This "Tip of the Day" video focuses on the IRF830, an N-channel MOSFET from Vishay Silicon (originally International Rectifier). The speaker reviews its key specifications from the datasheet, including its 500V voltage rating, 4A continuous current capability, and on-resistance (stated as 1.2 ohms on the package, but later measured much lower). Datasheet concepts like power derating and characteristic graphs are discussed. A simple test circuit is then demonstrated, using a 500-ohm resistor as a load and a 100V power supply. The MOSFET is driven with a 10V gate signal, and its switching behavior and drain-source saturation voltage are measured. The experiment confirms the component functions effectively as a high-voltage switch, achieving a low saturation voltage of approximately 0.2V when fully turned on, demonstrating its suitability for high-voltage switching applications.
Exploring the IRF830 MOSFET: Datasheet Review and Practical Test
0:07 Component Introduction: The video introduces the IRF830, an N-channel MOSFET from Vishay Silicon (originally International Rectifier).
0:26 Key Specifications: The IRF830 is highlighted for its high voltage rating of 500V and its stated on-resistance of 1.2 ohms.
0:50 Datasheet Review: The speaker discusses interpreting the datasheet, noting the continuous current capability (~4A) and total power dissipation (74W, which needs significant derating for practical use, estimated around 20W).
1:33 Datasheet Graphs: The importance of characteristic graphs, such as drain current versus drain-source voltage at different gate voltages, is mentioned for understanding component behavior.
2:19 Test Circuit: A simple test circuit is shown, consisting of the IRF830 MOSFET, a 500-ohm load resistor, and connections for a power supply and control signal.
4:05 Test Setup: The practical setup involves a power supply providing 100V (drain-source) and a 10V gate drive signal.
4:47 High-Voltage Switching Test: Activating the gate with 10V successfully turns the MOSFET on, demonstrating its ability to switch the 100V load and drawing 0.2A through the 500-ohm resistor, confirming its function as a high-voltage switch.
5:04 Saturation Voltage Measurement: When the MOSFET is turned on ("hard on"), the drain-source voltage drops significantly.
5:21 Low Saturation Voltage: The measured drain-source saturation voltage when the MOSFET is switched on is approximately 0.2-0.25V, much lower than expected from the simple on-resistance * current calculation, indicating it effectively conducts current with minimal voltage drop.
5:27 Effective High-Voltage Switch: The practical test confirms the IRF830 works well as a switch for high voltages like 100V.