Relay driver speeds switching while handling high current

Relay driver speeds switching while handling high current

The final circuit uses the relay coil as the switching inductor, and it simply passes the resulting current through a resistor sized to provide the 1.21-V reference feedback voltage when the relay coil reaches rated current (see the figure). The LM2674 is a garden-variety, high-volume part that is c...

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Veröffentlicht in:Electronic Design 2010-10, Vol.58 (13), p.49
1. Verfasser: Hendrix, Steven P
Format: Magazinearticle
Sprache:eng
Schlagworte:
Circuit components
Controllers
Design engineering
Electric currents
Engineers
Integrated circuits
Switching
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Zusammenfassung:The final circuit uses the relay coil as the switching inductor, and it simply passes the resulting current through a resistor sized to provide the 1.21-V reference feedback voltage when the relay coil reaches rated current (see the figure). The LM2674 is a garden-variety, high-volume part that is cheap and readily available, but most any downswitcher chip rated for sufficient voltage (a maximum 30-V input in this case) and current (70 mA maximum per coil here) could do the job.
ISSN:0013-4872
1944-9550