6.6 kW bidirectional GaN OBC: 2-phase totem-pole PFC + CLLLC
← All reference designs · Vendor page: TI PMP22650
| Hardware | files-only |
|---|---|
| Status | active |
| Application | ev-obc |
| Semiconductors | GaN |
| Key devices | LMG3522R030-Q1, TMS320F28388D |
| Deliverables | schematic, bom, layout, test-report |
| Conversion | AC-DC |
| Topology | totem-pole-pfc, clllc |
| Power (W) | 6600 |
| Power basis | output |
| Input | 210–240 V AC |
| Output | 250–450 V DC |
| f_sw (kHz) | 120 (vendor-claimed) |
| f_sw note | PFC 120 kHz; CLLLC 200–800 kHz variable (frequency + phase modulation) |
| Peak efficiency | 96.50 % (vendor-claimed) |
| Efficiency conditions | System (AC to DC, PFC + CLLLC), peak. Full 6.6 kW above 210 Vrms; tested from a 240 Vac source. |
| Bidirectional | yes |
| Interleaved | yes |
| Control | kind: digital; part: C2000 TMS320F28388D (single core runs PFC + CLLLC) |
| Density (kW/L) | 3.8 (vendor-claimed) |
| Density basis | open frame (62.5 W/in³) |
| Loss at peak η | 239.4 W (calculated, at rated power) |
| Last verified | 2026-10-21 |
Notes
Why it is interesting: synchronous rectification in the CLLLC is timed from Rogowski-coil current sensors read by the same MCU core that runs both stages, which is unusual and worth studying. The GaN FETs have integrated drivers, and at 200–800 kHz the CLLLC shows what GaN does to OBC magnetics size.
Watch out: the hardware is not for sale. vin.max = 240 V is the tested source voltage, not a stated upper limit, and the lower bound is the full-power threshold (210 Vrms). TI positions it as a starting point for 7.2–7.4 kW designs on a 240 V / 32 A breaker.
Tags: rogowski-sr-sensing · single-mcu-two-stages · high-frequency-gan