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Switching Power Supplies A - Z, 2nd Edition by Sanjaya Maniktala

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Chapter 19

Solved Examples

This goes into several solved examples, culminating in a very detailed design of a Buck converter, including selection of components, estimation of losses and efficiency, thermal management, and feedback loop design.

Example 1

We have a non-synchronous Buck converter operating in continuous conduction mode (CCM). Its input is 12 V and output is 5 V. It uses a BJT switch with a forward drop VCE (sat)≡VSW=0.2 V. The catch diode is a Schottky device with forward drop VD=0.4 V. The load current is 1.5 A. What is the duty cycle? What is the dissipation in the BJT and in the diode? What is the estimated efficiency?

We set: VO=5 V, VIN=12 V, VD=0.4 V, VSW=0.2 V, IO=1.5 A.

Dissipation in the BJT and diode, and the total ...

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