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Diodes Semiconductor Electronic Components Datasheet

AH5773 Datasheet

SINGLE PHASE MOTOR DRIVER

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AH5773 pdf
AH5773
SINGLE PHASE MOTOR DRIVER WITH
INTERNAL HALL EFFECT LATCH SENSOR
Description
The AH5773 is a high performance, 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.
To simplify circuit design 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. For system flexibility,
the motor speed can be controlled by changing the duty ratio of the
PWM signal at the PWM pin or adjusting the supply voltage.
To help protect the motor coil, the AH5773 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 device enters standby mode when PWM pin is pulled low
for longer than 65ms. In standby mode, AH5773 consumes less than
100µA.
A Tachometer output is provided by open-drain Frequency Generator
(FG) Pin which allows external interface to monitor motor rotation or
speed. The FG output is the magnetic change frequency.
The AH5773 is available in space saving small low profile U-
DFN2020-6 and MSOP-8EP packages.
Pin Assignments
FG 1
PWM 2
O2 3
GND 4
(Top View)
Pad
8 NC
7 NC
6 VDD
5 O1
MSOP-8EP
(Top View)
PWM 1
6 FG
VDD 2
O2 3
5 O1
Pad 4 GND
U-DFN2020-6
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
Built-in H-Bridge with Low RDSON Resistance
PWM Input for Speed Control
Standby Feature with IDD <100µA
Soft Switching for Low Noise DC Fan Motor Applications
Rotor Lock Protection with Automatic Re-Start
tOFF Clear When PWM Is Low for Greater Than 65ms
Over Voltage Shutdown
Thermal Protection
Tachometer (FG) Output
Small Low-Profile Package: U-DFN2020-6 and MSOP-8EP with
Exposed Pads for Power Handling Capability
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 and Motors
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.
AH5773
Document number: DS35444 Rev. 2 - 2
1 of 17
www.diodes.com
January 2015
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH5773 Datasheet

SINGLE PHASE MOTOR DRIVER

No Preview Available !

AH5773 pdf
AH5773
Typical Applications Circuit
SYSTEM
POWER
Optional
D1
Dz
PWM signal for
speed control
VDD
C1
PWM
GND
GND
AH5773
10kW
FG FG
O1
Motor
Coil
O2
Notes:
4. C1 is for power stabilization and to strengthen the noise immunity; the recommended value is 2.2µF. The value of capacitor can be optimized depending
on the operating mode, motor voltage and the motor current. For PWM speed control mode, with datasheet current capability, the recommended
capacitor value is 2.2µF, for lower motor current 1µF and higher should be used. If PWM speed control function is not used (PWM pin tied high or not
connected) the capacitor value can be reduced towards 0.1µF. The value of the C1 should be checked in the motor design in its operating conditions if it
is reduced from the recommended value of 2.2µF.
5. The AH5773 has an open-drain tachometer FG output that follows the magnetic change frequency. Typically a pull-up resistor of 10kΩ is recommended
from FG pin to the supply voltage.
Pin Descriptions
Package Type: MSOP-8EP
Pin Number
Pin Name
Description
1 FG Frequency Generator (FG) - The FG output is the same as the magnetic change frequency
2
PWM
PWM signal input pin for speed control
3 O2 Output drive sourcing & sinking pin
4
GND
Ground pin
5 O1 Output drive sourcing & sinking pin
6 VDD Power supply input pin
7 NC No connection (Note 6)
8 NC No connection (Note 6)
Note:
Pad Pad Exposed pad for thermal dissipation. It can be connected to GND or left open circuit.
6. NC is “No Connection” pin and is not connected internally. This pin can be left open or tied to ground.
Package Type: U-DFN2020-6
Pin Number
1
2
3
4
5
6
Pad
Pin Name
PWM
VDD
O2
GND
O1
FG
Pad
Description
PWM signal input pin for speed control
Power supply input pin
Output drive sourcing & sinking pin
Ground pin
Output drive sourcing & sinking pin
Frequency Generator (FG) - The FG output is the same as the magnetic change frequency
Exposed pad for thermal dissipation. It can be connected to GND or left open circuit.
AH5773
Document number: DS35444 Rev. 2 - 2
2 of 17
www.diodes.com
January 2015
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AH5773 Datasheet

SINGLE PHASE MOTOR DRIVER

No Preview Available !

AH5773 pdf
Functional Block Diagram
AH5773
VDD 6
Power
Management
Lock Detect,
Shutdown and
Automatic Re-Start
Frequency
Generator
1 FG
PWM 2
Hall
Sensor
Dynamic
Offset
Concellation
AMP
Control
Logic
Block
Soft
Switching
Control
Full Bridge
Driver
GND 4
Temperature
and Voltage
Compensated
Reference
Over Voltage Standby and
Protection
Quick Start
Thermal
Shutdown
5 O1
3 O2
AH5773
Document number: DS35444 Rev. 2 - 2
3 of 17
www.diodes.com
January 2015
© Diodes Incorporated




Part Number AH5773
Description SINGLE PHASE MOTOR DRIVER
Maker Diodes
Total Page 17 Pages
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