Unleashing Power Efficiency: A Deep Dive into the onsemi FDD2572-F085 200V SuperFET 8 MOSFET

In the realm of power electronics, efficiency, thermal performance, and reliability are paramount. The onsemi FDD2572-F085 stands as a pinnacle of this pursuit, a 200V N-Channel MOSFET engineered with the advanced SuperFET 8 technology. This device is specifically designed to minimize switching and conduction losses in high-power applications, making it an exceptional choice for designers pushing the boundaries of performance.

Decoding the SuperFET 8 Advantage

The "SuperFET 8" is not just a name but a signature of onsemi's latest MOSFET innovation. This technology represents a significant leap forward, offering an exceptional figure-of-merit (FOM) that translates into lower gate charge (Qg) and reduced on-resistance (RDS(on)). For the FDD2572-F085, this means an ultra-low RDS(on) of just 8.5 mΩ (max. at VGS=10 V), which directly minimizes conduction losses. Coupled with its fast switching characteristics, this MOSFET significantly enhances overall system efficiency, reduces heat generation, and allows for higher switching frequencies, which can lead to smaller magnetic components in power supplies.

Pinout Configuration and Package

The FDD2572-F085 is housed in a robust TOLL (TO-Leadless) package. This surface-mount package offers a compact footprint while providing superior thermal performance compared to traditional packages like DPAK or D2PAK. Its leadless design minimizes parasitic inductance, which is crucial for high-speed switching operations.

The pinout is straightforward:

Pin 1 (Gate): The control pin. A voltage applied between the Gate and Source activates the device.

Pin 2, 3, 6, 7 (Drain): These pins are internally connected to the MOSFET's drain terminal. The multiple connections help in reducing current density and improving thermal dissipation.

Pin 4, 5, 8 (Source): These pins are internally connected to the source terminal, serving as the return path for current.

Key Datasheet Specifications at a Glance

Drain-to-Source Voltage (VDS): 200 V

Continuous Drain Current (ID): 120 A @ TC=25°C

On-Resistance (RDS(on)): 3.8 mΩ (typ.) / 8.5 mΩ (max.) @ VGS=10 V

Gate Threshold Voltage (VGS(th)): 2.5 V (typ.)

Total Gate Charge (Qg): 92 nC (typ.) @ VGS=10 V

Avalanche Energy Rating (EAS): 960 mJ

Application Circuit: A Simplified SMPS Example

A primary application for the FDD2572-F085 is in the primary side of Switch-Mode Power Supplies (SMPS), such as active power factor correction (PFC) circuits and half-bridge or full-bridge topologies. Below is a simplified concept of its role in a PFC stage.

In this circuit, the MOSFET acts as the main switching element. A dedicated gate driver IC is essential to rapidly charge and discharge the significant gate capacitance of the MOSFET, ensuring fast turn-on and turn-off transitions. The driver, controlled by a PFC controller IC, provides the necessary current to swiftly move the MOSFET through its switching cycle, minimizing the time spent in the linear region where power loss is highest. A low-ESR electrolytic or ceramic capacitor placed close to the drain and source pins helps to smooth voltage spikes. A snubber network (RC circuit) across the drain and source might also be used to suppress any high-frequency ringing and voltage transients, protecting the device from overvoltage stress.

ICGOODFIND Summary

The onsemi FDD2572-F085 is a high-performance powerhouse leveraging SuperFET 8 technology to deliver industry-leading efficiency in a compact TOLL package. Its ultra-low RDS(on) and excellent switching characteristics make it an ideal solution for demanding applications like server and telecom power supplies, industrial motor drives, and solar inverters. By significantly reducing power losses, it enables designers to create systems that are cooler, more reliable, and more energy-efficient.

Keywords:

SuperFET 8 MOSFET

200V Power MOSFET

Low RDS(on)

Switch-Mode Power Supply (SMPS)

TOLL Package