| ??? 04/06/06 08:05 Read: times |
#113704 - Compensating buck switcher |
The response to the LDO thread has prompted me to post a query about buck switchers. I've built a 6V in to 2V out switcher using a TPS62102 1MHz buck switcher with synchronous rectification. I pretty much have to use a 4.7uF ceramic cap as the output reservoir cap, and this has a very low ESR (not quoted on datasheet). I've tried a number of different compensation schemes, as suggest on the TI datasheet, and I can get it to oscillate at 100kHz, 200kHz, 34 kHz, 4kHz and randomly!
Some time ago I came across an app note which suggested an unconventional arrangement for the feedback on a buck switcher which works with cap ESR down to zero, but I can't find it now! Has anyone here seen this app note? |
| Topic | Author | Date |
| Compensating buck switcher | 01/01/70 00:00 | |
| layout | 01/01/70 00:00 | |
| Not helpful | 01/01/70 00:00 | |
| Separating? | 01/01/70 00:00 | |
| Clear thinking | 01/01/70 00:00 | |
| I see no savings | 01/01/70 00:00 | |
| No options really | 01/01/70 00:00 | |
| Is this it? | 01/01/70 00:00 | |
Thanks for reading my post | 01/01/70 00:00 |