Hello,
My customer is using TPS51225C to generate 3.3V and 5V. However, they found the 3.3V output overshoot which leads to shut-down 2mS after start-up.
Meanwhile, The 5V and 3.3V regulator outputs still work.
Could you suggest any possible reason for further analysis?
Here is schematic of TPS51225C:
This is 3.3V output. As we can see after the 3.3V went stable, there was an overshoot.
B.R
Paul
the caps is on schematic above。
the sw waveform is below：（POWER IN =12V）
the DRVH2 and DRVL2 waveform is below：（POWER IN =12V）（yellow is DRVL2）
the amplification of above waveform：
the waveform of output 3.3V and DRVL2 is below:
thank you for your help.
the caps is on schematic above。
the sw waveform is below：（POWER IN =12V）
the DRVH2 and DRVL2 waveform is below：（POWER IN =12V）（yellow is DRVL2）
the amplification of above waveform：
the waveform of output 3.3V and DRVL2 is below:
thank you for your help.
the caps is on schematic above。
the sw waveform is below：（POWER IN =12V）
the DRVH2 and DRVL2 waveform is below：（POWER IN =12V）（yellow is DRVL2）
the amplification of above waveform：
the waveform of output 3.3V and DRVL2 is below:
thank you for your help.
