DC 2 DC converter - Electronic Circuits Projects Diagrams Free

rayven1lk · 12th March 2008, 08:04 AM

hey guys, i am completely new to electronics n to this group

... i hav been accepted to go to some training for electronics...my 1st project is to assemble a DC 2 DC converter which converts 12 to 5V at a current of 1A using an IC... ny help would be appreciated...thanks

erosennin · 12th March 2008, 08:25 AM

LM7805 with a Transistor current bypass... simplest and cheapest... not all that efficient.

rayven1lk · 12th March 2008, 08:36 AM

erosennin...thanks for the reply, but as i said i am a beginner in electronics and i have no idea what a transistor current bypass is...would it be possible for you to explain in more detail?

thanks

erosennin · 12th March 2008, 09:36 AM

This is the datasheet for the Voltage Regulator I specified.
http://www.fairchildsemi.com/ds/LM/LM7805.pdf
Although it is a 5V1A regulator, it's not really wise running it at a full 1A.
A Current Bypass does as the name suggests. It bypasses the current via a transistor or FET - as a result the majority of the current doesn't flow through the regulator and un-unnecessarily heat it up.
Take a look at Figure 14 on Page 24 of the datasheet... This is what I'm talking about.

rayven1lk · 12th March 2008, 10:08 AM

thank you very much for the help...much appreciated

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12th March 2008, 08:04 AM	(permalink)
rayven1lk	DC 2 DC converter hey guys, i am completely new to electronics n to this group ... i hav been accepted to go to some training for electronics...my 1st project is to assemble a DC 2 DC converter which converts 12 to 5V at a current of 1A using an IC... ny help would be appreciated...thanks Last edited by rayven1lk; 12th March 2008 at 10:13 AM.

12th March 2008, 08:25 AM	(permalink)
erosennin	LM7805 with a Transistor current bypass... simplest and cheapest... not all that efficient. __________________ What is a joule per second?

12th March 2008, 08:36 AM	(permalink)
rayven1lk	erosennin...thanks for the reply, but as i said i am a beginner in electronics and i have no idea what a transistor current bypass is...would it be possible for you to explain in more detail? thanks

12th March 2008, 09:36 AM	(permalink)
erosennin	This is the datasheet for the Voltage Regulator I specified. http://www.fairchildsemi.com/ds/LM/LM7805.pdf Although it is a 5V1A regulator, it's not really wise running it at a full 1A. A Current Bypass does as the name suggests. It bypasses the current via a transistor or FET - as a result the majority of the current doesn't flow through the regulator and un-unnecessarily heat it up. Take a look at Figure 14 on Page 24 of the datasheet... This is what I'm talking about. __________________ What is a joule per second?

12th March 2008, 10:08 AM	(permalink)
rayven1lk	thank you very much for the help...much appreciated