> Is it power dissipation? Is it actual voltage?

I'm no expert, but I would guess the failure mechanism to be breaking 
due to instantaneous power. So a low duty cycle will not help.

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Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: www.voti.nl/hvu

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