Drive
Wide Operating Voltage Range: 2.4V to 18V
Built-in High Sensitivity Hall Effect Sensor
Built-in H-Bridge with Low RDSON Resistance
PWM Input for Speed Control
Standby Feature with IDD <100μA
Soft Switching for Low Noise DC Fan Motor Applications
Rotor Lock Protection with Automatic Restart
Toff Clear when PWM is Low for Greater than 65ms
Over Voltage Shutdown
Tachometer (FG) Output
Small Low Profile Package: MSOP8-EP with Exposed Pads for Power Handling Capability