UCC256404: UCC256404

Hi Sam,

You can use voltage regulator circuit in order to generate a 15V from the LLC output. That 15V can be used inorder to supply the UCC24624 VDD rail.

Please see the following reference designs where voltage regulator being used for powering up the SR controller from LLC output voltage.

TIDA-010015 Schematic and Block Diagram

TIDA-01495 Schematic and Block Diagram (Rev. A)

Regards

Manikanta P

Hi Sam,

Since I have already answered your question through phone, I am closing this thread. Please create a new thread for all pfc related questions.

Regards

Manikanta P

Hi Sam,

In PFCLLCSREVM034 Schematic , LL/SS pin is connected to RVCC through resistor divider. Its not connected to anywhere else in the schematic. 

whereas PMP30763, the LL/SS pin is also connected to external overload protection as shown below.

You can refer any of these schematics for you prototype development.

Regards

Manikanta P

Hi Sam,

The VCC is not emulated in the model. So, you do not need to connect any source to the VCC pin while doing the simulation.

Regards

Manikanta P

Hi Sam,

Please find the attached simulation file:

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/SAM_5F00_UCC25640x-Simulation-Test-Bench.sxsch

Regards

Manikanta P

Hi Sam,

Please see the attached file that generates bode plot.

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/2318.SAM_5F00_UCC25640x-Simulation-Test-Bench.sxsch

Regards

Manikanta P

Hi Sam,

The file that I have attached in my last thread, was able to generate the bode plots.

In order to generate the bode plots, follow the below steps:

1. First, you need to run the transient analysis.

2. After completion of transient analysis (without closing any tabs of the simplis), you need to disable the transient analysis and enable the AC analysis. 

Regards

Manikanta PUCC25640x Simplis Model_APL.zip

Hi Mani

Thank you so much for the help

Both the circuits are working

Regards

Sam