Tool/software:
Hi there,
When connecting a large capacitive load, approximately 2mF, the TPS259830 fails to turn on properly. During this time, the measured inrush current is much lower than the set current limit of 14A. Despite adjustments to configurations such as retry attempts, retry intervals, and output voltage slew rate, the device still fails to start up. Could you provide any recommendations for troubleshooting and resolving this issue?
Hi Arush,
Thank you for your response. Currently, it appears that the issue has been resolved. The cause of the startup anomaly should be attributed to the over-temperature protection of the efuse. In my application, the input is 24V. Before the modification, the 24V power supply would start up very quickly, establishing itself before the efuse could activate. This meant that during the efuse activation process, it was subjected to a significant voltage drop, making it prone to overheating and triggering its thermal protection. The proposed solution was to slow down the startup time of the 24V supply, aligning its rise time with the efuse activation process. The actual test waveforms of the efuse current and input voltage are as follows:
