SECO-HVDCDC1362-15W-GEVB is highly efficient andprimary-side regulated (PSR) auxiliary power supply targeting HEVand EV automotive power trains. The design provides a stable 15 Voutput and 15 W over a wide input DC voltage range from 250 V to900 V, and is therefore suitable for 400 V and 800 V battery systems.The board employs the NCV1362 quasi-resonant peak current PSRflyback controller, the 3-lead cost-optimized NVHL160N120SC1160 m 1200 V silicon carbide (SiC) MOSFET, and theFFSD0665B-F085 SiC diode.
Thanks to the high blocking voltage capabilities and ultra-low gatecharge (34 nC) value of the SiC FET, the switching losses aresignificantly reduced, and the board exhibits a superior efficiency forthe application up to 86% in low line input conditions. The notabledriving capabilities of the NCV1362 controller allows for directoperation of the SiC FET at 12V without a pre-driver, simplifying thelayout and cutting down the component count.
The flyback transformer provides 4 kV isolation and is optimized tominimize the losses on the RCD snubber. Consequently the systemeffectively dampens the drain voltage overshoot at high line, andprovides 100 V margin for the SiC FET. The board is fully realizedwith automotive qualified semiconductors and passive devices.Industrial grade replacements are also available.