# PWM missing signal

**URL:** <https://forum.plexim.com/t/pwm-missing-signal/3343>\
**Category:** TI C2000\
**Created:** [October 14, 2026, 1:03am UTC](https://forum.plexim.com/t/pwm-missing-signal/3343 "2026-10-14T01:03:00Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![SAP](https://avatars.discourse-cdn.com/v4/letter/s/3da27b/32.png) [@SAP](https://forum.plexim.com/u/SAP)\
**Post date:** [October 14, 2026, 1:03am UTC](https://forum.plexim.com/t/pwm-missing-signal/3343/1 "2026-10-14T01:03:00Z")

</div>

Hi, I am using PLECS coder to code the TI launchpad F28069M. I set 7 outputs. For ePWM1A,1B,2A,3A, they are operating with 50kHz and ePWM Q4,Q5,Q7 are operating with 100kHz.

However when I see the signal through scope generated from TI controller, the PWM signals are missing in attached photo. (blue: ePWM6, green: ePWM5). Does anyone can help with this issue?

[Openloop\_code.plecs](https://forum.plexim.com/uploads/short-url/lgB9BrrN8Jk5PE5eE1GnTS6INoT.plecs) (25.5 KB)

 ![tek00081](https://europe1.discourse-cdn.com/flex006/uploads/plecs/original/2X/a/a00da7daed91903df0c3dd2fe9f09f0cf46da198.png)

---

<div class="post-metadata">

**Author:** ![Bryan\_Lieblick](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/bryan_lieblick/32/10_2.png) [@Bryan\_Lieblick](https://forum.plexim.com/u/Bryan_Lieblick)\
**Post date:** [October 14, 2026, 2:14pm UTC](https://forum.plexim.com/t/pwm-missing-signal/3343/2 "2026-10-14T14:14:16Z")

</div>

I haven’t programmed a C2000 device to verify this, but my initial suspicion is that your scope setup doesn’t have sufficient samples. With a fixed duty cycle you shouldn’t see the “fin-like” behavior in your waveforms so it’s probably aliasing.

Looking at your horizontal settings there are 200us/division, 500 kS/s, and a RL (record length) of 1kpts you’re dropping lots of data points. Zoom in, increase the sampling rate, increase record length and report back.