本應用筆記展示出基於eGaN FET的非隔離型、已調節型的48 V – 12 V中間匯流排轉換器的優化系統可以實現更高的功率密度及效率。此外，與傳統的矽基解決方案相比，我們探討基於eGaN FET的多級拓撲可進一步發揮eGaN FET的優勢。
In this application note, we introduce EPC’s new eGaN IC – EPC2112 that includes an integrated gate driver used in a 27 W, 14 V – 48 V input to 19 V output single-ended primary-inductor converter (SEPIC) built on the EPC9131 demonstration board. The SEPIC converter is ideal for applications with a wide input voltage range and where the output voltage can be either below or above the input voltage.
Lidar is a form of radar where the electromagnetic radiation happens to be in the optical band [1, 2]. In the last few years, one particular form of lidar, time-of-flight (TOF) distance measurement, has become popular. If a laser is used as the optical source, one can measure the distance of a small spot even at a long range. When combined with steerable optics, one can sweep the spot distance measurement and map objects in 3-D space.
In this application note, we introduce two class-E amplifiers designed, built and tested using EPC’s gate driver integrated FETs the EPC2112 and EPC2115 for operation as an AirFuel™ Alliance compatible wireless power amplifier. Highly resonant wireless power systems operate at 6.78 MHz and eGaN® FET’s have proven to yield higher efficiency and power density designs over MOSFET versions. The ability to integrate multiple devices, performing additional functions such as synchronous bootstrapping, on a single monolithic substrate has further enhanced the performance of wireless power amplifiers.
Resonant wireless power systems use loosely-coupled, highly-resonant coils that are tuned to high frequencies (6.78 MHz or 13.56 MHz). The AirFuel Alliance has developed the standard for resonant wireless power applications. They address convenience-of-use issues such as source to device distance, device orientation on the source, multiple devices on a single source, higher power capability, simplicity of use, and imperfect placement.
Modern communication systems demand high data capacity and high speed. The long-term evolution (LTE) standard for the fourth-generation (4G) and the fifth-generation (5G) wireless systems requires signals with higher PAPR compared with prior generations. This increase reduces the efficiency of the power amplifier (PA). Envelope tracking, or supply modulation, uses a dynamic power supply to vary the PA supply voltage in accordance with the time-varying envelope of the input signal so that the efficiency of the PA is maximized.
Photo-Voltaic (PV) inverter size and cost are dominated by thermal management and passive elements used for bulk energy storage and filtering. Using eGaN FETs to increase efficiency and/or increase switching frequency will reduce the size and cost of the system.
Even though the eGaN FET was designed and optimized as a power-switching device, it also exhibits good RF characteristics. EPC’s small 200 V eGaN FET was selected for RF evaluation and should be viewed as a starting point from which the RF characteristics of future eGaN FET part numbers can be optimized for even better RF performance at higher frequencies.
In this white paper eGaN FET technology is applied in a high frequency resonant converter. Previously, the advantages provided by eGaN FETs in hard switching isolated and non-isolated applications were addressed. This paper will demonstrate the ability of the eGaN FET to improve efficiency and output power density in a soft switching application, as compared to what is achievable with existing power MOSFET devices.
DC-DC converter designers can achieve higher power density at lower power levels by using forward converters with synchronous rectification and gallium nitride transistors. One very typical application is a 26 W, 48 V to 5 V , Power over Ethernet Powered Device (PoE-PD).
DC-DC converter designers can achieve low cost at low power densities by using flyback converters and enhancement mode gallium nitride transistors. To evaluate the performance of eGaN FETs in a flyback converter, two different converter designs were created and compared to MOSFET equivalent versions of the same design.
Improvements in buck converters over the past few years have been limited by the power MOSFET’s sedate switching speeds which, in this “hard-switched” topology, translates into lower power conversion frequencies (size and cost), lower efficiency (size and cost), and lower VIN/VOUT ratios (less efficient power management systems). In this paper we show that eGaN FETs unlock a new spectrum of performance that can be translated into significant power conversion system cost and performance improvements.