I need "PWM-Circuit" for controlling a &am

[Vauxdvihl]

Hello everybody !!

I serach for a "PWM-Circuit" for controlling a "Buck/Boost-Converter" !!

Does anybody have a circuit !!

Thank you

*****************************************
Please don't reply unless you have useful information to add on this post.
Any other replies are always welcome via PM.

 

[MITSUKO]

What is a buck/boost converter ?

 

[C-Man]

A Buck converter is a switchmode regulator which generates a lower voltage than it's supply voltage.

A Boost converter works the other way round :smile:

regards

 

[chief451]

And a buck/boost converter generates a lower or higher voltage than the input voltage but
requires two switches :smile:

ByE
chief451

 

[stephenpan]

anybody know how to design PWM regulator...??
or any other info link?

thanx

 

[amberhawk]

have you considered a sepic design?

anyway,check out the LinearTechnology's
LTC1625
No RSENSE™ Current ModeSynchronous Step-DownSwitching Regulator

In linear's DesignNote 233 a buck/boost convertor is explained with this chip.

data sheet:
hxxp://www.linear-tech.com/pdf/1625f.pdf

designNote 233:
**broken link removed**

rgds
amberhawk

 

[Sebi]

Hi,

LM1578A from National Semiconductors can
also work as buck-boost converter.

Sincerely: Zsolt