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Initial turn on spike(LEB Time) is Greater than normal. How to minimize it???

Posted by: Ashu on

Hello sir,
I have designed 2.16W flyback converter using TNY284, but in drain current waveform initial turn on spike or leading edge blanking time is higher than normal. I have used superfast reverse recovery diode at output. How can i minimize its duration and current limit of it.... I have attached waveform of drain current.

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Comments

Submitted by PI-Jedidiah on 07/24/2020

Hi Ashu,
There are several factors that affects current leading edge spike such as MOSFET gate and output capacitance, interlayer winding capacitance between primary and secondary, and reverse recovery of shottkey or SRFET used in flyback converter. Since you used a superfast recovery diode, you may try to improve your transformer interwinding capacitance.
Regards,
Jedidiah

Submitted by Ashu on 07/26/2020

Thank you Jedidiah sir