Diodes AH5795 Bedienungsanleitung PDF herunterladen

AH5795

SINGLE PHASE HALL EFFECT LATCH SMART

FAN MOTOR CONTROLLER

AH5795

Document number: DS35277 Rev. 1 - 2

1 of 13

www.diodes.com

August 2011

NEW PRODUCT

Description

The AH5795 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.

Motor speed can be controlled by either changing the duty

ratio of the PWM signal at the PWM pin or by varying the

supply voltage at Vdd pin.

To help protect the motor coil, the AH5795 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 AH5795 is available in space saving and low profile

TSOT23-6 and 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

• Speed control methods

o Vdd voltage speed control (PWM pin tied to Vdd)

o PWM signal speed control via PWM pin

• Soft switching for low noise DC fan motor applications

• Rotor Lock Protection (Lock detection, output shutdown

and automatic re-start)

• Toff clear when PWM is low for greater than 65ms

• Thermal protection

• Tachometer (FG) output

• No external timing capacitor - Reduces the numbers of

external components required

• Low profile package: TSOT23-6 and DFN2020C-6

• “Green” Molding Compound (No Br, Sb) (Note 1)

Pin Assignments

(Top View)

Vss

PWM

TSOT23-6

Vdd

PWM

Vdd

Vss

(Top View)

DFN2020C-6

Applications

• 3.3V / 5V BLDC Cooling Fans

• Netbook/ Notebook BLDC fans

• Instruments cooling fans

• Low Voltage/ Low Power BLDC Motors

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

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Inhaltsverzeichnis

Seite 1 - TSOT23-6

AH5795SINGLE PHASE HALL EFFECT LATCH SMARTFAN MOTOR CONTROLLER AH5795 Document number: DS35277 Rev. 1 - 2 1 of 13 www.diodes.com August 2011 © Di

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Seite 3 - (Note 3)

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Seite 4

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Seite 5 - (DFN2020C-6)

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Seite 6 - L H H L

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Seite 7 - PWM speed control

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Seite 8 - 200µs typ

AH5795SINGLE PHASE HALL EFFECT LATCH SMARTFAN MOTOR CONTROLLER AH5795 Document number: DS35277 Rev. 1 - 2 4 of 13 www.diodes.com August 2011 © Di

Seite 9 - Power Dissipation Curve

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Seite 10 - ( Top View )

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Seite 11 - AH5795

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Seite 12

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Seite 13

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