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SIMPLE SWITCHER® - Forum
Voltage regulator: 3.3 V from 40 V
I don' t have experience with voltage higher than 12 V. I want to make 3.3 V for MSP430 and three motor drivers DRVxxxx, some diodes and external memory. What component is the best for it? I have found: LMR14206 but why is it better than, for instance, LM317? It is for sure more expensive and I can't buy it in every shop.
Is there a difference in tempreture?
Do you know any better soulution?
I can live with 30 V Vin, 40 V is not bad and 50 V will satisfy me a lot.
The LM317 is a linear regulator. The LMR14206 is a switching regulator which would give you much higher conversion efficiency from 40V input. I would not recommend using a linear regulator with the input and output voltages you mentioned because of the low efficiency and high power loss you will see.
A linear regulator with 40V input and 3.3V output will have only 8.25% conversion efficiency. A switching regulator will be 10x more efficient. The power loss you will have to dissipate as heat in the linear regulator would be (40V-3.3V) x Load current.
How much current do you require from the 3.3V?
Once you know the current requirements, I would suggest using our WEBENCH design tool to select the appropriate regulator.
Please go to http://www.ti.com/switcher
You will see a page that looks like this:
On the right of the SIMPLE SWITCHER page you will see the WEBENCH Designer box. Enter your requirements (Vin min, Vin Max, Vout, Iout, Ambient temperature) and click on start design.
The tool will suggest appropriate parts for your design and will provide you with schematic, list of components, and simulation options.
I hope this helps.
Let us know if you have additional questions.
Thank you very much! Your answer was really helpful It is really very helpful tool. It would be better if it will be accessible without logging.
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