Diodes AH5798 Manuel d'utilisateur télécharger pdf

AH5798

SINGLE PHASE HALL EFFECT LATCH SMART

FAN MOTOR CONTROLLER

AH5798

Document number: DS32001 Rev. 2 - 2

1 of 11

www.diodes.com

June 2010

Description

The AH5798 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.

To help protect the motor coil, the AH5798 provides Rotor

Lock Protection which shuts down 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 AH5798 is available in space saving SOT89-5L and

thinner TSOT25 packages.

Features

• Supports single-coil full-wave DC fan drivers

• Built-in Hall sensor and input amplifier

• Operating Voltage: 1.8V to 5.5V

• 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 packages: SOT89-5L and TSOT25

• “Green” Molding Compound

Pin Assignments

3 7

Vss

Vdd

( Top View )

SOT89-5L

( Top View)

Vss

Vdd

TSOT25

Applications

• 3.3V / 5V Min. BLDC Cooling Fans

• Netbook/ Notebook BLDC fans

• Low Voltage/ Low Power BLDC Motors

1 2 3 4 5 6 ... 10 11

Résumé du contenu

Page 1 - ( Top View)

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Page 3

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Page 4 - 100µs typ

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Page 5 - Parameter

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Page 6 - (TSOT25)

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Page 7 - Power Dissipation Curve

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Page 8 - AH5798-WTG TSOT25 K4

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Page 9

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Page 10 - AH5798

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Page 11 - FAN MOTOR CONTROLLER

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