An Easy Way To Roll Your Own Programmable Power Supply

by Marc Davis-Marsh, applications engineer, National Semiconductor Corp., Santa Clara, Calif., Donald Schelle, staff field applications engineer, National Semiconductor Corp., Ontario, Canada, Electronic Design, Jan 29 2009

Focus:
For any power supply with external feedback components, the addition of an inexpensive DAC and a resistor makes the power supply programmable. Example uses a dc-dc converter IC. Equations are presented for selecting the appropriate resistor values.

What you’ll learn:

• How to add digital programmability to power supplies with external feedback components.
• How to calculate resistor values when adding digital programmability to dc-dc converters and voltage regulators

Notes:
ED's Ideas For Design

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