LM621 Datasheet - National Semiconductor

LM621 LM621 Brushless Motor Commutator

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.

LM621 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 d

LM621_NationalSemiconductor.pdf