| Electronics > Projects, Designs, and Technical Stuff |
| How to step up 4.95V to 5V? |
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| Zero999:
As mentioned above, if the 50mV drop is an issue the circuit is poorly designed. If it's not your design, then there's little you can do, other than use a precision supply. Another option in addition to onboard regulation, is remote sensing, which uses (an) extra feedback wire(s) to compensate for the voltage drop along the cable. |
| David Hess:
Usually the problem is surge current requirements which cause the voltage to momentarily dip. In any event, a boost switching regulator in one form or another will solve the problem if the input voltage cannot be more tightly controlled. |
| IDEngineer:
I find it interesting that the OP hasn't responded to any of the questions, comments, or suggestions offered on this thread. We don't know anything about the application. All we know is that he's complaining about a supply rail that is actually tighter (1%) than the specs for many linear regulators (!). As someone else noted, maybe what he really needs is an onboard precision reference and his rails don't actually matter that much. Or maybe his circuit is misdesigned. Or maybe he doesn't actually understand what's going on. Maybe he believes when someone specifies "5VDC" there's no margin. The voltage drops when he connects the load - but is it due to the load itself? Or the current drawn by the load, which then drops all of 50mV in his EIGHT FEET of wire? The list of unknowns goes on.... |
| Siwastaja:
The load, whatever it is, is either a) completely broken by design beyond unusable b) poorly documented, or, c) you don't understand the documentation properly. All circuits with such sensitivity to exact input voltage always use local regulation on-board, and are specified with meaningful margin (e.g., they would specify 7V as the minimum input voltage, not 5V, and you would be stepping up from 4.95V to 7V in this case.) There is no other way around this than to fix the load. |
| ArthurDent:
Lots of great practical solutions to the possible problem presented here. The OP hasn’t been back to clarify any of the many questions others have asked for 3 days so it couldn’t have been a very important problem, or they found they made some mistake and the problem wasn’t what they thought it was so they just stopped looking at this thread. |
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