The maximum junction temperature (Tj) of the AUIRF4905 is 175°C. However, it's recommended to keep the junction temperature below 150°C for reliable operation and to prevent thermal runaway.
The maximum current rating of the AUIRF4905 depends on the package type and the thermal conditions. You can use the thermal resistance (RθJA) and the maximum junction temperature to calculate the maximum current rating. For example, for the TO-220 package, the maximum current rating is approximately 49A at a case temperature of 25°C.
The recommended gate drive voltage for the AUIRF4905 is between 10V and 15V. However, the minimum gate drive voltage required to turn on the device is around 4V. It's recommended to use a gate drive voltage of at least 10V to ensure reliable operation and to minimize switching losses.
Yes, the AUIRF4905 can be used in a synchronous buck converter. However, you need to ensure that the device is properly driven and that the dead time between the high-side and low-side switches is minimized to prevent shoot-through currents. Additionally, you may need to add a Schottky diode in parallel with the low-side switch to prevent reverse recovery losses.
To minimize parasitic inductance and ensure reliable operation, it's recommended to follow good PCB layout practices, such as keeping the high-current paths short and wide, using a solid ground plane, and placing the gate drive components close to the MOSFET. Additionally, you should use a low-inductance package such as the TO-220FP or the D²PAK, and consider using a Kelvin connection for the source pin.
AUIRF4905 datasheet
by International Rectifier
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