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Tool/software:
Hello, when I am using BQ25703A to charge the battery, the input voltage is 20V/1A and the output current is around 2A/8V (BQ25703A is soldered onto the board I designed). I found that the two MOS transistors in Figure 1 are heating up severely, probably at 55 ℃. However, when testing the EVM using the same method, the temperature of the two MOS transistors is only 40 ℃. I captured the waveforms of the two MOS gates on the EVM board as shown in Figure 2, and the waveforms of the two MOS transistors on the board I designed myself are shown in Figure 3, but I did not see any significant differences; Figure 4 shows the PCB layout of the board I designed myself ，The input wiring width is approximately 3-4mm, Figure 5 and Figure 6 shows the selection parameters of MOS transistors, Figure 7 shows the parameters of inductors, and Figure 8 shows the waveform of SW pins. I hope you can provide some improvement suggestions.I am looking forward to your answer very much， Thank you very much，
HI,
Are you sure the bottom FET gate drive is modified as below? I would suggest following the EVM schematic and repeating the same test?
Regards,
Tiger
HI
After modifying the schematic according to the reference design and conducting the same test again, the temperature of MOS still remains at 55 ℃. Figure 1 is the latest schematic. Thank you very much
