AH5772
SINGLE PHASE MOTOR DRIVER WITH
INTERNAL HALL EFFECT LATCH SENSOR
Description
The AH5772 is a single chip solution for driving single-coil brushless
direct current (BLDC) fans and motors. The integrated full-bridge
driver output stage uses soft switching to minimize audible switching
noise and electromagnetic interference (EMI) providing a low noise
solution.
Pin Assignments
(Front View)
To simplify system circuit and minimize external components, the
device integrates a stable high sensitivity Hall-Effect sensor, voltage
and temperature compensated internal references, amplifiers and the
output H-bridge power switches with low RDSON.
To help protect the motor coil, the AH5772 provides Rotor Lock
Protection which shuts down the output drive if rotor lock is detected.
The device automatically re-starts when the rotor lock is removed. In
case of over voltage, the device shuts down the output drive and
enters standby mode to help prevent over voltage stress on the coil.
Over temperature shutdown provides thermal protection for the
device.
The AH5772 is available in industry standard TO94 package.
1. VDD
2. O1
3. O2
4. GND
1 234
TO94
Features
Supports Single-phase Full Wave BLDC Fan/Motor Drive
Wide Operating Voltage Range: 2.4V to 18V
Built-in High Sensitivity Hall Effect Sensor
Very Low Temperature and Voltage Coefficient of the
Magnetic Operating Switch Points
Built-in H-Bridge with Low RDSON Resistance
Soft Switching for Low Noise DC Fan Motor Applications
Rotor Lock Protection (Lock Detection, Output Shutdown and
Automatic Re-start)
Over Voltage Shutdown
Thermal Protection
No External Timing Capacitor - Reduces the Numbers of
External Components Required
Industry Standard TO94 Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
5V / 9V / 12V / 15V Min. BLDC Cooling Fans
Netbook/ Notebook and Desktop BLDC Fans
Instruments Cooling Fans
Medium 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.
AH5772
Document number: DS35442 Rev. 1 - 2
1 of 12
www.diodes.com
September 2014
© Diodes Incorporated
