Design Contest Flash Innovation 2003

Programmable DC Power Supply

Motorola Flash Innovation 2003 – Design Contest
First Prize

Mihai Tudosie


Instead of the classic transformer—with a regulator, lots of wires, and a 5-V power supply—this power supply is more like a real tool. The power supply is based on the 68HC908QT4, and features 0.6- to 20-V output voltage with 8-mV resolution, and 0- to 2.5-A output current with 10-mA resolution. Other features include short-circuit protection, adjustable current limit (5-ms response time), 5-mVPP maximum output ripple, and a 2 × 16 LCD. The power supply can drive the LCD using only three I/O lines, two of which are shared with other peripherals. The resolution of the internal ADC can be increased from 8 to 14 bits. Integer arithmetic is used to save computational power and ROM.

Supporting Files

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Contest Ended: June 30, 2003

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Programmable DC Power Supply

by Circuit Cellar Staff time to read: 1 min