Design Guidelines for RCD Snubber of Flyback Converters

Application Note AN-4147 Design Guidelines for RCD Snubber of Flyback Converters

This article presents some design guidelines for the RCD snubber of flyback converters. When the MOSFET turns off, a high-voltage spike occurs on the drain pin because of a resonance between the leakage inductor (Llk) of the main transformer and the output capacitor (COSS) of the MOSFET. The excessive voltage on the drain pin may lead to an avalanche breakdown and eventually damage the MOSFET. ...

Modeling of Cross-regulation in Multiple-output Flyback Converters

In this paper, complex operation of multiple-output flyback converters is explained in terms of the extended cantilever magnetics model. Analytical results are derived that can accurately predict steady-state cross-regulation properties of a converter with any number of outputs and with arbitrarily complex magnetics configuration. Two snubber configurations are considered: a passive voltage-cla...

Analysis and design for RCD clamped snubber used in output rectifier of phase-shift full-bridge ZVS converters

Detailed analysis and parameter design for a resistorcapacitor-diode (RCD) clamped snubber used in the output rectifier of phase-shift full-bridge zero-voltage-switching (PS-FB-ZVS) converters are presented. Design equations and some properties of the clamped circuit are highlighted.

An Improved Design for Zvt Dc-dc Pwm Converters with Snubber Assisted Auxiliary Switch

This paper proposes an improved design to calculate the snubber auxiliary elements of ZVT DC-DC PWM converters with snubber assisted auxiliary switch. The proposed improved design guidelines are based on the reduction of the conduction losses through the auxiliary circuit. It is accomplished by the unique location of the turn-off snubber capacitor, which is shared by both active switches. By me...

Design Guidelines for Flyback Converters Using FSQ-series Fairchild Power Switch (FPSTM)