AH477 Просмотр технического описания (PDF) - Anachip Corporation
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AH477 Datasheet PDF : 9 Pages
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Single Phase Hall Effect Latch
Features
- On-chip Hall sensor
- Bi-direction H type output drivers for single coil
- Internal bandgap regulator allows temperature
compensated operations and a wide operating
voltage range
- High output sourcing/sinking capability up to
350mA
- Operating voltage: 3.5V~20V
- Low output switching current noise
- Auto-shutdown and auto-restart provided (AH480)
- SIP-4L package for AH477; SIP-5L, MSOP-8L
packages for AH480
Applications
- Single-coil Brush-less DC Fan
- Single-coil Brush-less DC Motor
Pin Configuration
Front View
AH477
Front View
AH480
1234
SIP-4L
12 34 5
SIP-5L
1
8
2
7
3 AH480 6
4
5
MSOP-8L
AH477/480
General Description
AH477/480 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 error 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 bandgap regulator is used to
provide temperature compensated bias for internal
circuits and allows a wide operating supply voltage
range. On top of that, AH480 provides auto
shutdown and auto restart function for the DC fan to
consume less power in the lock up condition.
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.
AH477/480 is rated for operation over-temperature
range from -20 oC to 85 oC and voltage range from
3.5V to 20V. The devices are available in low cost
die forms or rugged SIP-4/5L and MSOP-8L.
Pin Descriptions
(1) SIP-4L(AH477)
Name P/I/O Pin #
Vcc
P
1
DO
O
2
DOB
O
3
Vss
P
4
(2) SIP-5L(AH480)
Name P/I/O Pin #
CT
I/O
1
Vcc
P
2
DO
O
3
DOB
O
4
Vss
P
5
(3) MSOP-8L(AH480)
Name P/I/O Pin #
Vss
P 1, 2
CT
I/O
3
FG
O
4
Vcc
P 5, 6
DO
O
7
DOB
O
8
Description
Positive Power Supply
Output Pin
Output Pin
Ground
Description
Timing Capacitor
Positive Power Supply
Output Pin
Output Pin
Ground
Description
Ground
Timing Capacitor
Frequency Generator
Positive Power Supply
Output Pin
Output Pin
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.0.1 Aug 9, 2004
1/9
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