LM621

更新时间： 2024-11-20 23:16:47

品牌	Logo	应用领域
美国国家半导体 - NSC		电机
页数	文件大小	规格书
12页	226K
描述
LM621 Brushless Motor Commutator

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LM621 数据手册

August 1992

LM621 Brushless Motor Commutator

Outputs drive bipolar power devices (up to 35 mA base

current) or MOSFET power devices

General Description

The LM621 is a bipolar IC designed for commutation of

brushless DC motors. The part is compatible with both

three- and four-phase motors. It can directly drive the power

switching devices used to drive the motor. The LM621 pro-

vides an adjustable dead-time circuit to eliminate ‘‘shoot-

through’’ current spiking in the power switching circuitry.

Operation is from a 5V supply, but output swings of up to

40V are accommodated. The part is packaged in an 18-pin,

dual-in-line package.

Compatible with three- and four-phase motors . . .

Ð Bipolar drive to delta- or Y-wound motors

Ð Unipolar drive to center-tapped Y-wound motors

Ð Supports 30- and 60-degree shaft position sensor

placements for three-phase motors

Ð Supports 90-degree sensor placement for four-phase

motors

Directly interfaces to pulse-width modulator output(s)

via OUTPUT INHIBIT (PWM magnitude) and DIREC-

TION (PWM sign) inputs

Features

Direct interface to Hall sensors

Adjustable dead-time feature eliminates current spiking

Outputs are current limited

On-chip clock oscillator for dead-time feature

Undervoltage lockout

Connection Diagram

TL/H/8679–1

Order Number LM621N

See NS Package Number N18A

1995 National Semiconductor Corporation

TL/H/8679

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6 7...12

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