Don't Let Jitter Shake Up Your Flyback Converter Designs

Focus:

Resonant ringing on the transformer primary can be the cause of harmless variation in the flyback converter's duty cycle. However, if this side affect is not properly identified early in the design process, it may be misinterpreted as instability and lead to unnecessary and performance-degrading redesigns. The article explains operation of the discontinuous-mode flyback converter with peak current-mode control, describes how the transformer's resonant ringing leads to jitter, and offers simple tests that designers can use to tell whether resonant ringing is the source of jitter in their designs.

What you’ll learn:

• How to determine if variation in a flyback converter's duty cycle (jitter) is the result of resonant ringing on the transformer primary
• How to understand operation of discontinuous-mode flyback converters with peak current-mode control

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Author & Publication:

John Bottrill, Senior Applications Engineer, Texas Instruments, Dallas, How2Power Today, Jul 24 2009

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