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TPS40211 LEDs are PWM dimming

Hi All

I'm designing PWM dimmable LED driver with TPS40211. You can find my schematic attached.

Input Voltage : 9 - 14 V (3 cell Lipo)
Output Voltage : 38- 40 V
Output Current : 3 A

Working Frequency : 400 kHz

PWM dimming frequency : 300 Hz

Under say that no way in the circuit right now, I have a 12V output and 1.5A. ??