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UCD3138PSFBEVM-027: UCD3138PSFBEVM-027

Part Number: UCD3138PSFBEVM-027

Tool/software:

The calculated Shim Inductor value is 82nH as per the equation given in the application report( UCC28950 600W Phase Shifted Full Bridge Design Review/Application Report (Rev. D) .This was too small value and which doesn’t make sense for circuit so we referred research paper(https://www.researchgate.net/publication/312562423_Design_and_simulation_of_phase-shifted_full_bridge_converter_for_hybrid_energy_systems ) and got 5uH value . In 5uH we were not able get 196.8 V for max duty cycle So we tuned Shim Inductance for better efficiency and need to get stable output upto 4KW . We can able to  load upto 4KW with 0.2uH shim  as well as without Shim.

Shim Inductance Design Specification

S:NO

Parameter

Value

1

Transformer Leakage Inductance

10nH - 150nH

2

Nominal Mosfet Ouptut Capacitance (Coss_Nom)

2496pF

3

Maximum Mosfet Ouptut Capacitance (Coss_Max)

1920pF

4

Dead time

500ns

Is it okay to go ahead without Shim (only with transformer leakage inductance 150nH) . Kindly suggest better with 0.2uH shim or without shim from Ti side.

 General Specification:

Input Voltage - 51.7V

Output Voltage -196.8V

Output Current -20A

Input Avg Curr - 120A