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LM621

更新时间: 2024-11-04 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

LM621 数据手册

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August 1992  
LM621 Brushless Motor Commutator  
Y
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.  
Y
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  
Y
Directly interfaces to pulse-width modulator output(s)  
via OUTPUT INHIBIT (PWM magnitude) and DIREC-  
TION (PWM sign) inputs  
Features  
Y
Y
Y
Y
Direct interface to Hall sensors  
Adjustable dead-time feature eliminates current spiking  
Outputs are current limited  
Y
On-chip clock oscillator for dead-time feature  
Undervoltage lockout  
Connection Diagram  
TL/H/8679–1  
Order Number LM621N  
See NS Package Number N18A  
C
1995 National Semiconductor Corporation  
TL/H/8679  
RRD-B30M115/Printed in U. S. A.  

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