AH285
Hall-Effect Smart Fan Motor Controller
Features
- On chip Hall sensor
-
Rotor-locked shutdown
-
Automatically restart
- Frequency generator (FG) output
- Buil t-in Zener protection for output driver
- Operating voltage: 3.8V~20V
- Output current: I
O(AVE)
= 500mA for SIP-5/SOT89-5
- Output current: I
O(AVE)
= 400mA for SOT23-5
- Package: SIP-5L, SOT23-5L, SOT89-5L
General Description
AH285 is a monolithic fan motor controller with Hall
sensor’s capability. It contains two complementary
open-drain transistors as motor coil drivers,
automatic lock current shutdown, and recovery
protections. Additional, frequency generator (FG)
output is for speed detection 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
the rotor is blocked. Until the blocking is removed,
the motor recovers running normally.
Pin Configuration
285
( Front View )
1 : FG
2 : Vdd
3 : DO
4 : DOB
5 : GND
1 2 3 4 5
Pin Descriptions
Symbol
FG
Vdd
DO
DOB
GND
Description
Frequency generation
Input power
Output pin
Output pin
Ground
SIP-5L
Vdd
5
Vdd 1
GND 2
DO 3
SOT89-5L
285
7 DOB
4
5 FG
285
DOB
4
1
FG
2
3
GND DO
SOT23-5
Ordering Information
AH285 X - X X X
Wafer Body
Blank or
A~Z : if necessary
to specify
Package
P: SIP-5L
W: SOT23-5L
Y: SOT89-5L
Lead
L : Lead Free
Packing
Blank : Bulk
A : Tape & Reel
(for SOT Packages Only)
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. 1.0 Sep 29, 2005
1/9
AH285
Hall-Effect Smart Fan Motor Controller
Block Diagram (SIP5)
Vdd
2
Lock shutdown
and
Automatic recovery
Regulator
3
Hall
Plate
DO
Amp.
Control Logic
4
DOB
5
GND
1
FG
Typical Application Circuit (SIP5)
D2
Vdd
(12V)
R
pu
D1
1
2
285
Coil2
3
4
5
Coil1
FG
C3
GND
R1
Notes: R1, R2: typical 56
Ω
C1, C2, C3: typical 2.2
µ
F
The R, C value need to be fine tuned
base on coils design.
R2
C2
C1
12V DC Brush-less Fan with FG output function
Anachip Corp.
www.anachip.com.tw
2/9
Rev 1.0 Sep 29, 2005
AH285
Hall-Effect Smart Fan Motor Controller
Absolute Maximum Ratings
Characteristics
Supply Voltage
Output Current
I
O(AVE)
(Ta = 25°C)
Symbol
Vdd
SIP5/SOT89-5
SOT23-5
I
O(PEAK)
Power Dissipation
Operating Temperature
Storage Temperature
Maximum Junction Temp.
Thermal Resistance
θjc
P
D
Topr
Tstg
Tj
SIP5
SOT23-5
SOT89-5
SIP5
SOT23-5
SOT89-5
Rating
24
500
400
700
550
230
800
-40 ~ 100
-55 ~ 150
150
227
543
156
Unit
V
mA
mW
°C
°C
°C
°C/W
Electrical Characteristics
(
Ta = 25
°C,
Vdd = 12V, unless otherwise notice)
Characteristics
Supply Voltage
Supply current
Output Leakage Current
Locked Protection On
Locked Protection Off
Output saturation voltage
Symbol
Vdd
Idd
Ioff
Tlrp-on
Tlrp-off
Conditions
Operating
Operating
V
OUT
=24V
Min.
3.8
-
-
0.4
2.4
-
-
-
-
35
Typ.
-
2
< 0.1
0.5
3
375
625
1.25
0.5
42
Max.
20
4
10
0.6
3.6
500
900
1.67
-
60
Unit
V
mA
µA
Sec
Sec
V
OUT( sat )
Rds(on)
Vol
Vz
Output On resistance
FG output Vds
Output Zener-breakdown Voltage
I
O
=300mA
I
O
=500mA
I
O
=300mA
I
O
=10mA
mV
ohm
V
V
Magnetic Characteristics
(
Ta = 25
°
C, Vdd = 12V, unless otherwise specified)
(1mT=10 Gauss)
Characteristics
Symbol
Min.
Typ.
Max.
Unit
Operate Point
Release Point
Hysteresis
Bop
Brp
Bhy
10
-60
-
30
-30
60
60
-10
-
Gauss
Gauss
Gauss
Anachip Corp.
www.anachip.com.tw
3/9
Rev 1.0 Sep 29, 2005
AH285
Hall-Effect Smart Fan Motor Controller
Operating Characteristics
DOB
DO
Output Voltage in Volts
RP
OFF
Output Voltage in Volts
12
10
8
6
4
2
OFF
12
10
8
6
4
2
OP
ON
OP
Vsat
RP
ON
Vsat
Brp
0
Bop
Brp
0
Bop
Magnetic Flux Density in Gauss
Magnetic Flux Density in Gauss
S
S
Marking side
S
Marking side
Marking side
N
( SOT23-5 )
N
( SIP5 )
N
( SOT89-5 )
Performance Characteristics (SIP5)
Ta (°C)
Pd (mW)
Ta (°C)
Pd (mW)
P d (m W )
600
500
400
300
200
100
0
0
25
50
75
100
125
150
T a (。 C )
25
550
105
198
50
440
110
176
60
396
115
154
70
352
120
132
80
308
125
110
85
286
130
88
90
264
135
66
95
242
140
44
100
220
150
0
P o w e r D is s ip a tio n C u rve
Anachip Corp.
www.anachip.com.tw
4/9
Rev 1.0 Sep 29, 2005
AH285
Hall-Effect Smart Fan Motor Controller
Performance Characteristics (SOT23-5)
Ta (°C)
25
50
60
70
80
90
100
110
120
130
140
150
Pd (mW)
230
184
166
147
129
110
92
74
55
37
18
0
P d (m W )
P o w e r D is s ip a tio n C u rv e
300
200
100
0
0
25
50
75
100
125
150
T a (。 C )
Performance Characteristics (SOT89-5)
Ta (°C)
25
50
60
70
75
80
85
90
95
100
Pd (mW)
Ta (°C)
800
105
640
110
576
115
512
120
480
125
448
130
416
135
384
140
352
145
320
150
Pd (mW)
P d (m W )
288
256
224
192
160
128
96
64
32
0
P o w e r D is s ip a tio n C u r v e
900
800
700
600
500
400
300
200
100
0
0
25
50
75
100
125
150
T a (
。
C )
Anachip Corp.
www.anachip.com.tw
5/9
Rev 1.0 Sep 29, 2005
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