Diodes AH284 Uživatelský manuál stáhnout 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

Shrnutí obsahu

Strany 1 - (Top View)

AH284HALL-EFFECT SMART FAN MOTOR CONTROLLER AH284 Document number: DS31051 Rev. 11 - 2 1 of 10 www.diodes.com June 2010 © Diodes Incorporated Desc

Strany 2 - Functional Block Diagram

AH284HALL-EFFECT SMART FAN MOTOR CONTROLLER AH284 Document number: DS31051 Rev. 11 - 2 10 of 10 www.diodes.com June 2010 © Diodes Incorporated IMP

AH284HALL-EFFECT SMART FAN MOTOR CONTROLLER AH284 Document number: DS31051 Rev. 11 - 2 2 of 10 www.diodes.com June 2010 © Diodes Incorporated Pin

Strany 4 - Magnetic Characteristics (T

AH284HALL-EFFECT SMART FAN MOTOR CONTROLLER AH284 Document number: DS31051 Rev. 11 - 2 3 of 10 www.diodes.com June 2010 © Diodes Incorporated Abso

Strany 5 - ( SIP-4L )

AH284HALL-EFFECT SMART FAN MOTOR CONTROLLER AH284 Document number: DS31051 Rev. 11 - 2 4 of 10 www.diodes.com June 2010 © Diodes Incorporated Elec

Strany 6 - Power Dissipation Curve

AH284HALL-EFFECT SMART FAN MOTOR CONTROLLER AH284 Document number: DS31051 Rev. 11 - 2 5 of 10 www.diodes.com June 2010 © Diodes Incorporated Oper

Strany 7 - 52 and 53 week

AH284HALL-EFFECT SMART FAN MOTOR CONTROLLER AH284 Document number: DS31051 Rev. 11 - 2 6 of 10 www.diodes.com June 2010 © Diodes Incorporated Perf

Strany 8 - Sensor Location

AH284HALL-EFFECT SMART FAN MOTOR CONTROLLER AH284 Document number: DS31051 Rev. 11 - 2 7 of 10 www.diodes.com June 2010 © Diodes Incorporated Orde

Strany 9

AH284HALL-EFFECT SMART FAN MOTOR CONTROLLER AH284 Document number: DS31051 Rev. 11 - 2 8 of 10 www.diodes.com June 2010 © Diodes Incorporated Pack

Strany 10 - June 2010

AH284HALL-EFFECT SMART FAN MOTOR CONTROLLER AH284 Document number: DS31051 Rev. 11 - 2 9 of 10 www.diodes.com June 2010 © Diodes Incorporated Pack

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