Snubber Circuits Suppress Voltage Transient Spikes in Multiple Output DC-DC Flyback Converter Power Supplies

Focus:

As a result of leakage inductance in the flyback transformer, flyback converters produce transient voltage spikes on the drain of the power MOSFET and at the secondary rectifier. Passive dissipative voltage snubbers can suppress these spikes, reducing stress on the power MOSFET and rectifier for improved reliability while also enhancing converter efficiency. This application note describes the uses and design of four types of passive dissipative voltage snubbers---the RCD voltage snubber, the RCD clamp, the rate-of-rise control RCD snubber, and the simple RC snubber.

What you’ll learn:

• How to suppress large voltage spikes (transients) in flyback converters using passive dissipative voltage snubbers
• How to design passive dissipative voltage snubbers for flyback converters
• How to understand the causes of transient voltage spikes in flyback converters

Notes:

Maxim Integrated Products Application Note 848

View the Source

Author & Publication:

no author specified, Maxim Integrated Products, Vendor website, Nov 12 2001

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