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TPS55340: COMP外围电路配置会影响到soft-start time吗?

Part Number: TPS55340


本设计使用该芯片实现24 to 30V的BOOST电源,Vin电容配置是4.7uf+100nf各一,Vout与输出相同,SS电容使用默认的47nf(在Demo板上测试soft-start time为4ms左右),然后自己设计了一块PCB,拿到手后按照计算EXCEL表配置了COMP阻容值,这时候就出现了问题, 修改C4为470nf,soft-start time在17ms左右,但是理论上应该是4ms。通过修改C4的值为100nf后,测试结果与Demo板测试结果一致,且将C3电容容值倍增后soft-start time也会倍增。

以上问题能否有大神帮忙解惑,感激不尽。