3 ms·
But such a board likely would have a buck converter between the USB 5V input and those components and their capacitors. Just use a buck with soft start and that
by bradfa 2y ago
But such a board likely would have a buck converter between the USB 5V input and those components and their capacitors. Just use a buck with soft start and that can effectively hide the bulk capacitance from an inrush perspective, no? Then you only count inrush for what’s in front of the buck, which won’t be nothing but can be easily controlled and designed to meet the inrush spec.
- indrora 2y agoPlenty of designs are going to not use a traditional buck converter and instead use something cheap and easy like the AMS1117-33 to just linear-regulate their way to "it works good enough" for everything under 1A.
- IX-103 2y agoThese days switching regulator have gotten so cheap that I'm surprised someone would use a linear regulator instead. You'd probably spend more handling the extra heat than you'd save on a better regulator.
- kevin_thibedeau 2y agoModern USB requires you obey the 150 mA limit before enumeration. You are supposed to be switching power to the rest of the device that needs to exceed that limit.