AH5795 データシートの表示（PDF） - Diodes Incorporated.

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AH5795

SINGLE PHASE HALL EFFECT LATCH SMART FAN MOTOR CONTROLLER

Diodes Incorporated. 

AH5795

SINGLE PHASE HALL EFFECT LATCH SMART

FAN MOTOR CONTROLLER

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.

Pin Assignments

(Top View)

FG 1

Vss 2

O2 3

6 PWM

5 Vdd

4 O1

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.

TSOT23-6

(Top View)

PWM 1

Vdd 2

O1 3

6 FG

5 O2

4 Vss

DFN2020C-6

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)

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.

AH5795

Document number: DS35277 Rev. 1 - 2

1 of 13

www.diodes.com

August 2011

© Diodes Incorporated

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