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LM621 - 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 provides an adjustable dead-time circuit to eliminate ‘‘shootthrough’’ current s

Key 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.

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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 provides an adjustable dead-time circuit to eliminate ‘‘shootthrough’’ 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 Compati