I'm attempting to manufacture 29-31V to 5V @ 0.5A power regulator using the LM43603 synchronous step-down voltage converter. I designed the circuit around the WEBENCH simulation, verified by the design equations, and constructed a PCB board where the power regulator is being used as part of a larger transmitter circuit. The schematic and PCB layout are shown below:
Due to strict size constraints, there wasn't space on the PCB to use the pad, but the ground is connected and there aren't any short-circuits. The resistor connected to RT was left open circuit to set default frequency, but a footprint was added to give the option to change. However, when testing out the manufactured board, I received the following output:
I've checked the connections and I've attempted all obvious solutions. The regulator does not appear to be switching. I would really appreciate any assistance with this matter.
Thanks in advance,
Chris