Power supply 2-12v/1A using PWM - Electronic Circuits Projects Diagrams Free

hydro · 17th December 2003, 08:52 PM

Hi everyone...

Here is my problem.I have designed a few basic power supplies (+/-15 volts for some op amps and a basic power supply using an LM317).

Recently we have been asigned to design a power supply(low power) with an output of 2-12V/1A using PWM modulation.

Am i supposed to controlt the PWM duty cycle using thyristors?Is there a PWM ic?

Plz some help and if anyone one has a link for an actual schmeatic as all i can find is schmeatics for linear power supplies...

Thnx :idea: :lol:

ChrisP · 17th December 2003, 09:06 PM

For one, look at the UCC3580 from TI -- datasheet here...

ChrisP · 17th December 2003, 09:31 PM

Of course, the TL494 is also a commonly-used PWM IC in switchmode power supplies... I probably should have mentioned that one first!

Sebi · 17th December 2003, 10:21 PM

You can use a "Simple Switcher" buck regulator from National Semi or ON Semi.

hydro · 18th December 2003, 03:33 PM

Thnx...Hopefully those ic's will be available in the greek market

hydro · 18th December 2003, 03:37 PM

Do u think i could use an Lm555 with a normal power supply fot the PWM modulation?

csaba911 · 19th December 2003, 05:41 PM

Just find a old AT/ATX powersupply or any switching PS, you will have the TL494 or the C3580.
70% using this IC's.

STEVE

hydro · 19th December 2003, 07:28 PM

Thnx for the info...Ill post my final schematic probably by Monday :wink:

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17th December 2003, 08:52 PM	(permalink)
hydro	Power supply 2-12v/1A using PWM Hi everyone... Here is my problem.I have designed a few basic power supplies (+/-15 volts for some op amps and a basic power supply using an LM317). Recently we have been asigned to design a power supply(low power) with an output of 2-12V/1A using PWM modulation. Am i supposed to controlt the PWM duty cycle using thyristors?Is there a PWM ic? Plz some help and if anyone one has a link for an actual schmeatic as all i can find is schmeatics for linear power supplies... Thnx :idea: :lol:

17th December 2003, 09:06 PM	(permalink)
ChrisP	For one, look at the UCC3580 from TI -- datasheet here...

17th December 2003, 09:31 PM	(permalink)
ChrisP	Of course, the TL494 is also a commonly-used PWM IC in switchmode power supplies... I probably should have mentioned that one first!

17th December 2003, 10:21 PM	(permalink)
Sebi	You can use a "Simple Switcher" buck regulator from National Semi or ON Semi.

18th December 2003, 03:33 PM	(permalink)
hydro	Thnx...Hopefully those ic's will be available in the greek market

18th December 2003, 03:37 PM	(permalink)
hydro	Do u think i could use an Lm555 with a normal power supply fot the PWM modulation?

19th December 2003, 05:41 PM	(permalink)
csaba911	Just find a old AT/ATX powersupply or any switching PS, you will have the TL494 or the C3580. 70% using this IC's. STEVE

19th December 2003, 07:28 PM	(permalink)
hydro	Thnx for the info...Ill post my final schematic probably by Monday :wink: