Why does a warning message come up stating “Insufficient Phase Margin” when I am designing a circuit using SMS 6.24?
In Switchers Made Simple 6.24 (SMS6.24), the warning message for “Insufficient Phase Margin” occurs when the phase margin is less than 23 degrees. Most often, designs with low phase margin occur when using the LM259x and LM259xHV series of products. To eliminate the stability problems, use a -ADJ part and set the Cff capacitor to about 2.2nF to 10nF. For high output voltage (>12V), select a cheaper output capacitor with higher ESR. You may not find one in the list of choices, so check “Custom” and enter an ESR > 300mohm.
Related Questions
- I just upgraded to the newest version of Bibble, and every time I start Bibble, I get a warning message stating: "One or more plug-ins are out of date and have not been loaded." Whats wrong?
- I got a warning message dialog from Skype when BayGenie is trying to send a SMS notification to me. Is that right?
- What is Short Message Services (SMS)?
