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AH5775

SINGLE PHASE MOTOR DRIVER



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AH5775 pdf
AH5775
SINGLE PHASE MOTOR DRIVER WITH
INTERNAL HALL EFFECT LATCH SENSOR
Description
The AH5775 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 AH5775 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 overvoltage, the device shuts down the output drive and
enters standby mode to help prevent overvoltage stress on the coil.
Over-temperature shutdown provides thermal protection for the
device.
1. VDD
2. O1
3. O2
4. GND
1 234
TO94
The AH5775 is available in TO94 package.
Features
Supports single-phase full wave BLDC fan/motor drive
Built-in Hall effect sensor and input amplifier
Operating voltage: 2.5V to 18V
Soft switching for low noise DC fan motor applications
Rotor Lock Protection (Lock detection, output shutdown and
automatic restart)
Overvoltage 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 / 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.
AH5775
Document number: DS38232 Rev. 1 - 2
1 of 12
www.diodes.com
December 2015
© Diodes Incorporated



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AH5775 pdf
AH5775
Typical Applications Circuit (Notes 4)
SYSTEM
POWER
Optional
D1
Dz
VDD
C1
AH5775
O1
Motor
Coil
O2
GND
GND
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 and place capacitor as close to the VDD pin as possible. 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
Lock Detect,
Shutdown and
Automatic Re-Start
2 O1
Control
Logic
Block
Soft
Switching
Control
Full Bridge
Driver
3 O2
AH5775
Document number: DS38232 Rev. 1 - 2
2 of 12
www.diodes.com
December 2015
© Diodes Incorporated



Part Number AH5775
Description SINGLE PHASE MOTOR DRIVER
Maker Diodes - Diodes
Total Page 12 Pages
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