Other Parts Discussed in Thread: LM5060
In our design, the LM5060 will be driving two N-channel FETs acting as switches for a buck converter with a switching frequency of 30kHz. When testing with resistive loads (without the buck converter), OCP works as intended. However, when tested with the buck converter, OCP doesn't trigger and the LM5060 does not turn off the FETs. Instead, I see the FAULT line and the voltage between the SENSE and OUT pins oscillating at 1.8MHz (attached is a scope shot, FAULT line is CH3 and Vsense-out is CH2). The oscillations only happen after current surpasses the OCP threshold. With a resistive load, these oscillations happen briefly and then the LM5060 turns off as intended.
Schematic included below.
In the final design, we plan to have the OCP trip point set at 50A. So far, these tests have been with a trip point set at 10A and 20A. I would like to understand why I'm seeing these high frequencies and if there is anything that can be done to fix OCP capabilities.
