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UCC21520-Q1如何优化上管MOS的自举电压的稳定

Other Parts Discussed in Thread: UCC21520

UCC21520芯片在应用场景,

1)用在DCDC变换器上,驱动的是上下管两颗SIC-MOS管,

2)UCC21520芯片初级供电是5V,输出及供电是20V,

3)UCC21520输出驱动波形在主回路持续 重负载的情况下,输出上管MOS的驱动波形的电压会慢慢下降。

问题就是:如何优化上管MOS的自举电压的稳定,即上管MOS驱动波形的稳定。