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AH5772

SINGLE PHASE MOTOR DRIVER



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AH5772 pdf
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



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AH5772 pdf
Typical Applications Circuit
AH5772
SYSTEM
POWER
Optional
D1
Dz
VDD
C1
GND
GND
AH5772
O1
Motor
Coil
O2
Note:
4. C1 is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 0.1µF for small motor current to 1µF or higher for
larger motor current. The value of C1 should be selected adequately to support the motor current.
Pin Descriptions
Pin Number
1
2
3
4
Pin Name
VDD
O1
O2
GND
Description
Power supply input pin
Output drive sourcing & sinking pin
Output drive sourcing & sinking pin
Ground pin
Functional Block Diagram
VDD
1
Power
Management
Hall
Sensor
Dynamic
Offset
Concellation
AMP
4
GND
Temperature
and Voltage
Compensated
Reference
Over Voltage
Protection
Lock Detect,
Shutdown and
Automatic Re-Start
2 O1
Control
Logic
Block
Thermal
Shutdown
Soft
Switching
Control
Full Bridge
Driver
3 O2
AH5772
Document number: DS35442 Rev. 1 - 2
2 of 12
www.diodes.com
September 2014
© Diodes Incorporated



Part Number AH5772
Description SINGLE PHASE MOTOR DRIVER
Maker Diodes - Diodes
Total Page 12 Pages
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