A277 Datasheet

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Ampson Technology, Inc.

A277

COMPLEMENTARY OUTPUT HALL EFFECT

LATCHED SINK DRIVER

FEATURES

On-chip Hall sensor with two different sensitivity and hysteresis settings for A277.

Internal bandgap regulator allows temperature compensated operations and a wide

operating voltage range.

High output sinking capability up to 400mA for driving large load.

Lower current change rate reduces the peak output voltages during switching.

Build in protection diode for chip reverse power connecting.

Available in die form or rugged low profile 4 pin SIP packages.

GENERAL DESCRIPTION

A277 are integrated Hall sensors with output drivers designed for electronic commutation

of brushless DC motor applications. The device includes an on-chip Hall voltage generator

for magnetic sensing, a comparator that amplifies the Hall voltage, and a Schmitt trigger to

provide switching hysteresis for noise rejection, and complementary open-collector drivers

for sinking large current loads. An internal bandgap regulator is used to provide

temperature compensated supply voltage for internal circuits and allows a wide operating

supply range.

If a magnetic flux density larger than threshold Bop, DO is turned on(low) and DOB is

turned off (high). The output state is held until a magnetic flux density reversal falls below

Brp causing DO to be turned off and DOB turned on.

A277 are rated for operation over temperature range from -20

C to 85

C and voltage

range from 3.5V to 20V. The devices are available in low cost die forms or rugged 4 pin

SIP packages.

1/6

12/26/2001 REV.1.0

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