ANH011

ANH011
Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
Contents
1.
Features
2.
General Description
3.
Block Diagram
4.
Pin Configuration
5.
Absolute Maximum Ratings
6.
Typical Performance Characteristics
7.
Application Information
8.
Demo Board Schematic
This application note contains new product information. Diodes, Inc. reserves the right 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.
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ANH011
Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
1.0 Features
- On Chip Hall Sensor
- Rotor-Locked Shutdown
- Automatically Restart
- Frequency Generator (FG) Output
- Built-in Zener Protection for Output Driver
- Internal Diode only Protect for IC Power Reverse Connecting
- Operating Voltage: 3.5V~20 V
- Output Current: Io ( AVE ) = 500 mA
- Package: SIP-5L
2.0 General Description
AH285 is a monolithic fan motor controller with Hall sensor’s capability. The capabilities contain two
complementary open-collector transistors for motor’s coil driving, automatic lock current shutdown, and
recovery protections. Besides, the Frequency Generator (FG) output is for speed detection relatively. To
avoid coil burning, the rotor-lock shutdown detection circuit shuts down the output driver if the rotor is
blocked and then the automatic recovery circuit will try to restart the motor. These protected actions are
repeated and periodic during the blocked period. Until the blocking is removed, the motor recovers running
normally.
3.0 Block Diagram
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ANH011
Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
4.0 Pin Configuration
Symbol
FG
VCC
DO
DOB
GND
5.0
Absolute Maximum Ratings
Description
Frequency Generation
Input Power
Output Pin
Output Pin
Ground
( TA = 25ºC )
Characteristics
Supply Voltage
Output Current
IO (AVE)
Symbol
Rating
Unit
VCC
24
V
SIP5/SOT89-5
SOT23-5
500
400
700
550
230
800
IO (PEAK)
Power Dissipation
SIP5
SOT23-5
SOT89-5
PD
mA
mW
Operating Temperature
TOPR
-40 ~ 100
ºC
Storage Temperature
TSTG
-55 ~150
ºC
TJ
150
ºC
Maximum Junction Temperature
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ANH011
Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
6.0 Typical Performance Characteristics (refer to the diagram in
“Application Information” (P.11))
6.0.1 Min Start-up: Vcc = 3.5V, Icc = 0.04A
a. CH1 = V (DO), CH2 = V (DOB), CH3 = FG, CH4 = I (DO), RPM = 765
b. CH1 = V (DO), CH2 = V (DOB), CH3 = FG, CH4 = I (DOB), RPM = 823
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Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
6.0.2 Min Start-up for DC Fan Locked:Vcc = 3.5V, CT (ON)/(OFF) = 1:5.933
a. CH1 = V (DO), CH2 = V (DOB), CH4 = I (DO), CT (ON) = 600ms
b. CH1 = V (DO), CH2 = V (DOB), CH4 = I (DOB), CT (OFF) = 3.56s
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ANH011
Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
6.0.3 Operation: Vcc =12V, Icc = 0.17A
a. CH1 = V (DO), CH2 = V (DOB), CH3 = FG, CH4 = I (DO), RPM = 2890
b. CH1 = V (DO), CH2 = V (DOB), CH3 = FG, CH4 = I (DOB), RPM = 2920
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ANH011
Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
6.0.4 Operation for DC Fan Locked: Vcc = 12V, CT (ON)/(OFF) = 1:6.17
a. CH1 = V (DO), CH2 = V (DOB) , CH4 = I (DO), CT (ON) = 460ms
b. CH1 = V (DO), CH2 = V (DOB), CH4 = I (DO), CT (OFF) = 2.84s
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Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
6.0.5 Max Working: Vcc = 20V, Icc = 0.28A
a. CH1 = V (DO), CH2 = V (DOB), CH3 = FG, CH4 = I (DO), RPM = 3990
b. CH1 = V (DO), CH2 = V (DOB), CH3 = FG, CH4 = I (DOB), RPM = 4005
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Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
6.0.6 Max. Working for DC Fan Lock: Vcc = 20V, CT (ON)/(OFF) = 1:6.08
a. CH1 = V (DO), CH2 = V (DOB), CH4 = I (DO), CT (ON) = 460ms
b. CH1 = V (DO), CH2 = V (DOB), CH4 = I (DOB), CT (OFF) = 2.80s
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Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
7.0 Application Information:
D1
1
2
1N4001
AH285
COM
U1
Vcc
FG
Gnd
1
1
2
1
3
C BD
COON
R1 G
F VDDG
10K
1
C1
1
C2
2.2uF/50V
2.2uF/25V
1 2 3 4 5
L1
2
L2
2
2
2
C3
1
3
15nF/25V
2
*FG pull high resistor: R1
8.0 Demo Board schematic:
D1
1
2
1N4001
AH285
COM
D2
Vcc
FG
Gnd
1
2
3
1
U1
2
1
1N4001
1
C1
1
R1
10K
B D
C
GCOON
F V D DG
1
C2
2.2uF/50V
2.2uF/25V
1 2 3 4 5
L1
2
L2
2
2
1
2
C3
3
15nF/25V
2
1
R2
56Ω
1
2
2
EC11
2.2uF/50V
1
2
2
R3
56Ω
EC2
2.2uF/50V
10/13
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ANH011
Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
Parts List (Board of Materials):
L_3 PIN
100HZ
Item
L1 mH/Z (Ω)
16.44mH/74.05Ω
Part Number
L2 mH/Z (Ω)
LT = L1 + L2
16.42mH /73.76Ω
65.62mH/152.78Ω
Description
Value
Quantity
C1
Std
SMD/0805
2.2uF/25v
1
C2
Std
SMD/0805
2.2uF/50v
1
C3
Std
SMD/0805
15nF/25v
Option
EC1
Std
Option
Option
Option
EC2
Std
Option
Option
Option
R1
Std
SMD/0805
10kΩ
1
R2
Std
SMD/0805
Option
Option
R3
Std
SMD/0805
Option
Option
D1
Std
SMD/Diode
50V, 1A
1
D2
Std
SMD/Diode
50V, 0.5A
1
L_3PIN
BOARD-TECH
DIP/L1, L2, com
50V, 2A
1
U1, U2
AH285
Hall Ic/SIP-5
3.5~20V
1
11/13
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ANH011
Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
Typical PC Board Layout, Adjustable Output:
(1) Component Placement Guide
(2) Component Side PC Board Layout
12/13
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ANH011
Application Note
AH285 Demo Board Hall-Effect Smart Fan Motor Controller
13/13
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