LM621 Datasheet | National Semiconductor

Description The LM621 is a bipolar IC designed for mutation of brushless DC motors The part is patible 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 acmodated The part is packaged in an 18-pin dual-in-line package Features Adjustable dead-time feature eliminates current spiking On-chip clock oscillator for dead-time feature Outputs drive bipolar power devices (up to 35 m A base current) or MOSFET power devices patible 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 DIRECTION (PWM sign) inputs Direct interface to Hall sensors Outputs are current limited Undervoltage lockout Connection Diagram TL H 8679 - 1 Order Number LM621N See NS Package Number N18A C1995 National Semiconductor Corporation TL H 8679 RRD-B30M115 Printed in U S A Absolute Maximum Ratings (See Notes) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications VCC1 VCC2 Logic Inputs (Note 1) Logic Input Clamp Current Output Voltages Output Currents a 7V a 45V Operating Ambient Temperature Range LM621 Storage Temperature Range Junction Temperature ESD Susceptibility (Note 10) Lead Temperature N pkg (Soldering 4 sec ) b 40 C to a 85 C b 65 C to a 150 C 150 C 2000V 260 C VCC1 a 0 5V b0 5V 20 m A a 45V b 0 5V Internally current limited Electrical Characteristics (See Notes) Parameter DECODER SECTION High Level Input...