Hi Suraj,
The inductor must be connected to the buck in order for it to operate correctly. I would recommend disconnecting all external loads from the VCC buck output and checking the following component blocks:
1.) Inductor connections between PHand VCC
2.) Capacitor directly after inductor connected to VCC and GND
3.) Diode connected between PH and GND
4.) Voltage divider correctly configured between VCC, VSENSE, and GND.
A good reference for component selection and placement is available with our DRV8301 Boosterpack:
www.ti.com/.../BOOSTXL-DRV8301
The inductor must be connected to the buck in order for it to operate correctly. I would recommend disconnecting all external loads from the VCC buck output and checking the following component blocks:
1.) Inductor connections between PHand VCC
2.) Capacitor directly after inductor connected to VCC and GND
3.) Diode connected between PH and GND
4.) Voltage divider correctly configured between VCC, VSENSE, and GND.
A good reference for component selection and placement is available with our DRV8301 Boosterpack:
www.ti.com/.../BOOSTXL-DRV8301