AH280
Hall-Effect Smart Fan Driver
Features
-
On chip Hall plate
-
Built-in Zener diode protection for output driver
-
Built-in protection diode for power reverse
connecting
-
Rotor-lock detection
-
Automatically restart after release of motor
locking
-
Adjustable auto restart time
-
Operating voltage: 3.5~20 V
-
Max Output current: I
O(AVE)
= 500mA
-
Packages: SIP-5L, SOP-8L, SOP-8L EP
-
Less external component
General Description
AH280 is the integrated Hall sensor owned two
complementary outputs for motor’s coil driving, auto
locked shutdown and auto restart functions.
Functional block diagram includes that a regulator
with temperature-compensated band-gap, an
on-chip Hall voltage generator, a comparator, a
Schmitt trigger and two current output drivers. The
regulator can provide wide operational voltage
range. The Hall voltage generator is to amplify the
Hall voltage due to Hall effect. A Schmitt trigger is
to provide switching Hysteresis for noise rejection.
To avoid coil burning, rotor-lock detection circuit will
shutdown the output driver if detect rotor-lock status.
A rotation recovery circuit is to restart the motor
after rotor-lock is removed. In addition, the auto
re-start time is flexible by adjusting the capacitance
(C
T
).
Pin Assignments
Front View
( Branded side)
Pin Descriptions
SIP-5L
Symbol P/I/O Pin #
CT
VCC
DO
DOB
GND
I
P
O
O
P
1
2
3
4
5
Description
Timing cap.
Positive power supply
Driver output
Driver inverted output
Ground
1 2 3 4 5
SIP-5L
( Top view )
VCC
DO
DOB
NC
1
2
3
4
8
7
6
5
SOP-8L / SOP-8L EP
CT
NC
NC
GND
SOP-8L/SOP-8L EP
Symbol
VCC
DO
DOB
NC
CT
GND
Pin #
1
2
3
4,6,7
8
5
Description
Positive power supply
Driver output
Driver inverted output
Not connected for SOP8
Timing cap.
Ground
This datasheet contains new product information. Analog 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. 0.7 Apr 16, 2004
1/7
ANACHIP [ ANACHIP CORP ]
