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Design Review: A 300W,300KHz Current-Mode Half-Bridge Converter with Multiple Outputs Using Coupled Inductors by Roger Adajr

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Design Review: A 300W,300KHz Current-Mode Half-Bridge Converter with Multiple Outputs Using Coupled Inductors by Roger Adajr

Table of Contents

Introduction

Specifications

Topology; half bridge with current mode control.

Advantages and disadvantages.

Stability of half bridge converter using current

mode control.

Solution of stability problem.

PWM control stage and gate driver circuit.

Power stage and transformer design.

Current mode control and slope compensation.

Coupled inductor design

Feedback loop.

References

This paper gives a practical example of the design of an offline switching power supply. The half-bridge topology is used with current mode control. Until recently this was considered an unstable combination, but a simple compensation circuit is now available and is described in this paper. This power supply has two outputs and uses a coupled inductor. Using a coupled inductor with a current mode controlled buck type topology is especially helpful, as will be explained later.




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