What type of voltage regulators to use to get +10V/0.7A, -10v/0.7A, +5v/1A and +3.3V/2A DC outputs from a 24v/5A DC source?

[Eng22]

Hi. I have a 24v/5A DC output. I want to get +10V/0.7A, -10v/0.7A, +5v/1A and +3.3V/2A DC o/p from this. What kind of voltage regulators can I use? Any reference designs for these outputs?

 

[KlausST]

Hi,

Theoretically possible to generate all form one flyback.

But I´d use sing SMPS.

For sure it depends on your needs: cost, volume, size, isolation, EMI noise, voltage riple, voltage accuracy, efficiency....

***

Reference designs:
Every SMPS manufacturer as well as every SMPS IC manufacturer provides additional information like: datasheets, application notes, design notes, reference designs... and so on.



Klaus

 

[danadakk]

Multiple Output Regulators | Allegro MicroSystems

Allegro multiple output buck regulators protect against faults and minimize power loss for energy savings. Tested to meet stringent EMC requirements.

www.allegromicro.com

Multi-Output Controllers and Regulators - STMicroelectronics

ST's complete family of DC-DC regulators and controllers designed to provide advanced power management solutions for notebooks, netbooks, tablet PCs.

www.st.com

https://www.analog.com/en/product-category/multiple-output-buck.html

TDA3681_3683 | Multiple voltage regulator

The TDA3681_3683 is a multiple output voltage regulator with a power switch and an ignition buffer for use in car radio.

www.nxp.com

Regards, Dana.

 

[Eng22]

Hi,

Theoretically possible to generate all form one flyback.

But I´d use sing SMPS.

For sure it depends on your needs: cost, volume, size, isolation, EMI noise, voltage riple, voltage accuracy, efficiency....

***

Reference designs:
Every SMPS manufacturer as well as every SMPS IC manufacturer provides additional information like: datasheets, application notes, design notes, reference designs... and so on.



Klaus

Should I use several voltage regulators for each output or just one voltage regulator IC with multiple outputs? which is more reliable and efficient?

Multiple Output Regulators | Allegro MicroSystems

Allegro multiple output buck regulators protect against faults and minimize power loss for energy savings. Tested to meet stringent EMC requirements.

www.allegromicro.com

Multi-Output Controllers and Regulators - STMicroelectronics

ST's complete family of DC-DC regulators and controllers designed to provide advanced power management solutions for notebooks, netbooks, tablet PCs.

www.st.com

https://www.analog.com/en/product-category/multiple-output-buck.html

TDA3681_3683 | Multiple voltage regulator

The TDA3681_3683 is a multiple output voltage regulator with a power switch and an ignition buffer for use in car radio.

www.nxp.com

Regards, Dana.

Should I use several voltage regulators for each output or just one voltage regulator IC with multiple outputs? which is more reliable and efficient?

 

[KlausST]

Hi,

it depends. .. as already written.

Klaus

 

[danadakk]

Reliability, many considerations, like if one supply fails do you want the
others to run, more components = less reliability (in general), this is a
topic in its own right.

Efficiency, do some basic computations.

DC-DC cascade or parallel?

I need to design a power supply that is powered from a single Li-ion cell (3-4.2V) and provides 3.3V up to 500mA and 5V up to 1A. I have three solutions in mind, one is boost converter to 5V and th...

electronics.stackexchange.com

Efficiency in power conversion circuits - Power Electronic Tips

www.powerelectronictips.com

Regards, Dana.

--- Updated Sep 26, 2022 ---

A basic calculation using mic of swing and linear regulators :

Regards, Dana.

--- Updated Sep 26, 2022 ---

 

[cupoftea]

Use Buck for the positive ones.
Use Cuk or Flyback for the negative ones.
Unless you need isolation in all cases, whereby use flyback for all.

Multi output can suffer regulation problems......say of the regulated winding goes on no load etc etc.
Cross regulation can be poor with multi.

 

[dick_freebird]

In the interest of "just getting it done, cheap" I'd look for a generic "28V" to split 15V + 5V brick (or smaller module) and a 5V to 3.3V POL buck. Presuming no great sequencing issues etc.

 

[cupoftea]

Also, you could go to digikey.com, and type in "DCDC converters" in the search field...then find your wanted power supply.

 

[BradtheRad]

By applying your 24VDC supply across a stack of 2 capacitors, you get split 12V supplies. Designate a new ground between them and call one positive and the other negative. Add a half-bridge to give more current to the upper capacitor so as to compensate for its greater amount of loads.

By putting an inductor where a wire was, it smoothes waveforms which are otherwise spike-y with peaks of several Amperes through the capacitors.