Hello;
I try to use Front End 2 RAMP module to softly turn off the sync FET in light load mode on UCD3138HSFBEVM-029 (full-bridge hard-switching) board.
When the duty of sync FET(DPWMB) decreases to nearly zero, there will be some noise on DPWMA signal, please see the picture below:
Channel 1(yellow) is DPWMA, and Channel 2(green) is DPWMB
code as below:
FeCtrl2Regs.RAMPDACEND.bit.RAMP_DAC_VALUE=0; FeCtrl2Regs.RAMPCTRL.bit.SYNC_FET_RAMP_START = 7000; FeCtrl2Regs.DACSTEP.bit.DAC_STEP = 10;
How can I fix it please? Thank you very much!
