I use two LMZ31707. One is set to 3.3V and the second to 5V.
During the startup the 3.3V Regulator hat to track the 5V Regulator.
I calculated the resistors about the equations in the datasheet, but the circuit is not working correctly.
I left the STEEL pin at the 3.3V open how described in the datasheet. But from my point of view, the 3.3V regulator is not in the tracking mode.
Is there a known issue or make i something wrong?
And the voltages look like this:
Ch1: is the 5V supply
Ch2: is the 3V3 suppy (this voltage should track the 5V supply)
Ch3: Is the voltage at the at the SS/TR pin of U19
BR:
Thomas