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Article: Negative-to-negative switch-mode converter offers high current and high efficiency.
- Article from:
- EDN
- Article date:
- November 12, 2009
CopyrightCOPYRIGHT 2009 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Budge Ing, Maxim Integrated Products Inc, Sunnyvale, CA
Edited by Martin Rowe and Fran Granville
When converting a negative-output power supply to one with less-negative output, you must ensure that variations in input voltage don't affect the output voltage. All such supplies include an internal reference voltage that enables output-voltage regulation. You usually refer this reference to the most negative rail, which is ground. Thus, the output voltage of such a converter depends on the accuracy of its negative input supply voltage. The circuit in Figure 1 lacks that limitation. Delivering output currents as high as 4A with efficiencies better than 90%, ...