Time (s)

Discontinuous Conduction Mode (DCM)

IPeak

Time (s)

Time (s)

Time (s)

Time (s)

Discontinuous Conduction Mode (DCM)

DCM - CCM Boundary

Continuous Conduction Mode (CCM)

Continuous Conduction Mode (CCM)

VIN

IAVERAGE

IAVERAGE

VIN

LM20146

www.ti.com

SNVS563C – FEBRUARY 2008 – REVISED APRIL 2013

Figure 28. Modes of Operation for LM20146

Design Guide

This section walks the designer through the steps necessary to select the external components to build a fully

functional power supply. As with any DC-DC converter numerous trade-offs are possible to optimize the design

for efficiency, size, or performance. These will be taken into account and highlighted throughout this discussion.

To facilitate component selection discussions the circuit shown in Figure 29 below may be used as a reference.

Unless otherwise indicated all formulas assume units of Amps (A) for current, Farads (F) for capacitance,

Henries (H) for inductance and Volts (V) for voltage.

Copyright © 2008–2013, Texas Instruments Incorporated

Submit Documentation Feedback

13

Product Folder Links: LM20146