| ??? 05/05/07 16:19 Modified: 05/05/07 16:51 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#138672 - Only the ESR minimum of cap is what counts Responding to: ???'s previous message |
Also, you can simply check the stability of regulator: Connect a resistor of about 250R briefly across Vcc and GND at output of regulator and look for ringing on Vcc. Vary your output decoupling cap and look what happens.
You can also simulate instant input voltage changes by the help of a suited series resistor (10R, for instance) connected in series to the input. Short it briefly and look for any ringing on Vcc at output of regulator. Remember, if the regulator is unstable, then you definitely will see ringing! The more unstable, the more ringing. Finally, even continuous oscillation, when over-egging the pudding... Kai |
| Topic | Author | Date |
| Ceramic instead of Tantalum? ESR? | 01/01/70 00:00 | |
| a nice paper related to the topic | 01/01/70 00:00 | |
| Ceramic it is, but.. | 01/01/70 00:00 | |
| LDO regs and ESR | 01/01/70 00:00 | |
| naah, just know-how | 01/01/70 00:00 | |
| Odd | 01/01/70 00:00 | |
| It\\\'s because of chip design | 01/01/70 00:00 | |
| Good Idea! But... | 01/01/70 00:00 | |
| It's not my original idea | 01/01/70 00:00 | |
| Y5V preferred | 01/01/70 00:00 | |
| Still out of stable region at low frequency | 01/01/70 00:00 | |
Only the ESR minimum of cap is what counts | 01/01/70 00:00 |