ROHM’s New 4th Gen Fast Recovery Diodes Deliver Low Loss Performance Together with Ultra-Low Noise Characteristics

PublishTime： 2022-07-18 Article Source：ROHM

ROHM has developed its 4th Generation 650V fast recovery diodes (FRDs), the RFL/RFS series, featuring low forward voltage (V_F), fast reverse recovery time (t_rr) respectively, as well as ultra-low noise characteristics. The new devices are ideal for industrial and consumer equipment that handle large amounts of power, such as air conditioners and EV charging stations.

In recent years, more effective use of electricity is necessary to cope with the rise in global power consumption. This is especially true for white goods and industrial equipment that handle large amounts of power such as EV charging stations. These require not only high electrical efficiency but also reduced workload for noise countermeasures in circuit design. In response, ROHM developed diodes that combine low V_F for more efficient operation with fast t_rr characteristics that provide less loss and ultra-low noise during switching OFF.

Optimizing the device structure and materials allows the RFL/RFS series to achieve the optimum balance of V_F and t_rr, which are important characteristics for FRDs but are in a trade-off relationship. The low V_F RFL series reduces V_F by approx. 3.2% and trr by about 8.3% over the conventional RFN series, while the high-speed RFS series decreases V_F by approx. 17.9% vs the conventional RFUH series. Both products contribute to higher power supply efficiency through optimal design based on circuit requirements. Furthermore, ultra-low noise diode recovery characteristics are achieved, they help to reduce both workload and components for noise.

Going forward, ROHM will continue to expand the package lineup of the RFL/RFS series to provide automotive support while expanding applicability by reducing power consumption.

Applications

・PFC (Power Factor Correction) circuits in air conditioners, washers, refrigerators, etc.

・Secondary rectifier circuits in EV charging stations and the like

・Inverter circuits in machine tool robots, compressors, etc.

・Power supplies for servers, base stations, and more.

Circuit (Topology) Examples

Product Lineup

RFL Series (Low V_F Type)

RFS Series (High-Speed t_rr Type)

Topology Selection

When designing power supply circuits, it is necessary to select a circuit configuration (topology) that matches the required specifications for input/output voltages, power, isolation, and other factors.

Terminology

V_F / t_rr Characteristics

V_F (forward voltage) is the voltage between the diode terminals generated from current flow in the forward direction. The lower this value, the more efficient the application operation.

t_rr (Reverse Recovery Time) is the time it takes to switch from the ON state to completely OFF. The lower this value is, the smaller the loss during switching.
V_F and trr are key characteristics related to diode loss and are in a trade-off relationship.

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