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MFG:NSC D/C:DIP
Part Number: LM621
MFG: NSC
D/C: DIP
Description: The LM621 is a bipolar IC designed for commutation of brushless DC motors. The part is compatible with...
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LM621
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DataSheet
General Description
LM621 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.
LM621 Maximum Ratings
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
LM621 Features
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 DIRECTION
(PWM sign) inputs
Direct interface to Hall sensors
Outputs are current limited
Undervoltage lockout
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 DIRECTION
(PWM sign) inputs
Direct interface to Hall sensors
Outputs are current limited
Undervoltage lockout
LM621
PDF/DataSheet Download
- Datasheet: LM621
- File Size: 230115 KB
- Manufacturer: NSC [National Semiconductor]
- Click here to Download
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