Toshiba Electronics Europe GmbH (“Toshiba”) has introduced six new products featuring the DTMOSVI 600V series of N-channel power MOSFET chips housed in a 4-pin TO-247-4L(X) package. These advanced TKxxxZ60Z1 devices are engineered to significantly reduce switching losses. They are ideal for demanding applications such as data center servers, switched-mode power supplies (SMPS) for industrial equipment, and power conditioners for photovoltaic (PV) generators.
The DTMOSVI 600V series is designed with an optimized gate structure and manufacturing process, resulting in a roughly 13% reduction in drain-source on-resistance (RDS(ON)) per unit area. Furthermore, the series achieves about a 52% reduction in the critical figure of merit (FOM), calculated as RDS(ON) multiplied by gate-drain charge (Qgd), compared to Toshiba’s previous generation DTMOSIV-H series with equivalent 600V drain-source voltage ratings. For example, the TK024Z60Z1 variant features a typical RDS(ON) of 20mΩ and a Qgd of 37nC. This improvement provides a better balance between conduction loss and switching loss, directly enhancing the efficiency of switched-mode power supplies.
The new products incorporate a four-pin TO-247-4L(X) package, which includes a dedicated signal source terminal for the gate drive. This design enhancement significantly reduces the impact of switching due to the inductance of the source wire inside the package, a common issue in conventional three-pin packages. In three-pin packages, the inductance of the source wire generates a counter electromotive voltage that reduces the effective gate drive voltage, thereby slowing down the switching speed of the MOSFET. By contrast, the four-pin package connects the signal source terminal close to the FET chip, thereby mitigating this effect and allowing the voltage applied between the gate and source to be approximately equal to the gate drive voltage. This enhancement improves the switching speed and enhances high-speed switching performance, contributing to the high efficiency required in applications such as servers, uninterruptible power supplies (UPS), and photovoltaic inverters. However, it is important to note that the TO-247-4L(X) package has a different appearance and dimensions compared to Toshiba’s existing four-pin TO-247-4L package, as it features the cavity between the drain and source pins to increase creepage distance.
Toshiba continues to support circuit designers by offering a range of tools, including the G0 SPICE model for quick circuit function verification, and highly accurate G2 SPICE models that precisely reproduce transient characteristics.
Toshiba is committed to expanding its DTMOSVI 600V series lineup further, contributing to the ongoing improvement of power efficiency in electronic equipment.
