AH5773-MP-13

AH5773 SINGLE PHASE MOTOR DRIVER WITH INTERNAL HALL EFFECT LATCH SENSOR Description Pin Assignments NEW PRODUCT 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. (Top View) 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. FG 1 8 NC PWM 2 7 NC O2 3 6 VDD 5 O1 Pad GND 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 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 device enters standby mode when PWM pin is pulled low for longer than 65ms. In standby mode, AH5773 consumes less than 100µA. 4 MSOP-8EP (Top View) 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. PWM 1 6 FG VDD 2 5 O1 O2 3 4 GND U-DFN2020-6 The AH5773 is available in space saving small low profile UDFN2020-6 and MSOP-8EP packages. Features Applications • • • • • • • • • • • • • • • • • • • 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 Pad 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 PWM Input for Speed Control Standby Feature with IDD