TMS320F28335: Delay in PWM signals

ello everyone,

I want to program the card TMS320F28335 so that it can give as output two signals ePWM1X and ePWM2X. The isssue that I'm having is that these two signals are delayed with a value of 3.84us even if my program doesn't include this delay (I'm assuming it's a hardware issue). I used the deadband option in the ePWM bloc, which erased the delay from the "left" side of the pulse, while the one on the right remained. What are the solutions that I can implement in my program to fully get rid of this delay between the two signals ?

You can see below the two signals. (yellow is the signal epwm1A, blue is the signal epwm2A)

[Mohammad Tauquir Iqbal]

can you explain little bit more. how you generate PWM. and aaatch your file as well ?

[vishnu vardhan reddy]

could you please provide your working model once

Email : [e-mail]

[Sinan Yücetepe]

hello did you solve your problem ?

Answer 1

[Simon]

Hi Mohammed,

many driver boards (hardware circuit which controls your MOSFETS / IGBTS) have a hardware dependend delay implemented which delays the high-side gate signals (of your PWM signal) in order to prevent a short through in your bridge. You can usually only change or remove this delay by removing the corresponding resistors from your driver board.

I would suggest that you have a look on your harware setup first, in particular the driver board datasheet.

Good luck!

Simon

Answer 2

[Andrey Er]

Good day.

You can buypass deadtime generator on MCU usuing right settings for PWM regs, or try use small values of Dead time Time register for example 1.