Phantom Power - 5V to 48V using TPS40210

dlh

Other Parts Discussed in Thread: TPS40210

I am trying to design a phantom power circuit. I have used "Webench" to find a several options for a 5V to 48V @ 150mA design, such as:

http://webench.ti.com/webench5/power/webench5.cgi?origin=ti_panel&lang_chosen=en_US&VinMin=4.5&VinMax=5.5&O1V=48&O1I=0.15&op_TA=30

When I simulate this circuit, there is a fair amount of ripple. So I was hoping I could get some information on either potentially more appropriate designs for above requirements, or how the ripple can be removed.

Any assistance is appreciated.

over 8 years ago

0 JohnTucker over 8 years ago

TI__Guru**** 191445 points

Your link just goes to a selection page in webench. Which IC are you considering?

0 dlh over 8 years ago in reply to JohnTucker

Prodigy 50 points

I am looking at the third design in the list which uses the TPS40210.

0 JohnTucker over 8 years ago in reply to dlh

TI__Guru**** 191445 points

I edited your post title to contain "TPS40210". That way the proper person can find your post to support your question.

0 JohnTucker over 8 years ago in reply to JohnTucker

TI__Guru**** 191445 points

I ran your webench sim. The Vout ripple was 109 mV p-p. Webemch picked a small value, high ESR capacitor. Also for thows caps, the ESL is rather large. I changed the 10 uF electrolytic to 3 x 4.7 uF ceramic tys. Ripple is reduced to 32 mV p-p. You could possibly reduce that further by increasing the output capacitance even more.

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Phantom Power - 5V to 48V using TPS40210