Recently, I designed a buck-boost circuit using our LT8390 from Analog Devices. The expected input is 12-54V and the output is 5-27V/30A. The circuit is wired and connected according to the DC2431A-4-SCH reference design, but After the circuit is built, there is no output voltage. When testing the waveforms, it is found that the BG1 pin of the main control chip LT8390 and the BG2 pin of LT8390 have positive pulse waveform output. The voltage of the TG1 pin of the main control chip LT8390 and the TG2 pin of LT8390 is always low, resulting in no output. As a troubleshooting direction, Where should I start so that the TG1 pin of the chip LT8390 and the TG2 pin of the LT8390 have a high level output?
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