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TPS63806: Please help to sovle how to adjust a special current output via FB+ RC

Part Number: TPS63806

Currently I want to use TPS63806 to drive LED with 3.4A .Input is 3.6V,output requires 3.7V 3.4A.My control logic is that  connect the IC FB pin with a RC(24K,1uF) circuitry, that MCU output a 8K PWM to one side of the R r adjusting the output voltage.At firstly, I disconnect the R with the MCU PWM output pin,and make the R one side connect GND(simulate the duty is 0%), IC  current output reach 3.4A.But when I connect the R wiht MCU PWM pin,and then adjust the duty cycle from 20% to 0%, but the output current can't reach 3.4A, only stay at 2.7A.How can I solve this problem?Need your help.