Hi,
I have a system whose minimum voltage will be 5.7V or so. I am okay with the output voltage sagging lower to 4.5V. I realize from my previous question that t_off(min) limits the maximum duty cycle. I calculate that the max duty cycle is at worst 82%, so 5.7V results in 4.7V output.
My question: is it safe and reliable to operate the TPS562202 in this range where input voltage drops below set output voltage? I tested on an oscilloscope and didn't see any irregularities. My tentative conclusion from the datasheet is that the chip simply keeps the duty cycle at the max allowable and the resulting voltage is what it is, but I would like confirmation that this mode of operation is supported.
Regards,
Charlie