FRED for High-Power Systems

PANJIT's fast recovery epitxatial diode (FRED) Gen.1 with optimized product line up satisfies the needs from various power conversion circuits such as Boost PFC, Vienna PFC, Boost converter, etc. Suitable FRED characteristics should be chosen by the different switching frequency applications. FRED has a trade-off relationship between V_F and Q_RR because high doping concentration at the epi layer is needed for lower Q_RR, but it will cause higher V_F. Therefore, optimization of FRED performance is one of the key design points that should be considered.

PANJIT FRED Gen.1 has 2 types of FREDs; Speedy FRED and Optima FRED. Speedy FRED has minimized Q_RR and is recommended for high-frequency switching applications such as CCM Boost PFCs, Vienna PFCs, and boost converters. Optima FRED has reduced V_F and is recommended for low-frequency and high-conduction applications like CrCM and DCM boost PFC, ORing, and line grid rectification.

PANJIT provides various FRED products for system designers to choose a proper FRED for their applications. PANJIT FRED Gen.1 line-up comes with breakdown voltages of 650 V, 1,000 V, and 1,200 V, current rating of 8 A to 60 A, and various discrete packages such as TO-220AC, ITO-220AC, TO-263, TO-247AD-2LD, and TO-247AD-3LD.