TPS549D22: TPS549D22替代TPS548D22，只修改FSEL阻值，PIN 32脚的R2，R3换位0欧盟，其余外围不变，输出会收到影响吗

1.The TPS549D22 defaults to 650kHz switching frequency with the 1xR ramp generator and only allows this to be adjusted via PMBus.
如果是1/2R，需要通过PMBUS吗？还是默认650Khz?
如果原来PCB没有预留PMB_DATA ,PMB_CLK，是不是不能替代？
2.TPS548D22 designs which selected lower switching frequencies than 650kHz may suffer from increased switching losses and thermal stress.

In designs which were previously tested with a lower switching frequency, power dissipation in the snubber resistor (Series R-C to from SW to GND) should be double checked at the new, higher switching frequency.
是不是SW的频率低于设定值是正常现象？

Hi

    1.  是的，默认频率650kHz.

         没有预留，无法输入。

    2.  频率可以设置，并非一定要650kHz.