Low cost solution for 24VAC to 12V/5V

Jeetendra Dayaldasani

Prodigy 30 points

What would be lowest cost solution to derive +12Vdc / 600mA and +5Vdc / 1A from a 20.5-26.5V AC source?

Thanks!

over 11 years ago

0 Ryan May over 11 years ago

TI__Genius 13700 points

Hello Jeetendra,

The easiest way for you to find the lowest cost solution for your design would be to place a full wave rectifier and filtering cap to create DC rail. You then take the resulting DC value, which depends on whether the voltage you gave in your post is the peak or RMS voltage, and use that DC value as the input to WEBENCH Power Architect and then selecting the proper loads at +12 and +5 and tuning the dial to the lowest BOM cost option.

http://www.ti.com/lsds/ti/analog/webench/power-architect.page

Ryan May

0 Jeetendra Dayaldasani over 11 years ago in reply to Ryan May

Prodigy 30 points

Thank you very much Sir!

Webench is pretty cool... although I expected it to show an LDO for the 5V - instead it recommended a swticher.

0 Ryan May over 11 years ago in reply to Jeetendra Dayaldasani

TI__Genius 13700 points

Hello Jeentendra,

One of the options in the power architect is to define a rail as an LDO. Look right below the load voltage an LDO supply can be selected as the desired rail supply.

Ryan May

0 Jeetendra Dayaldasani over 11 years ago in reply to Ryan May

Prodigy 30 points

I had seen that and tried to force an LDO, but the solution still provided a switching regulator...

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Low cost solution for 24VAC to 12V/5V