If I want to operate the TPS76H4001 using the internal oscillator and a frequency different that 500 kHz, how should the SYNC1 and SYNC2 pins be set?
Table 7-1 in the data sheet indicates that SYNC1 should be floating, while SYNC2 is connected to GND.
Using the Pspice transient model, if I follow this recommendation and set RT to 350k ohm, the switching freq is 50 kHz. If I ground both SYNC1 and SYNC2, the switching frequency is 250 kHz which is close to the data sheet equation.
Maybe the model doesn't handle this condition correctly?