AH9485/86
SINGLE PHASE LOW NOISE SMART MOTOR DRIVER
Description
The AH9485 and AH9486 are single chip solutions for driving a single
phase (coil) brushless DC motors.
It integrates the motor driver and
the high sensitivity Hall effect sensor to simplify the system circuit and
PCB design for simpler solutions.
Rotor lock-detect, shutdown and auto-restart functions help to prevent
the motor from over-heating when rotor is locked and restarts the
motor after the lock is removed.
The
AH9485 and AH9486
have built-in open drain tachometer
frequency generator (FG) and rotation detection (RD) outputs to allow
external interface to monitor motor rotation, speed or rotor locks
conditions easily. The FG provides magnetic change frequency while
the RD provides the rotor status.
The full bridge output stage uses “soft-switching” technique to
minimize the audible switching noise (vibration and acoustic noise)
and electromagnetic interference (EMI) providing a low noise solution.
Over-temperature shutdown provides thermal protection for the
device. An external DC voltage or a PWM (pulse-width modulation)
signal on the PWM pin can be used to control the motor speed.
Pin Assignments
(Top View)
Pin 1 Mark
FG/RD
GND
OUT1
1
2
3
6
5
4
V
DD
PWM
OUT2
NEW PRODUCT
TSOT26F
The
AH9485 and AH9486
are packaged in TSOT26F.
Applications
Features
Internal Full Bridge Driver
High Sensitivity Integrated Hall Sensor
Low and Wide Supply Voltage Range of 2V to 6V
Soft Switching for Low Noise
Rotor Lock Protection and Auto-Restart
DC Voltage or PWM Signal Speed Control
Thermal Protection
Tachometer FG Output(AH9485) or Rotor Lock Alarm RD Output
(AH9486)
Operating Temperature Range of -40º to +105º
C
C
Flat Pin TSOT26F Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
5V Low Noise BLDC Cooling Fans
Low Voltage / Low Power BLDC Motors
Notebook / VGA DC Fans / Blowers
Micro-Motors
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AH9485/86
Document number: DS38108 Rev. 1 - 2
1 of 12
www.diodes.com
September 2015
© Diodes Incorporated
AH9485/86
Typical Applications Circuit
(Note
4)
V
PWM
Schottky Diode
0.2V
V
DD
D1
R1
4.7W
ZD1
5.5V
R3
1KW
NEW PRODUCT
C1
2.2mF/5.5V
6
5
PWM
4
AH9485/86
R2
5V
10KW
FG/RD
39W
Note 4:
Must use C1 capacitor for the decoupling between V
DD
and GND and place the capacitor as close to the IC as possible.
ZD1: V
DD
over-voltage stress protection diode.
R2: current limit resistor for Open Drain RD output.
R3: de-coupling resistor for long-distance signal transmission.
1
R4
2
3
Pin Descriptions
Pin Number
1
2
3
4
5
6
Pin Name
FG/RD
GND
OUT1
OUT2
PWM
V
DD
FG(AH9485) or RD(AH9486)
Ground pin
Output pin 1
Output pin 2
DC voltage or Pulse width modulation signal speed control pin
Power supply pin
Function
AH9485/86
Document number: DS38108 Rev. 1 - 2
2 of 12
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FG/RD
OUT1
GND
OUT2
V
DD
September 2015
© Diodes Incorporated
AH9485/86
Absolute Maximum Ratings
(Notes 5 and 6) (@T
A
=+25° unless otherwise specified.)
C,
Symbol
V
DD
I
OUTP
I
OUTC
V
FG/RD
I
FG/RD
Supply Voltage
Peak Output Current
Continuous Output Current
FG/RD Pull-up Voltage
FG/RD Current
Power Dissipation
Thermal Resistance ( Junction to Ambient)
Storage Temperature
ESD (Human Body Model) (Note 7)
Parameter
Rating
7
500
300
7 or V
DD
20
520
141
-55 to +150
2000
Unit
V
mA
mA
V
mA
mW
º
C/W
º
C
V
NEW PRODUCT
P
D
JA
T
STG
ESD
Note:
5. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied.
Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.
6. The absolute maximum V
DD
of 7V is a transient stress rating and is not meant as a functional operating condition. It is not recommended to operate the
device at the absolute maximum rated conditions for any period of time.
7. Electronic semiconductor products are sensitive to Electro Static Discharge (ESD). Always observe Electro Static Discharge control procedures
whenever handling semiconductor products.
Recommended Operating Conditions
Symbol
V
DD
T
A
Supply Voltage
Ambient Temperature
Parameter
Min
2
-40
Max
6
+105
Unit
V
º
C
Electrical Characteristics
Symbol
I
DD
R
DSON1
R
DSON2
V
OL
I
LEAK
t
ON
Locked Rotor Period
t
OFF
PWM
HIGH
PWM Voltage Range
PWM
LOW
(@V
DD
= 5V, T
A
=+25° unless otherwise specified.)
C,
Conditions
–
I
OUT
= 300mA
T
J
= +125º I
OUT
= 300mA
C,
I
OL
= 10mA
V
FG
(V
RD
) = 5V
–
–
–
–
Min
–
–
–
–
–
–
–
>0.5×
DD
V
0
Typ
1.8
2
3
0.33
0.15
0.25
1.5
–
–
Max
3
–
–
0.5
10
–
–
V
DD
<0.14×
DD
V
Unit
mA
Ω
Ω
V
μA
s
s
V
V
Parameter
Supply Current
ON Resistance
(R
PMOS
+R
NMOS
)
OUT1, OUT2 ON Resistance
FG/RD Output Low Voltage
FG/RD Output Leakage Current
AH9485/86
Document number: DS38108 Rev. 1 - 2
4 of 12
www.diodes.com
September 2015
© Diodes Incorporated
AH9485/86
Magnetic Characteristics
(@V
DD
=5V, T
A
=+25° unless otherwise specified.)
C,
Symbol
B
OP
B
RP
B
HYS
Operating Point
Releasing Point
Hysteresis
Parameter
Min
0
-50
–
Typ
25
-25
50
Max
50
0
–
Unit
Gauss
Gauss
Gauss
NEW PRODUCT
Magnetic Hysteresis Characteristics
OUT1 (V)
OUT2 (V)
-25
0
25
Magnetic (Gauss)
0
25
-25
Magnetic (Gauss)
OUT1 Output vs. Magnetism
OUT2 Output vs. Magnetism
Output Waveforms Description
(Notes 8 and 9)
V
DD
Re-Start Time
Shutdown Time
t
ON
t
OFF
OUT1,
OUT2
FG
The voltage level depends on OUT1 pin’s voltage
level before lock-shutdown
RD
Notes:
8. RD and FG are open drain outputs and the high level of the signal depends on the external supply voltage.
9. The on torque time of motor is same as the re-start time.
AH9485/86
Document number: DS38108 Rev. 1 - 2
5 of 12
www.diodes.com
September 2015
© Diodes Incorporated
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