Sir,
I am using LM5121 boost controller in one of my application.We have designed the converter to achieve a boost voltage of 65V from 28V, at a switching frequency of 650KHz. The part number of the switching MOSFETS used are
High side & Low side FET - IPB123N10N3 G.
But we are observing voltage spikes at the 65V output and the max spike voltage is going up to 85V. This spike voltage is coming with in a period of 900uSEC.
Is there any chance to occur spikes at the output in diode emulation mode????.... i have grounded the Mode pin to GND.
What will be the reason for the spikes observed at the output??
Kindly clarify.
Regards,
Prajeesh.