AH477A

Data Sheet SINGLE PHASE HALL EFFECT LATCH General Description The AH477A is an integrated Hall sensor with Hbridged output driver designed for brushless DC motor applications. The device includes an on-chip Hall sensor for magnetic sensing, an amplifier that amplifies the Hall voltage, a comparator to provide switching hysteresis for noise rejection, a bi-directional drivers for sinking and driving large current load. It also includes an internal bandgap regulator to provide temperature compensated bias for internal circuits and allows a wide operating supply voltage range. Placing the device in a variable magnetic field, if the 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 the magnetic flux density reverses and falls below BRP, then causes DO to be turned to drive and DOB turned to sink. The AH477A is available in TO-94 (SIP-4L) package. AH477A Features · · · · · · · · · On-Chip Hall Sensor Operating Voltage: 3.5V to 18V H-Bridge Output Drivers for Single Coil Internal Bandgap Regulator for Temperature Compensation Low Output Switching Current Noise Operating Temperature: -20oC to 85oC Low Profile TO-94 (SIP-4L) Package ESD Rating: 6000V (Human Body Model) Suitable for PWM Power Supply Control Speed Applications · · Single-coil Brushless DC Motor Single-coil Brushless DC Fan TO-94 Figure 1. Package Type of AH477A Oct. 2009 Rev. 1. 2 1 BCD Semiconductor Manufacturing Limited www....