Rohm SCT4026DRHR 5kW 800V三相输出LLC谐振转换器解决方案

Rohm公司的SCT4026DRHR是汽车级N沟SiC功率MOSFET,具有沟槽结构,750V和56A 4引脚THD通孔封装.满足资质AEC-Q101.器件能处理高压和大电流,满足各种条件下优化EMC噪音和电源效率.器件具有低开态电阻,快速开关速度和快速反向恢复.容易并联工作,驱动简单,无铅和RoHS兼容封装.主要用在汽车和开关电源.本文介绍了SCT4026DRHR主要特性,内部电路图以及采用SCT4026DRHR的LLC DC/DC转换器设计指标和5kW 800V三相输出LLC DC/DC谐振转换器主要特性和转换器PCB电路图.

SiC MOSFETs handle high voltage and high current and need to be evaluated under various conditions to determine the operating conditions for optimizing EMC noise and power supply efficiency. However, creating an appropriate evaluation environment is not an easy task. To solve this problem, we have prepared an evaluation board that allows you to easily set various conditions for evaluating the switching characteristics, so that you can efficiently evaluate SiC MOSFET

SCT4026DRHR主要特性:

1) Qualified to AEC-Q101

2) Low on-resistance

3) Fast switching speed

4) Fast reverse recovery

5) Easy to parallel

6) Simple to drive

7) Pb-free lead plating ; RoHS compliant

SCT4026DRHR应用:

・Automobile

・Switch mode power supplies

图1. SCT4026DRHR内部电路

Tc = 25°C时的最大指标值:

5kW 800V三相输出LLC DC/DC谐振转换器

In this application note, we will introduce a 5 kW LLC resonance-type DC/DC converter with three-phase output. The converter employs silicon carbide (SiC) MOSFETs for the switching elements and uses isolated transformers. Since the SiC MOSFETs have a breakdown voltage characteristic of 1,200 V, the input voltage can be increased up to 800 V. Employing switching frequencies of the transistors of approximately 200 kHz and 160 kHz for an input voltage of 600 V and 800 V, respectively, enables the isolated transformers and the input and output cap...