AH281
Hall-Effect Smart Fan Motor Controller
Features
- On chip Hall sensor
- Rotor-locked shutdown
- Automatically restart
- Built-in Zener protection for output driver
- Operating voltage: 10V~20 V, driver start up: 8V
(minimum)
- Output current:
I
O( AVE )
= 300 mA
- Package: SIP-4L, SOT89-5L
General Description
AH281 is a monolithic fan motor controller with Hall
sensor’s capability. It contains two complementary
open-collector drivers for motor’s coil driving,
automatic lock shutdown and restart function
relatively.
To avoid coil burning, rotor-lock shutdown detection
circuit shut down the output driver if the rotor is
blocked and then the automatic recovery circuit will
try to restart the motor. This function repeats while
rotor is blocked. Until the blocking is removed, the
motor recovers running normally.
Pin Assignment
281
Front View
1 : VCC
2 : DO
3 : DOB
1 2
3
4
4 : GND
Pin Descriptions
Name
VCC
DO
DOB
GND
NC
Description
Input power
Output pin
Output pin
Ground
Not connected
SIP-4L
VCC 1
GND 2
DO 3
SOT89-5L
AH281
5 NC
7 DOB
4
Ordering Information
AH281 X - X X X
Wafer Body
Blank or
A~Z : if necessary
to specify
Package
P: SIP-4L
Y: SOT89-5L
Lead
L : Lead Free
Blank: Normal
Packing
Blank : Tube or Bulk
A : Tape & Reel
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. 0.7 Apr 16, 2004
1/7
AH281
Hall-Effect Smart Fan Motor Controller
Absolute Maximum Ratings
Characteristics
Output Zener-breakdown Voltage
Operating Supply Voltage
Output Current
Power Dissipation
Operating Temperature
Storage Temperature
Maximum Junction Temp.
P
D
Topr
Tstg
Tj
(Ta = 25°C)
Symbol
Vz
V
CC
I
O(AVE)
I
O(PEAK)
SIP4
SOT89-5
Rating
38
28
300
400
550
800
-20 ~ 100
-55 ~ 150
150
Unit
V
V
mA
mW
°C
°C
°C
Electrical Characteristics
(
Ta = 25
°C,
V
CC
=12V, unless otherwise specified)
Characteristics
Supply Voltage
Supply current
Locked Protection On
Locked Protection Off
Output saturation voltage
Output On resistance
Symbol
Vcc
I
cc
Tlrp-on
Tlrp-off
V
OUT( sat )
Conditions
Operating
Operating
Min.
10
-
Typ.
2.0
0.4
2.4
375
625
2.6
Max.
20
4.0
Unit
V
mA
Sec
Sec
mV
ohm
I
O
=150mA
I
O
=250mA
-
-
Rds(on)
Magnetic Characteristics
(
Ta = 25
°C,
V
CC
= 12V, unless otherwise specified)
(1mT=10 Gauss)
Characteristics
Operate Point
Release Point
Hysteresis
Symbol
Bop
Brp
Bhy
Min.
--
-60
--
Typ.
30
-30
60
Max.
60
--
--
Unit
Gauss
Gauss
Gauss
Anachip Corp.
www.anachip.com.tw
3/7
Rev 0.7 Apr 16, 2004
AH281
Hall-Effect Smart Fan Motor Controller
Operating Characteristics
DOB
Output Voltage in Volts
Output Voltage in Volts
RP
12
10
8
6
4
ON
2
OP
Vsat
Brp
0
Bop
OFF
OFF
DO
12
10
8
6
4
RP
Vsat
Brp
0
Bop
2
ON
OP
Magnetic Flux Density in Gauss
Magnetic Flux Density in Gauss
Performance Characteristics (SIP4)
Ta (°C)
25
50
60
70
80
85
90
95
100
220
105
198
110
176
115
154
120
132
Pd (mW) 550 440 396 352 308 286 264 242
P d (m W )
600
500
400
300
200
100
0
25
50
75
P o w e r D is s ip a tio n C u rve
100
125
150
T a (。 C )
Anachip Corp.
www.anachip.com.tw
4/7
Rev 0.7 Apr 16, 2004
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