SEC-6K6W-CLLC-GEVK: A reference design kit of the CLLC stage of 6.6kW OBC

The SEC-6K6W-CLLC-GEVK is a CLLC bidirectional DC-DC reference design for On Board Charging (OBC).
The reference design is made with multiple boards separating control from the power section.
This system uses the NVHL040N120SC1 & NVHL020N090SC1 automotive qualified SiC MOSFETs. SiC provides benefits that enable higher power density, higher switching frequency, and an extremely efficient design as compared to silicon solutions.
NCV57000 ICs provide galvanically isolated gate drive capability, separate drive outputs and fault detection with reinforced safety insulation.
The NCV4390 is used to control the CLLC topology, allowing bidirectional support via a MCU control pin to swap between grid to battery or battery to grid while maintaining proper output voltage and current.

Filling out the design, onsemi provides devices for the power rails (NCV890100, NCV4274, NCV8715), analog signal chain (NCV210, NCV2901, NCV2003, NCV33204), and several small signal devices such as BJTs, diodes and ESD protection.
Features and Applications


  • Bidirectional functionality
  • Excellent transient response
  • Best-in-class efficiency
  • Improved light load efficiency
  • Monotonic rising output
  • Improved output voltage ripple


  • High power density
  • High efficiency
  • Unique voltage balancing solution


  • On Board Charing (OBC)
  • Bidirectional DC-DC
Evaluation/Development Tool Information
Product Status Compliance Short Description Parts Used Action
A reference design kit of the CLLC stage of 6.6kW OBC 2V7002LT1G BAS16HT1G
NCV33204DR2G NCV4390DR2G
Technical Documents
Type Document Title Document ID/Size Rev
Eval Board: Schematic 6K6W-CLLC-RESONANT Tank Schematic 6K6W-CLLC-RESONANT_TANK_SCHEMATIC.pdf - 15 KB  0 
Eval Board: Schematic SEC-6K6W-CLLC-CTRL-GEVB Control Board Schematic SEC-6K6W-CLLC-CTRL-GEVB_CONTROL_BOARD_SCHEMATIC.pdf - 415 KB  0 
Eval Board: BOM SEC-6K6W-CLLC-PB-GEVB Bill of Materials (ROHS Compliant) SEC-6K6W-CLLC-PB-GEVB_BOM_ROHS.pdf - 307 KB  1 
Eval Board: Schematic SEC-6K6W-CLLC-PB-GEVB Power Board Schematic SEC-6K6W-CLLC-PB-GEVB_POWER_BOARD_SCHEMATIC.pdf - 1070 KB  0 
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