TPS59641: Question for TPS59641 VCC in INTEL VRD12-IMVP7 test

Hi Kevin,

Several possibilities may cause this...

From schematic perspective

1. Please check if remote sense connect to the load by 0hom resistor only.

2. Please check if USR is triggered or not, if not, please change USR setting to the lowest threshold.

3. Please check if DCR sense matches L/DCR < RC.

4. Please check if OCP point, if OCL limit controller to provide energy to save undershoot while transient, if yes, please set higher OCP point.

5. Please check if phase margin is enough or not, then fine tune compensator.

6. Please check if inductance can be lower(360nH) or not, 560nH might be too large in this application.

From layout perspective

1. Please check if layout copper is enough from inductor to output load

2. Please check if all the MLCC value/qty. are placed by intel's recommendation

Thanks

Chasel