Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
For low currents an analog regulator will work as well as the resistive divider described above. For high currents a switcher is the most efficient.
If your question is about modifying an existing supply internally, you need to generate or look at the schematic. There will usually be a switching supply controller IC. The data sheet for the part will describe how to select the external component values for the 3.3 V you need and for stability under load current transients.
Hi
There are standard linear regulators like LM3840. You may have to choose between linear or switching regultors. Be aware of u'r final application.
BRMadhukar
Hi,
If u r using purely analog/sensitive circuits, the frequency of switching becomes critical as it may pick up, in sch cases you have to use a linear regulator. The disadvantage is power consumed will be higher. For digital circuits you can use a switching regulator.
I've built a step down converter for using AMD K6-2 processor
in an old fashioned HP Vectra PC some years ago. I was built it from scratch,
the regulator was an SG3526 with some external parts and a power MOS FET as a switch.
One thing to take care: for higher currents the voltage drop can be high on the drain-source resistance (Rds on)
and its not going to work. (Yes, it was not obvious for me )
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
)
