Liner Voltage Regulator

[Roberto_83]

Can I use this liner voltage regulator ( https://www.icrfq.com/part/2536040-L7805CV.html ) for my detector? I'm proceeding onward to 3.7V 18650 lithium cells in my project. But I don't know how much voltage it can securely handle with. Could you please help me please?


S'il vous plaît me suggérer votre meilleure idée!

Merci beaucoup

 

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[Professor of Engineering]

Hello Roberto 83,

What is the working voltage for your detector?
What will be the input voltage to the regulator from your supply?
What is the current draw of the detector? Under load (boost, pin point...etc.) and Idle? Design for max. current draw then add a safety factor of at least 2.0 (prevents those nasty transients from causing trouble).

You would do well to keep the voltage input within a few volts of regulation output. If not, all of that energy will be dissipated as heat! I would strongly advise using a heat sink and some cooling (if possible). Otherwise the regulator will run HOT and its life span and operation will be greatly reduced.

The regulator being 5 volts will require at the minimum 6+ volts to maintain proper regulated output voltage. I am not going to get into how regulators operate, but remember the regulator needs between 1.0+ V - 2.0+ volts (depends on regulator) above regulated output voltage to "create the magic" voltage reduction.

If you give me a bit more information, I will guide you in proper regulation design that will provide a "rock solid" 5 volt output using capacitors.

Best Regards,

Doc