Hi Experts,
We observed the negative inductor current for TPS56628 during eco-mode, can you help to check that is this the expected behavior? Test waveform is as below:
Test conditions:
1. TPS56628 EVM.
2. VIN=12V, Vout=0.95V, R_feedback_top=15K, R_feedback_bottom=56K.
3. Load current=0.5A.
Thanks.
Adding more details for this issue - customer is using two open-drain circuits to adjust the TPS56628 bottom feedback resistor, schematic is as below:
Now, this negative inductor current will be observed associated with this voltage control, but we do not know how it is occurred? Kindly help to analysis it.
Attached in below is the current waveform under no load condition:
Thanks.
Hi Jacky,
I did the bench test as your words.
TPS56628 EVM. VIN=12V, Vout=0.95V, R_feedback_top=15K, R_feedback_bottom=56K. Load current=0.5A.Pls see the waveform shown as follows.
Your waveform is abnormal. Pls double check.
Gavin
