AH5775

PRELIMINARY - CONFIDENTIAL AH5775 SINGLE PHASE MOTOR DRIVER WITH INTERNAL HALL EFFECT LATCH SENSOR Description 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. Pin Assignments (Front View) 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 overvoltage, the device shuts down the output drive and enters standby mode to help prevent overvoltage stress on the coil. Over-temperature shutdown provides thermal protection for the device. 1. VDD 2. O1 3. O2 4. GND 1 234 TO94 The AH5775 is available in TO94 package. Features Supports single-phase full wave BLDC fan/motor drive Built-in Hall effect sensor and input amplifier Operating voltage: 2.5V to 18V Soft switching for low noise DC fan motor applications Rotor Lock Protection (Lock detection, output shutdown and automatic restart) Overvoltage shutdown Thermal protection No...