PMP8740: PMP8740

Dania BATOOL

Part Number: PMP8740

Hi!
I am continuing the previous thread as follows
https://e2e.ti.com/support/tools/simulation-hardware-system-design-tools-group/sim-hw-system-design/f/simulation-hardware-system-design-tools-forum/1236578/pmp8740-pmp8740-rev_e-2kw-bc-boost-plus-auxiliary-power-supply/4682050?tisearch=e2e-sitesearch&keymatch=%20user%3A500631#4682050

after the recommended MOSFETs, I tried them and getting this output on the H-bridge with no load and no transformer or Inductor connected. but still I am getting some oscillations on the output of H-bridge. Can you guide me to proceed with testing on high voltage and then adding transformer as well on the PCB. as for Now I am trying on 12V to remove oscillations as they amplify if I increase my DC voltage on the H-bridge.

The output I am attaching is at around 70 KHZ and 170 KHZ

thank you

over 2 years ago

0 Roberto S. over 2 years ago

TI__Expert 6005 points

Hi Dania,

Can you please explain what you get on 12V (referred to "12V to remove oscillations as they amplify if I increase my DC voltage on the H-bridge").

Can you please refer to specific point on PMP8740 schematic (best if you describe voltages as differential potentials, like Vx - Vy).

By the way, small oscillations on H bridge are normal because there is no transformer connected, therefore the H bridge is running in hard-switching mode.

Regards,

Roberto

0 Dania BATOOL over 2 years ago in reply to Roberto S.

Prodigy 85 points

at this point I am giving 12V that mentioned in image and also last time i got recommendation that I should share my design files for review. can you tell me how to share personally because we cannot share the files on public post.

0 Roberto S. over 2 years ago in reply to Dania BATOOL

TI__Expert 6005 points

Hi Dania,

If you want you can share your email, and I will send you next feedback directly, so you can exchange your schematic.

Regarding the oscillations, first let's have a close look to your schematic and I will provide a quick feedback.

Thanks,

Roberto

0 Dania BATOOL over 2 years ago in reply to Roberto S.

Prodigy 85 points

Hello. My email id is daniabatool98@gmail.com. Thankyou

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PMP8740: PMP8740