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UCD3138: How to increase the maximum duty cycle of UCD3138?

Part Number: UCD3138

Hello 
When I tested the UCD3138 full-bridge hard switch development board,

I found that the UCD3138's PWM duty cycle is 45% when the main power is not applied.

Is this the set maximum duty cycle?

If I want to increase the maximum duty cycle to 47%, where does the firmware change?

Thank you