| ??? 04/16/06 10:30 Read: times | #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. | 
| Topic | Author | Date | 
| 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 | 



