Unable to edit Parameters in PI EXPERT
The following message appears when editing any parameters. Unable to create any new design also.
Problem: The selected voltage is outside the limits that apply to a standard circuit configuration.
For this special requirement and guidance for design, contact Applications Engineering.
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Here is the screen shot you requested
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| 3.3ps.jpg (409.54 KB) | 409.54 KB |
Hi Sudhac,
The reason for this warning is when designing at low voltages, BPS capacitor will have to take its voltage (typical 4.6V) from the internal regulator of the IC. Now, at light load, the switching frequency of InnoSwitch decreases and may not guarantee the charging of the BPS capacitor. Technically you can still do a design of 3.5V but you would need a secondary bias circuit. Unfortunately, it's not yet implemented in the current PI Expert version.
Hi sudhac,
Can you provide me any details on which PI Expert you encounter this with a screenshot of the parameters you were trying to edit?