Hi team,
1. DC-DC input voltage is 9.1V and load is 2.6A, tps54340 can work normally at low temperature-20 C, but with load more than 2.8A, the output voltage will jitter and can not startup properly, and after a few seconds it will be normal.
2. But at normal temperature and + 55 C, the input voltage of DC-DC is about 9.1V, and 3.5A load tps54340 can work normally.
Two 100uF tantalum capacitors are added to the output port, and the problem still existed.
Would you please help analysis the reason and give suggestion to improve this?
Figure 1 shamatic
Figure 2 output voltage
Figure 3 waveform at ripple, green EN, blue: boost, red SW
Figure 4 waveform after ripple stop, yellow output, green EN, blue: boost, red SW
