benjal
Newbie level 6
Hello,
I'm working on flyback converter LTC3805 and i have situation when sometimes (one in ten cases) i get overcurrent protection triggerd and "hiccup" mode statring. there is no short-circuit, when i replace controller the circuit works fine.
When i look on the primary current at the Oscilloscope i see every TSS time (200ms) sequence of climb current until reach OC protection. but my question is, if someone could explain me:
1. why the current climibg each pulse (if you could send me to equation)
2. how the contoller take part at the begining of the start-up? because if output voltage not build yet it doesnt have loop.
link to the current primary (green) picture:
link to the circuit picture:
thank you very much for your help.
I'm working on flyback converter LTC3805 and i have situation when sometimes (one in ten cases) i get overcurrent protection triggerd and "hiccup" mode statring. there is no short-circuit, when i replace controller the circuit works fine.
When i look on the primary current at the Oscilloscope i see every TSS time (200ms) sequence of climb current until reach OC protection. but my question is, if someone could explain me:
1. why the current climibg each pulse (if you could send me to equation)
2. how the contoller take part at the begining of the start-up? because if output voltage not build yet it doesnt have loop.
link to the current primary (green) picture:
link to the circuit picture:
thank you very much for your help.