Overview: MH 477
Single Phase Fan Motor Driver IC
MH477 is the integrated Hall sensor with output drivers designed for electrical commutation of brush-less DC motor application. The devices are included as follows: on-chip Hall voltage generator for magnetic sensing; the amplifier that amplifies the Hall voltage; a comparator is to provide switching hysteresis for noise rejection; the bi-direction drivers for sinking and driving large current load. Internal band gap regulator is used to provide temperature compensated bias for internal circuits and allows a wide operating supply voltage range.
If a magnetic flux density larger than threshold Bop, DO is turned to sink and DOB is turned to drive. The 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.
MH477 is rated for operation over-temperature range from -20 °C to 85 °C, also the thermal shut-down function is included, and voltage range from 3.5V to 20V. The device is packaged by SIP-4.
