AH9485/86
Document number: DS38108 Rev. 1 - 2
1 of 12
www.diodes.com
September 2015
© Diodes Incorporated
AH9485/86
NEW PROD UCT
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.
The AH9485 and AH9486 are packaged in TSOT26F.
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 -40ºC to +105ºC
Flat Pin TSOT26F Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
1
4
3
2
5
6
Pin 1 Mark
FG/RD
GND
OUT1
OUT2
PWM
V
DD
TSOT26F
Applications
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
2 of 12
www.diodes.com
September 2015
© Diodes Incorporated
AH9485/86
NEW PROD UCT
Typical Applications Circuit (Note 4)
6
5
4
OUT2
1
2 3
OUT1
GND
V
DD
PWM
10KW
R2
5V
AH9485/86
V
PWM
FG/RD
1KW
R3
4.7W
2.2mF/5.5V
V
DD
R1
C1
Schottky Diode
0.2V
ZD1
5.5V
D1
R4
39W
FG/RD
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.
Pin Descriptions
Pin Number
Pin Name
Function
1
FG/RD
FG(AH9485) or RD(AH9486)
2
GND
Ground pin
3
OUT1
Output pin 1
4
OUT2
Output pin 2
5
PWM
DC voltage or Pulse width modulation signal speed control pin
6
V
DD
Power supply pin