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10923 Views 7 Replies Latest reply: Feb 26, 2014 8:15 AM by davecuthbert RSS
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Jan 30, 2014 4:34 PM

Best way to reduce high DC voltage (50-100V) to 5V?

I have a project I'm working on, that amongst other things monitors a battery pack (voltage can be between 50-100V). What is the best way to get 5V from this high voltage to power the monitoring circuit? Obviously a regular voltage regulator (7805 etc) will not work as the input voltage is too high. The circuit's total current draw will be around 150-200mA. Even with this current draw, that's a LOT of heat to dissipate with the big voltage drop.

 

I have found a few components, e.g. 5283 & TL783 that can handle the input voltages, but I have very limited space so not much room for heatsinks. Any ideas?

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