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i need to design a power supply with 24v input and 5v output

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Medtronic

Medtronic

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uc384224v to 5v

Hi all:
i need to design a power supply with 24v input and 5v output with 5A
please can any one help


Thanks
 

tps5450 24v

Ouch, tough problem!

A linear regulator will have to dissipate (24v - 5v) * 5A = 95Watts!

You are really going to have to use a switcher, unless you live in a cold climate and want to heat the room :D

If you absolutely have to design your own, I would suggest going to National's or Linear's site and use their virtual Cad stuff to select a circuit. The good thing is that 80% of all the new part announcements are for regulators.

Obviously, buying a module is the far easiest thing to do. If you look at Jameco or Mouser (in the USA) they sell surplus stuff pretty cheap. Your requirements (24v-5v) are not that uncommon.

What type of application is this? Hobby, conversion, new design. professional application?
 

Re: Power supply design

for all network engineers....i hope u read it ..layer 2
 

Re: Power supply design

Hi,

Check out the TL2575 from Texas Instruments. Looks like a good fit.
Regards.
 

Re: 24v to 5V at 5A

Switching regulator (higher efficiency):
**broken link removed**
or
Linear regulator (a lot of heat):
**broken link removed**

Regards,
IanP
 

Re: 24v to 5V at 5A

Hello,

I think 5 A is a current level where you could think about switching controllers with external switches. LM2678 is generally a good choose , cause it's really a simple switcher needing minimal external circuitry. But 5 A is also the maximum continous current for this part. Wouldn't be good design practice to set nominal to maximum current.

Regards,
Frank
 

Re: Power supply design

Medtronic said:
Hi all:
i need to design a power supply with 24v input and 5v output with 5A
please can any one help


Thanks
Click to expand...

This is the microcontrollers section, so what kind of power supply do you want? Digitally controlled, controlled by a variable resistor, with current and voltage displays, if what you want is only a simple power supply, you are posting at the wrong forum section.
 

Power supply design

LM2575 will handle only 1A current you can use TPS5450 from taxas will handle 5A
 

Re: Power supply design

I'm posting my diagram here, I use it now for 25years+, on pin 2 of JP1001 you have regulated 5V and on pin3 you have 5V up to your input voltage that can be up to 32V, adjustable with VR1, if you replace the transistor with a 2N3055 with a proper heat sink you can draw up to 15 amp.
 

Power supply design

1002, C1004, C1005 have to be replaced with 50V components.
 

Re: Power supply design

@Medtronic

From "Rules & Points":
cross posts are strongly unwanted. They're an unuseful load of EDAboard forum areas
Click to expand...
How do you regard posting exactly the same question in two EDAboard forums within ten minutes?

Happy developing and bye for now,
Frank
 

Power supply design

Would you like it if a cap blow up in your face? that is what happen, when you connect 32 volt to a 16volt cap. that is why I had to post the mod.
 

    Medtronic

    Medtronic

    Points: 2
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Re: Power supply design

For FvM
Hi frank i'm so sorry but after i ask the question at analog design fourm... i think it will be better to ask at microcontroller designeres

sorry again

MedTronic

Added after 10 minutes:

for chrismicro

your design looks a very good design but ... did you mean i can neglect the second 7805 (U1002) and adjust the pot to get +5v at jp1001 pin 1 and how many amper can i get with bd911 or like

Regards
MedTronic
 

Power supply design

The BD911 max is 3amp an you can leave out the second 7805 you can also connect your first 7805 directly to GND then you will have 5V only but the 2N3055 is easy to get I only used the BD911 for the smaller package.
 

Re: Power supply design

Thanks too much for fast replay

i'll test the circuit with 2n3055

Best Regards

MedTronic
 

24v to 5V at 5A

The best thing for this spec appears to use a switcher like UC3842 and a MOSfet and design an smps. it will help in realizing efficient power supply.

Sarma
 

Re: Power supply design

chrismicro said:
The BD911 max is 3amp an you can leave out the second 7805 you can also connect your first 7805 directly to GND then you will have 5V only but the 2N3055 is easy to get I only used the BD911 for the smaller package.
Click to expand...
After all I checked again the BD911 will do the job.[/img]
 

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