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LM621N Datasheet

  • LM621N

  • LM621 Brushless Motor Commutator

  • 12頁

  • NSC

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LM621 Brushless Motor Commutator
August 1992
LM621 Brushless Motor Commutator
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 鈥樷€榮hoot-
through鈥欌€?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
Y
Y
Features
Y
Y
Y
Y
Y
Adjustable dead-time feature eliminates current spiking
On-chip clock oscillator for dead-time feature
Outputs drive bipolar power devices (up to 35 mA base
current) or MOSFET power devices
Compatible with three- and four-phase motors
Bipolar drive to delta- or Y-wound motors
Unipolar drive to center-tapped Y-wound motors
Supports 30- and 60-degree shaft position sensor
placements for three-phase motors
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
Direct interface to Hall sensors
Outputs are current limited
Undervoltage lockout
Connection Diagram
TL H 8679 鈥?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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