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UCD7231 Spice model
The UCD family of parts are currently not supported by SPICE models.
Power Modeling Manager
WEBENCH Design Center
All our existing models can be found here: www.ti.com.spicerack. From your message it looks like you have already visited this site. We have a lot of models available for analog converters/controllers which you can find here. Unfortunately, we do not have any spice models for digital controllers.
Some of the digital controllers are supported through the Digital Fusion Software. Although it does not provide SPICE simulation capability, it does provide help to configure the devices and setting up your systaem along with sample waveforms. Maybe this will help you with your problem.
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