Diodes AH284 Manuel d'utilisateur télécharger pdf

AH284

HALL-EFFECT SMART FAN MOTOR CONTROLLER

AH284

Document number: DS31051 Rev. 11 - 2

1 of 10

www.diodes.com

June 2010

Description

The AH284 is a single-chip solution for driving two-coil

brushless direct current (BLDC) fans and motors. The device

includes a Hall-effect sensor, dynamic offset correction and

two complementary open-drain output drivers with internal

Zener diode protection.

To help protect the motor coils, the AH284 provides Rotor

Lock Protection which shuts down output drives if rotor lock is

detected. The device automatically re-starts when the rotor

lock is removed.

The AH284 is available in SIP4 and SOT89-5L packages.

Features

• Single-chip solution

• Operating Voltage: 3.8V to 20V

• Built-in Hall sensor and input amplifier

• Rotor Lock Protection (Lock detection, output shutdown

and automatic re-start)

• Built-in Zener protection for output driver

• Average output current up to 500mA

• Packages: SIP-4L and SOT89-5L

• Green Molding Compound

Pin Assignments

284

12 43

1 : Vdd

2 : DO

3 : DOB

4 : GND

SIP-4L

(Top View)

3 7

DOBDO

GND

Vdd

SOT89-5L

284

(Top View)

Applications

• Two-coil BLDC cooling fans

• Low to medium voltage, low power BLDC motors

Typical Application Circuit (Note 1)

DOB

GND

12V

L2 L1

284

R1 R2

C1 C2

Notes: 1. Typically it is recommended to us a 56 Ohm resistor for R1 and R2 and a 2.2μF E-Cap capacitor for C1, C2 and C3. These values

may need to be optimized depending on the coils used.

To help with IC protection it’s advised to add a Zener diode between Vdd and ground. The Zener diode should be chosen to help

prevent the supply voltage exceeding the maximum rating of the device.

1 2 3 4 5 6 7 8 9 10

Résumé du contenu

Page 1 - (Top View)

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Page 2 - Functional Block Diagram

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Page 4 - Magnetic Characteristics (T

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Page 5 - ( SIP-4L )

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Page 6 - Power Dissipation Curve

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Page 7 - 52 and 53 week

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Page 8 - Sensor Location

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Page 9

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Page 10 - June 2010

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