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AH5794 Datasheet

SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER

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AH5794 pdf
AH5794
SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER
Description
The AH5794 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.
Low operating voltage down to 1.8V allows motor speed to be
controlled by varying the supply voltage.
To help protect the motor coil, the AH5794 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. Over temperature shutdown provides
thermal protection for the device.
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.
Pin Assignments
(Top View)
FG 1
6 NC
VSS 2
O2 3
TSOT26
5 VDD
4 O1
(Top View)
NC 1
VDD 2
O1 3
6 FG
5 O2
4 VSS
U-DFN2020C-6
The AH5794 is available in space saving and low profile
TSOT26 and U-DFN2020C-6 packages.
www.DataSheet.net/
Features
Supports single-coil full-wave BLDC fan drivers
Built-in Hall sensor and input amplifier
Operating voltage: 1.8V to 6V
VDD voltage speed control
Soft switching for low noise DC fan motor applications
Rotor Lock Protection (Lock detection, output shutdown
and automatic re-start)
Thermal protection
Tachometer (FG) output
No external timing capacitor - Reduces the numbers of
external components required
Low profile package: TSOT26 and U-DFN2020C-6
Halogen and Antimony free “Green” packages.
Lead Free Finish/ RoHS Compliant
Applications
3V/ 3.3V/ 5V BLDC Cooling Fans
Netbook/ Notebook BLDC fans
Instruments cooling fans
Low Voltage/ Low Power BLDC Motors
AH5794
Document number: DS35809 Rev. 1 - 2
1 of 13
www.diodes.com
March 2012
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.co.kr/



Diodes Semiconductor Electronic Components Datasheet

AH5794 Datasheet

SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER

No Preview Available !

AH5794 pdf
AH5794
SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER
Typical Application Circuit
Pin Descriptions
www.DataSheet.net/
Pin Name
Description
VDD Power supply pin
VSS Ground pin
O1 Output driving & sinking pin
O2 Output driving & sinking pin
NC No connection
FG Frequency generator (Note 1)
Notes: 1. The FG output is the same as the magnetic change frequency.
AH5794
Document number: DS35809 Rev. 1 - 2
2 of 13
www.diodes.com
March 2012
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.co.kr/



Diodes Semiconductor Electronic Components Datasheet

AH5794 Datasheet

SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER

No Preview Available !

AH5794 pdf
AH5794
SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER
Functional Block Diagram (Note 2)
www.DataSheet.net/
Notes:
2.The AH5794 has an open-drain tachometer FG output that follows the magnetic change frequency. Typically a pull-up resistor of 10kis
recommended from FG pin to the supply voltage.
AH5794
Document number: DS35809 Rev. 1 - 2
3 of 13
www.diodes.com
March 2012
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.co.kr/




Part Number AH5794
Description SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER
Maker Diodes
Total Page 13 Pages
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