UCC5390ECDWVEVM: SN6505B Bias Supply not Outputting Expected

Skyler Krathwohl1

Part Number: UCC5390ECDWVEVM
Other Parts Discussed in Thread: SN6505B

I am trying to simulate the SN6505B Bias Supply using center-tapped, single output configuration. When applying 5V input I am expecting an 17V output, but I am only getting an 5V ouput.

Can you help me in understanding why I'm not getting the correct output?

I'm not sure how to change the winding's on the transformer (if that's the issue) because the PSpice script is encrypted.

See below for schematic, sims and configurations. Here's the EVM user guide: 8078.TI ucc5390-q1 Gate Driver User Guide.pdf

Thanks,

Skyler Krathwohl

Product Engineer

TE Connectivity

over 5 years ago

0 Skyler Krathwohl1 over 5 years ago

Prodigy 50 points

0 Skyler Krathwohl1 over 5 years ago in reply to Skyler Krathwohl1

Prodigy 50 points

This is the schematic for the EVM:

0 Skyler Krathwohl1 over 5 years ago in reply to Skyler Krathwohl1

Prodigy 50 points

Configurations:

0 Manuel Chavez over 5 years ago in reply to Skyler Krathwohl1

TI__Genius 17100 points

Hi Skyler,

Thank you for posting, and welcome to E2E!

Output voltage is dependent on the transformer turns ratio, so increasing the turns ratio to N ~= 3.5 would boost the output voltage level from 5V to ~17V. An unencrypted SN6505B model can be found here or in the PSpice for TI library.

Using the SN6505B from one of these two sources allows you to customize the surrounding components in the simulated system, including the transformers. TI does not provide models for transformers, but models of specific transformers can be imported or created for this software.

I will confirm whether we have generic center-tapped transformer models available in the software's library and follow up.

Thank you,
Manuel Chavez

Power management

Power management forum

UCC5390ECDWVEVM: SN6505B Bias Supply not Outputting Expected