Output voltage undershoot in flyback based power supply

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Libin

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Hi Friends,
I made one flyback converter and observed voltage undershoot(negative spike) at 12Vdc output rail (12VDC voltage is dropping to 7V for small duration of 2 to 3 nanosecond) frequency of undershoot is same as switching frequency.
Give me some tips for eliminating voltage undershoot in flyback based power supply.

Best regards
Libin
 

Libin, could you show us the circuit?
A capacitor employed as a high frequency filter may be a solution, but it is hard to tell without seeing.
 
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    Libin

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Could it be a measurement problem ? Such as noise pickup by the scope probe ?
 
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    Libin

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Dear Vilela,

Thanks for your response, please refer the attached schematic.
regards
Libin
 

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