LM621

VCC1 .........................................................+ 7V
VCC2 .......................................................+45V
Logic Inputs (Note 1) .........VCC1 a0.5V, b0.5V
Logic Input Clamp Current 20 mA
Output Voltages............................ a45V, b0.5V
Output Currents ........Internally current limited
Operating Ambient Temperature Range
LM621 ....................................b40ßC to a85ßC
Storage Temperature Range b65ßC to a150ßC
Junction Temperature 150ßC
ESD Susceptibility (Note 10) ...................2000V
Lead Temperature, N pkg.
(Soldering, 4 sec.) ..................................260ßC


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.