TIDA-010042: HIN and LIN signal from msp430f5132 is sometimes becoming high simultaneously during switching

Tool/software:

Hi,

In TIDA-010042(msp430f5132 based design), I have changed the timer D mode from up mode to up/down mode .The reason for change was to enable deadband (312ns) on both sides of pwm signal.

Now we are facing two issues:

1.During Buck enable after disabling, a high current is flowing.

Currently only one phase is enabled in interleaved.

#define BUCK_DISABLE    TD0CCTL1 = TD0CCTL2 = OUTMOD_0;\
                        TD1CCTL1 = TD1CCTL2 = OUTMOD_0;     // Turn PWM outputs off
#define BUCK_ENABLE     TD0CCTL1 = OUTMOD_6;\
                        TD0CCTL2 = OUTMOD_2;

When we analysed the signals and we found that high side and low side signal from microcontroller is becoming high causing both fet to turn on at the same time.Please see the attached screenshot of waveform of SW node during this time.

Yellow- 3.3V(ground bouncing), Blue-SW Node

2.We tried full time enabling of buck(no disabling)- By this modification, the issue was almost gone, but even after that at sometimes, the issues comes again.

Please see the attached screenshot of waveform of high and low side signal from microcontroller during the issue.

Yellow is high side signal and blue is low side signal

Do you know what may be the reason for this?

Regards,

Cyril