This reference design is a high-density and high-efficiency 8kW power supply. The first stage is a triangular conduction mode (TCM) power factor correction (PFC) converter followed by a delta-delta connected three-phase inductor-inductor-capacitor (LLC) converter. Both power stages are implemented with TI high-performance Gallium Nitride (GaN) power switches. The PFC uses a three-phase totem pole PFC in a zero-current detection (ZCD) based control mechanism. The control method operates with variable frequency and maintains zero voltage switching (ZVS) overall operating conditions. The control is implemented with a TMS320F280039C high performance microcontroller and the LMG3527R030 GaN field-effect transistor (FET) with integrated ZCD sensing. The operating frequency range of the converter is approximately between 70kHz and 1.2MHz. The LLC operates between 200kHz and 1.5MHz. The delta-delta resonant tank connection provides reduced root-mean-square (RMS) currents. Control is implemented with a TMS320F28P550SJ high-performance microcontroller. The LLC uses LMG3527R030 GaN FETs on the primary and LMG3100R017 GaN FETs on the secondary.
| Output voltage options | PMP23547.1 | PMP23547.2 |
|---|---|---|
| Vin (Min) (V) | 180 | 440 |
| Vin (Max) (V) | 305 | 460 |
| Vout (Nom) (V) | 450 | 48 |
| Iout (Max) (A) | 18 | 170 |
| Output Power (W) | 8100 | 8160 |
| Isolated/Non-Isolated | Non-Isolated | Isolated |
| Input Type | AC | DC |
| Topology | Boost- PFC | Full Bridge- LLC |
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Test results for the reference design, including efficiency graphs, test prerequisites and more
Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| Test report | GaN-Based 8kW 3-Phase Totem-Pole PFC and 3-Phase LLC Reference Design | PDF | HTML | Mar. 10, 2025 |
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