I have a circuit where I am dynamically powering up the LM48580 to drive a piezo speaker. My design does not drive the /SHDN pin (it is tied to the VDD power). The circuit does not always operate, I see power on the device and my input signal is running, but I don't see anything going on at the SW node.
I simulated my circuit on TINI, but the model does not appear to be complete, since there is no SW node on the model. The models shows that it should be working.
Is there any guidelines for power up timing and what needs to be done on the input signal while the part is powering up?
