Part Number: TPS55340
Tool/software: WEBENCH® Design Tools
Hi,
We degisn a boost converter with TPS55340RTER. We design it with WEBENCH (atteched schematic).
In beginning we gave 15V from power supply it worked fine and we incresed it until 22V. Everything worked good.
But when we tried to give the power from adaptor which is 19V, SW and GND pin went short circuit.
Then we changed Css (Soft Start Capacitor) 22nF to 100nF.
First we tried on power supply and it worked fine again. Then we tried again on adaptor.
We connected boost to adaptor when adaptor did not plugged in, then we plugged in adaptor and it works fine. We tried plugged in and out about 10 times and it worked fine.
But when adaptor plugged in we connected boost to adaptor IC burned out. EN and Vin path burned too.
What do you suggest ?