Chapter 93

Optimizing a DC/DC converter’s output capacitors

Ajmal Godil and Craig Varga

Abstract

The use of the LTC1435A step-down DC/DC controller to optimize a DC/DC converter’s output capacitors is described.

Keywords

DC/DC converter

Step-down controller

LTC1435A

All DC/DC power supplies comprise closed-loop systems. In any closed-loop system, control theory dictates the need for adequate gain and phase margin for overall system stability. Trade-offs have to be made between phase and gain margin and transient response by adjusting the feedback gain for a given power stage.

Some power IC controller manufacturers have designed their products with internal loop compensation. Hence, the user is forced to select power stage components ...

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