LMR14030-Q1: Output Voltage Divider Resistor Values not Setting Correct Voltage

Hello,

Can you share your operating conditions including your desired output voltage? It looks like it is 4V based on the schematic but just want to confirm. 

What are the tolerances of the resistors being used for the feedback divider network? 

Do you have any steady state images of Input voltage, SW node voltage, and output voltage to share? 

Regards,

Harrison Overturf 

Hi Harrison.

Input Voltage: 12 V

Output Voltage: 4 V

Switching Frequency: 1 MHz

Resistor Tolerances: 1%

I don't have steady state images at the moment to share. I can acquire those.

Thanks,

Hello Jesse, 

In addition to the oscilloscope images Harrison requested, could you also share your PCB layout implementation?

Thank you, 

Denislav

Layout

Top

Bottom

Can you please also show the component designators for all components (e.g. capacitors and resistors) and any other layers that may be relevant (if you have more layers)?

Hi Jesse,

One additional thing I just thought of. Could you share the wave form/voltage of the "4V FB" pin with the 2 different resistor networks?

Thanks,

Andrew