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04/16/06 10:30
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#114328 - ON/OFF(active low) pin?
Responding to: ???'s previous message
Kai Klaas said:
Roughly spoken: The LM2675 step-down switcher contains an ultra low loss switch (very low ohmic when "on"), which is either "on" or "off" and which is opened and closed about 200,000 times a second.
Kai


Having gone through the datasheet of LM2675, iam some what clear with using it for step down purpose.

But need to know about the ON/OFF(active low) pin.

I could see an osillator in the block diagram with a frequency of 260kHz for switching thus forming a switching regulator.
So, if the above is true then, what is the use of this pin.
How to connect it (or) how is it driven? can i know about this.

Thanking you,
Suresh.




List of 21 messages in thread
TopicAuthorDate
step up voltage regulator            01/01/70 00:00      
   12V rectified output?            01/01/70 00:00      
      additional Transformer occupies space            01/01/70 00:00      
         18V Center Tap Transformer?            01/01/70 00:00      
         size ?            01/01/70 00:00      
         Mistake in analysis            01/01/70 00:00      
            why two?            01/01/70 00:00      
               Of course!            01/01/70 00:00      
                  easier            01/01/70 00:00      
            You are righ Kai. I didnt analyse this w            01/01/70 00:00      
               nope, that is why it is called a switche            01/01/70 00:00      
               Step-up, step-down            01/01/70 00:00      
                  ON/OFF(active low) pin?            01/01/70 00:00      
                     Shutdown pin            01/01/70 00:00      
                        Thanks.            01/01/70 00:00      
   Try this simple circuit. It might work            01/01/70 00:00      
   LM2577            01/01/70 00:00      
   expensive is relative            01/01/70 00:00      
   Charge pump            01/01/70 00:00      
      Thank you all            01/01/70 00:00      
         Two are needed!            01/01/70 00:00      

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