DIODES AH285-YL-B

AH285
HALL-EFFECT SMART FAN MOTOR CONTROLLER
General Description
Features
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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.
On Chip Hall Sensor
Rotor-Locked Shutdown
Automatically Restart
Frequency Generator (FG) Output
Built-in Zener Protection for Output Driver
Operating Voltage: 3.8V~20V
Output Current: IO(AVE) = 500mA for SOT89-5
Lead Free Finish/RoHS Compliant for Lead Free
products (Note 1)
Package: SOT89-5L
•
Rotor-lock shutdown detection circuit turns off the output driver
when the rotor is blocked to avoid coil overheat. Then, the
automatic recovery circuit will restart the motor. These protected
actions are repeated and periodic during the blocked period. Until
the blocking is removed, the motor recovers and runs normally.
Ordering Information
AH285 - X X X
Package
Y : SOT89-5L
Note:
1.
Lead-Free
Packing
L : Lead-Free
-B : Bulk
-7/-13 : Taping
RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Lead-free
Device
Package
Code
Packaging
(Note 2)
AH285-Y
Y
SOT89-5
Tube/Bulk
Quantity
Part
Number
Suffix
NA
NA
7” Tape and Reel
Quantity
Part Number
Suffix
2500/Tape & Reel
-7
Note: 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
AH285 Rev. 2
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© Diodes Incorporated
AH285
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Pin Assignment
Vdd 1
GND 2
5 FG
285
DO 3
74 DOB
SOT89-5L
Pin Descriptions
Symbol
FG
Vdd
DO
DOB
GND
Description
Frequency Generation
Input Power
Output Pin
Output Pin
Ground
Block Diagram
Vdd
2
Lock shutdown
and
Automatic recovery
Regulator
Hall
Plate
AH285 Rev. 2
3
DO
4
DOB
Control Logic
Amp.
5
1
GND
FG
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© Diodes Incorporated
AH285
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Typical Application Circuit
D2
Vdd
(12V)
R pu
285
D1
Coil2
1
2
3
4
Coil1
5
GND
FG
C3
Notes: R1, R2: typical 56 Ω
C1, C2, C3: typical 2.2µ F
The R, C value need to be fine tuned
base on coils design.
R1
R2
C1
C2
12V DC Brush-less Fan with FG output function
Absolute Maximum Ratings
(TA = 25°C)
Characteristics
Symbol
Supply Voltage
Rating
24
500
700
800
-40 ~ 100
-55 ~ 150
150
156
Vdd
IO(AVE)
IO(PEAK)
PD
Output Current
Power Dissipation
Operating Temperature
Storage Temperature
Maximum Junction Temp.
Thermal Resistance
Unit
Topr
Tstg
Tj
θJA
V
mA
mW
°C
°C
°C
°C/W
TA
TJ
Tc
θ JA
θ JC
Note:
θ JA
should be confirmed with what heat sink thermal resistance. If no heat sink contacting,
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θ JA
is almost the same as
θ JC .
JANUARY 2007
© Diodes Incorporated
AH285
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Electrical Characteristics
(TA = 25°C, Vdd =12V, unless otherwise specified)
Symbol
Conditions
Min.
Typ.
Max.
Unit
Supply Voltage
Vdd
3.8
-
20
V
Supply Current
Output Leakage Current
Locked Protection On
Locked Protection Off
Idd
Ioff
Operating
Operating
VOUT=24V
0.4
2.4
35
2
< 0.1
0.5
3
375
625
1.25
0.5
42
4
10
0.6
3.6
500
900
1.67
60
mA
µA
Sec
Sec
Characteristics
Tlrp-on
Tlrp-off
Output Saturation Voltage
Output On Resistance
FG Output Vds
Output Zener-Breakdown Voltage
Truth Table
INH
L
-
IN+
L
H
-
CT
L
L
H
Magnetic Characteristics
VOUT( sat )
Rds(on)
Vol
Vz
OUT1
H
L
off
IO=300mA
IO=500mA
IO=300mA
IO=10mA
OUT2
L
H
off
FG
H
L
-
mV
ohm
V
V
Mode
Rotating
Rotating
Lockup protection activated
(TA = 25°C, Vdd = 12V, unless otherwise specified)
(1mT=10 Gauss)
Characteristics
Symbol
Min.
Typ.
Max.
Unit
Operation Point
Release Point
Hysteresis
Bop
Brp
Bhy
10
-60
-
30
-30
60
60
-10
-
Gauss
Gauss
Gauss
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© Diodes Incorporated
AH285
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Operating Characteristics
DO
12
RP
Output Voltage in Volts
Output Voltage in Volts
DOB
OFF
10
8
6
4
2
ON
OP
Vsat
Brp
0
12
OFF
OP
10
8
6
4
2
RP
ON
Vsat
Bop
Brp
Magnetic Flux Density in Gauss
0
Bop
Magnetic Flux Density in Gauss
S
Marking side
N
( SOT89-5 )
AH285 Rev. 2
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AH285
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Performance Characteristics
P
(SOT89-5L)
TA (°C)
25
50
60
70
75
80
85
90
95
100
PD (mW)
800
640
576
512
480
448
416
384
352
320
TA (°C)
105
110
115
120
125
130
135
140
145
150
PD (mW)
288
256
224
192
160
128
96
64
32
0
D
(m W )
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
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A
(°C )
JANUARY 2007
© Diodes Incorporated
AH285
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Marking Information
(1) SOT89-5L
4
7
5
Y : Year 0-9
M : Month A~L
285 Y M X
1
2
X : Internal code
a~z : Lead Free
3
Package Information
(1) SOT89-5L
Sensor Location
AH285 Rev. 2
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© Diodes Incorporated
AH285
HALL-EFFECT SMART FAN MOTOR CONTROLLER
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages.
LIFE SUPPORT
Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the
President of Diodes Incorporated.
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