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AH5794

SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER

AH5794

Document number: DS35809 Rev. 1 - 2

1 of 13

www.diodes.com

March 2012

NEW PRODUCT

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.

The AH5794 is available in space saving and low profile

TSOT26 and U-DFN2020C-6 packages.

Features

• Supports single-coil full-wave BLDC fan drivers

• Built-in Hall sensor and input amplifier

• Operating voltage: 1.8V to 6V

• V

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

Pin Assignments

Applications

• 3V/ 3.3V/ 5V BLDC Cooling Fans

• Netbook/ Notebook BLDC fans

• Instruments cooling fans

• Low Voltage/ Low Power BLDC Motors

TSOT26

(Top View)

NCFG

U-DFN2020C-6

(Top View)

1 2 3 4 5 6 ... 12 13

Résumé du contenu

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Page 5 - (U-DFN2020C-6)

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Page 6 - March 2012

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Page 7 - 200µs typ

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Page 8 - NEW PRODUCT

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Page 10 - 7 : Tape & Reel

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