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AH2985

TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER



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AH2985 pdf
AH2985
TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER
Description
The AH2985 is a single-chip solution for driving two-coil brushless
direct current (BLDC) fans and motors. The device includes a Hall-
effect sensor, dynamic offset correction and two complementary
open-drain output drivers with internal Zener diode protection. It is
optimized for low start-up voltage.
To help protect the motor coils, the AH2985 provides Rotor Lock
Protection which shuts down output drives if rotor lock is detected.
The device automatically re-starts when the rotor lock is removed.
Over temperature shutdown provides thermal protection for the
device.
Pin Assignments
(Top View)
AH2985
The AH2985 is available in TO94 package.
12 3 4
1 : VDD
2 : DO
3 : DOB
4 : GND
Features
Single-Chip Solution
Operating Voltage: 2.5V to 15V
Built-in Hall Sensor and Input Amplifier
Rotor Lock Protection (Lock Detection, Output Shutdown and
Automatic re-Start)
Built-in Reverse Voltage Protection Diode
Built-in Zener Protection for Output Drivers
Average Output Current up to 500mA
Package: TO94
GreenMolding Compound
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
TO94
Applications
Two-Coil BLDC Cooling Fans
Low Voltage/ Low Power BLDC 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.
Typical Applications Circuit (Note 4)
12V
VDD
D2
AH2985
VDD DO DOB GND
1234
GND
D1 C
L1 L2
12V Brushless DC Fan
Note: 4. D1 (Zener Diode) and Capacitor C are for power stabilization. Recommended value of C is 1μF/ 50V (E-Cap). Diode D2 is optional and helps to protect the
device and fan coils from reverse power conditions. The AH2985 also includes an internal reverse blocking diode at VDD pin.
AH2985
Document number: DS38175 Rev. 1 - 2
1 of 8
www.diodes.com
September 2015
© Diodes Incorporated



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AH2985 pdf
Pin Descriptions
Pin Number
1
2
3
4
Pin Name
VDD
DO
DOB
GND
Input Power
Output Pin
Output Pin
Ground
Function
AH2985
Functional Block Diagram
VDD
1
Regulator
Hall
Plate
Amp.
Lock Detect,
Shutdown and
Automatic Re-start
Control Logic
2 DO
3 DOB
4
GND
AH2985
Document number: DS38175 Rev. 1 - 2
2 of 8
www.diodes.com
September 2015
© Diodes Incorporated



Part Number AH2985
Description TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER
Maker Diodes - Diodes
Total Page 8 Pages
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