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LTspice SMPS sim wont even start switching the FETs

Flyback

Well-Known Member

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eTech

Active Member
Hello,
Do you know why this LTspice simulation of a synchronous 2 transistor forward converter using LTC3705 and LTC3706 won’t even start switching the fets?

Hi

One thing...Q1 and Q2 don't have way to turn on(?).
each need resistor from base to +V
 

ronsimpson

Well-Known Member
Most Helpful Member
I reduced things to try to get anything going. And it does not start.
Changed top gate drive.
119039
Attached the LTC3705 file that does work.
 

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