semiconductor

SiC MOSFETs (1700V)：Survey report on SiC transistors used in 1000V input DC-DC (Flyback) converters

Q1 in the schematic
represents a high voltage
switching transistor, and
Q1 is the subject of this
report.

Background

There is a growing interest in 1000V input DC-DC converters for automotive applications, with rated power below 150W used as auxiliary power supplies, primarily for the flyback topology. Some companies are increasing the voltage rating of their flyback converters by using 1700V SiC transistors

・ROHM BM2SC124FP2-LBZE2

・Power Integrations (PI) INN3949QC

・Navitas: Acquisition of SiC MOSFET manufacturer GenSiC

Companies offering 1700V SiC transistors for this category are ROHM, INFINEON, WOLFSPEED, MICROSEMI, GeneSiC, and QORVO.

Report contents (61 pages)

This report investigates the implementation of 1000V input quasi-resonant (QR) flyback converters using 1700V SiC switching transistors and their associated features for the three configurations shown in Table 1 above. The products covered are:

(1) Infineon 1700V CoolSiC,

(2) ROHM 1700V SiC on BM2SC124FP2-LBZE2

(3) Power Integration’s INN3949CQ converter

The manufacturing costs are also evaluated and compared considering physical structure analysis.

This report provides useful information for technology evaluation and trends, as well as manufacturing cost evaluation.