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UCC21222-Q1: Switching frequency

Part Number: UCC21222-Q1

Hi, 

I am using UCC21222-q1 in our project application. Following is the test condition used: VDDA= 15V; VCCI = 5V; INA = INB = 3.3 V at 20kHz switching frequency with 87% duty cycle on INA and 1 % duty cycle on IN B. However it is observed that  OUT B signal is lesser and in the range of 9V while the expected value is around 13V. Could you please explain the deviation? Is it because of the dutycycle?