A277
| Model | A277 |
| Description | COMPLEMENTARY OUTPUT HALL EFFECT LATCHED SINK DRIVER |
| PDF file | Total 6 pages (File size: 167K) |
| Chip Manufacturer | ETC |
Ampson Technology, Inc.
A277
COMPLEMENTARY OUTPUT HALL EFFECT
LATCHED SINK DRIVER
FEATURES
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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
o
C to 85
o
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
