Datasheet > A5936GLNTR-T

A5936GLNTR-T

更新时间： 2022-02-26 11:59:44

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
12页	668K
描述
Three Phase Sensorless Sinusoidal Fan Driver

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A5936GLNTR-T 数据手册

A5936

Three Phase Sensorless Sinusoidal Fan Driver

FUNCTIONAL DESCRIPTION

The A5936 targets fan applications to meet the objectives of low

audible noise, minimal vibration, and high efficiency. Allegro’s

This 9-bit “demand” is applied to a PWM generator block to

create the modulation profile. The modulation profile is applied

proprietary control algorithm results in a sinusoidal current wave- to the three motor outputs, with 120-degree phase relationship, to

shape that adapts to a variety of motor characteristics to dynami-

cally optimize efficiency across a wide range of speeds.

create the sinusoidal current waveform as shown in Figure 1.

A BEMF detection “window” is opened on phase A modulation

profile to measure the rotor position so as to define the modula-

tion timing. The control system maintains the window to a small

level to minimize the disturbance and approximate the ideal

The speed of the fan can be controlled by voltage mode (control

of power supply amplitude) or variable duty cycle PWM input.

Use of the PWM input allows overall system cost savings by

eliminating the requirement of an external variable power supply. sinusoidal current waveform as much as possible.

Operation down to 4 V can be achieved to allow the IC to fit into

Protection features include lock detection with restart, overcur-

legacy systems with voltage mode operation.

rent limit, motor output short circuit, supply undervoltage moni-

The PWM input is measured and converted to a 9-bit number.

tor, and thermal shutdown.

OUTA

OUTB

OUTC

Figure 1: Sinusoidal PWM

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

1 2 345 6 7...12

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