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WEBENCH® Tools/LM26400Y: Duty Cycle issue

Part Number: LM26400Y

Tool/software: WEBENCH® Design Tools

Hi,

 when I tried to simulate the design using Webench tool with following input parameters, its popping up an error"Design cannot be created with this device look for alternate device", but the  datasheet shows it supports maximum duty cycle of 96%, Can you please let me know why design is not being created with below inputs in Webench tool, 

Regulator1#:

Input volatge: 4.5V to 13V

Output Volatge: 3.3V

Output Current: 1A

Regulator2#:

Input volatge: 4.5V to 13V

Output Volatge: 1.8V

Output Current: 1A

Regards,

Venkat