A Power MOSFET Array is a component that integrates multiple Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) into a single package or circuit arrangement, designed to handle high power levels. In an Active Load system, it serves as the primary switching and current-handling element, simulating various load conditions for testing power supplies, batteries, and other electrical systems by dynamically adjusting resistance and power dissipation. The array typically contains 2 to 8 channels, allowing for higher current handling and improved thermal distribution compared to single MOSFET implementations. Key parameters include drain-source voltage (30–100 V), continuous drain current (5–50 A at 25°C case temperature), power dissipation (2–150 W per package), on-resistance (5–100 mΩ at VGS = 10V and rated current), gate threshold voltage (1–4 V at ID = 250 µA), operating temperature range (-55 to 150°C), input capacitance (500–5000 pF at VDS = 25V, VGS = 0V, f = 1MHz), and switching frequency (100–1000 kHz typical for hard-switching applications). Common package types include SOIC-8, SOIC-16, DIP-8, and DIP-16. The ESD rating (Human Body Model) ranges from 2000 to 8000 V per IEC 61340-3-1, and typical package weight is 0.1–2.0 g. Materials used include silicon (semiconductor), copper (leads/terminals), epoxy molding compound (packaging), and aluminum (heat spreader). These arrays are used in applications requiring precise load simulation, such as power supply testing, battery testing, and electronic load systems. When selecting a Power MOSFET Array, verify model-specific values and standards with the legal manufacturer or supplier, as the ranges provided are directory references and not guarantees of performance for a specific part.
The Power MOSFET Array operates by using voltage applied to the gate terminal to control the current flow between the drain and source terminals. In an Active Load application, a control circuit modulates the gate voltages of multiple MOSFETs in the array to create precise, programmable load characteristics. The parallel configuration allows for higher current handling and better thermal distribution compared to single MOSFET implementations. By adjusting the gate voltages, the array can simulate resistive, constant current, constant power, or dynamic loads, enabling comprehensive testing of power sources.
