AH478 Datasheet | BCD Semiconductor

Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION General Description The AH478 is a single coil Hall sensor with output drivers designed for brush-less DC motor application. This IC consists of one H-bridge driver for motor's coil driving and has automatic lock shutdown and restart function relatively. To avoid coil burning, rotor lock shutdown detection circuit shut down the output driver if the rotor is blocked and then the automatic recovery circuit will try to restart the motor. This function repeats while rotor is blocked. Until the blocking is removed, the motor recovers running normally. If a magnetic flux density is larger than threshold BOP, the DO is turned to sink and DOB is turned to drive. This output state is held until a magnetic flux density reversal falls below BRP, causing DO to be turned to drive and DOB turned to sink. This IC is available in TO-95 package. Features - - - - - - - - - - - On-chip Hall Sensor Rotor-locked Shutdown Automatically Restart Operating Voltage: 3.5 to 18V High Output Sourcing/Sinking Capability up to 300m A Bi-direction H-type Output Drivers for Single Coil Internal Bandgap Regulator for Temperature pensation Low Output Switching Current Noise Operating Temperature: -20 to 85o C Low Profile TO-95 Package ESD Rating: 3000V (Human Body Model) Applications - - Single Coil Brushless DC Motor Single Coil Brushless DC Fan TO-95 Figure 1. Package Type of AH478 Nov. 2008 Rev. 1. 2 1 BCD Semiconductor Manufacturing Limited ..net Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION Pin Configuration Z5 Package (TO-95) 5 4 3 2 1 GND DOB DO VCC CT Figure 2. Pin Configuration of AH478 (Front View) Pin Description Pin Number 1 2 3 4 5 Pin Name CT VCC DO DOB GND Function Lock and rotation setting capacitor terminal Supply voltage Output 1 Output 2 Ground Nov. 2008 Rev. 1. 2 2 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH...