Other Parts Discussed in Thread: TINA-TI,
Hi I've simulated in TINA-TI and built a PCB using the TPS54226 following the datasheet as well as TPS54226EVM-539 example module.
I believe the the regulator is frequently putting itself in over/under voltage protection mode since it shuts down ~1.7 times the soft-start time. This behavior is also reflected in TINA-TI, which I'm able to correct for by tweaking the load resistance and capacitance. However, in practice, this means that my design is very "finicky" in that slight deviations in the load hanging off the LC circuit cause the entire board not to power-up due to the regulator shutting down. See pics below.
What can I be doing better in my design to more reliably use the TPS54226?
Simulated WITH shutdown:
Tweaked circuit WITHOUT shutdown (Rout increased to 10k ohm):
Also worth noting:
Regulator is being used to power an ATSAMD21 microcontroller. Voltage-in is from either 5V USB, benchtop supply, or 2s2p lipo, and voltage-out is set to 3V3 as specified in the datasheet.
Thank you!
