LM2642 troubleshooting: Signal integrity.

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Reply to "LM2642 troubleshooting: Signal integrity."

linse
on 10/13/2008 at 10:48 AM

Category(s):	power.national.com
Subject:	LM2642 troubleshooting: Signal integrity.
Message:
My proto of an LM2642 app had two faults: Turnon was stuttering, and slower than planned, both are reported by others. Solution: Powerfet gate C is 1000pF or more, and the '2642 sources 0.5A gate drive, meaning 10V rise in 20nS. I used a 10uF ceramic cap at the power pin, with good local grounding. Fixed.

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LM2642 troubleshooting: Signal integrity. (linse)
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