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UCC28950: Replacement of transformer with isolater

Sukhpal Singh
Prodigy 60 points
Part Number: UCC28950
Other Parts Discussed in Thread: UCC21520, , UCC27714

Dear sir 

  As I am designing a DC-DC Convertor using UCC28950PWR. For AC to DC Conversion we are using "Vienna Rectifier- Based Design". 

Please suggest a replacement for the Isolation Transformer with Digital Isolators.  

**Which Isolator we use to replace the Isolation Transformer.

Please find the design file attached herein.

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=CC9DC5B64794A42C

Part Manufacturer Part Number Quantity Price ($) Footprint (mm²) Description
T3 CUSTOM CUSTOM 1 NA NA Ns1toNp: 1   Ns2toNp: 1   Lp: 1.3 mH  
T2 CUSTOM CUSTOM 1 NA NA Ns1toNp: 1   Ns2toNp: 1   Lp: 1.3 mH  
T1 CUSTOM CUSTOM 1 NA NA Ns1toNp: 92.31 m  Ns2toNp: 92.31 m  Lp: 3.43 mH  
R3 CUSTOM CUSTOM 1 NA NA Resistance: 134.31 kΩ  Tolerance: 0.0%  Power: 0 W  
R23 CUSTOM CUSTOM 1 NA NA Resistance: 800 Ω  Tolerance: 0.0%  Power: 0 W  
R2 CUSTOM CUSTOM 1 NA NA Resistance: 134.31 kΩ  Tolerance: 0.0%  Power: 0 W  
R1 CUSTOM CUSTOM 1 NA NA Resistance: 134.31 kΩ  Tolerance: 0.0%  Power: 0 W  
M6 NA IdealFET6 1 NA NA VdsMax: 179 V  IdsMax: 93 Amps  
M5 NA IdealFET5 1 NA NA VdsMax: 179 V  IdsMax: 93 Amps  
M4 NA IdealFET4 1 NA NA VdsMax: 750 V  IdsMax: 9 Amps  
M3 NA IdealFET3 1 NA NA VdsMax: 750 V  IdsMax: 9 Amps  
M2 NA IdealFET2 1 NA NA VdsMax: 750 V  IdsMax: 9 Amps  
M1 NA IdealFET1 1 NA NA VdsMax: 750 V  IdsMax: 9 Amps  
Lout CUSTOM CUSTOM 1 NA NA L: 6.8 µH  DCR: 500 µΩ  IDC: 99 A  
L1 CUSTOM CUSTOM 1 NA NA Ns1toNp: 100   Lp: 20 mH  Leakage_L: 20 µH  
D14 CUSTOM CUSTOM 1 NA NA Type: ?  VRRM: 1.01 kV  Io: 6.31 A  
D13 CUSTOM CUSTOM 1 NA NA Type: ?  VRRM: 1.01 kV  Io: 6.31 A  
Cin CUSTOM CUSTOM 1 NA NA Cap: 744.56 µF  Total Derated Cap: 740 µF  VDC: 742 V  ESR: 135.38 mΩ  Package: null  

If we change these components with another value near to it is it going to affect my efficiency. 

Regards

Sukhpal Singh 

  • 0
    TI__Guru* 86236 points

    Hello.

    It looks like you created a Webench design and you would like to get a pre-designed transformer.  Generally the phase shifted full bridge designs require a custom transformer.  Generally the information that is provided by Webench is given to a magnetic design house such as Wurth, Renco or GCI and they will construct a transformer for this application based on the transformer information that is given from the Webench design tool.

    Regards,

  • 0 in reply to Mike O'
    Prodigy 60 points

    Hello Mike 

      I also mention I want to remove two transformers from the design as it's only used to trigger Mosfet. Is it possible i go with UCC21520. Please suggest to me how I can do this change.

    Regards

    Sukhpal Singh 

  • 0 in reply to Sukhpal Singh
    TI__Guru* 86236 points

    Hello,

    There is a PSFB EVM using the UCC28950 and the UCC27714 high side low side gate gate driver that may work for your application.

    https://www.ti.com/lit/ug/sluub02a/sluub02a.pd

    The UCC21520 with high voltage isolation will work as well for your design if you are trying to remove your gate drive transformer.

    Regards,