- Dec 7, 2010
There is no ripple on the output, that is the point of the output capacitor.
There is no crime in New York, that is the point of the police force
....wouldn't it be great if life and logic worked that way? It sure would be simple.....
Unfortunately, it's not. If we employed your logic, every switching regular used on this forum has zero ripple (because I promise you that they're all using output capacitors)
An output capacitor on a switching regulator doesn't remove the switching ripple, it smooths it, but not completely. There are some *decent* formulas you can employ to estimate the residual output ripple (we talk about some of them in the CCBost thread), but they're absolutely no substitute for proper scoping of the output. The residual output ripple can be substantial, and it can easily be enough to start killing people's diodes. IMO, you shouldn't be selling new drivers until you've had them properly scoped.
Frankly, nobody cares about the scoping of an intermediate stage in your driver (except perhaps to the extent that a bad result early on could be indicative of overall dirty output). A scope on the driver's final output, when the driver is connected to an appropriate test load with characteristics of the LD you'd actually be driving, is what you absolutely positively need to show, IMO.
I STRONGLY suggest not selling these drivers until more comprehensive output scoping has been conducted