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Using a MOSFET as a load device with current regulation in its linear region (also known as the active region) means the MOSFET is acting more like a variable resistor than a switch. This mode of operation can lead to significant heat generation because power dissipation increases due to the voltage drop across the MOSFET. Here’s the breakdown: Key Parameters 1. Drain-Source Voltage (VDS ) The voltage drop across the MOSFET. 2. Drain Current (ID ) The current flowing through the MOSFET. 3. Power Dissipation (PDISS ) The power dissipated as heat in the MOSFET. Power Dissipation Formula When a MOSFET operates in the linear region: PDISS​ =V𝐷𝑆 ⋅ID ​ Why MOSFETs Heat Up in Linear Mode In linear mode: #The MOSFET is not fully turned ON, so there is a significant voltage drop across V𝐷𝑆. #Both the voltage drop and the current contribute to power dissipation. Current Regulation in Linear Mode *For current regulation, the MOSFET's gate voltage (V𝐺𝑆 ) is adjusted so that it sets the desired I𝐷. ​*However, the resistance between the drain and source (R𝐷𝑆(𝑜𝑛) ) and the operating voltage significantly affect the heat generated. _____________________________________________________________________ Example Calculation # Given: * V𝐷𝑆=5 V * I𝐷 = 2 A # Power Dissipation: * P𝐷𝐼𝑆𝑆=V𝐷𝑆⋅I𝐷=5 V⋅2 A=10 W This 10 W will be dissipated as heat, so proper heat sinking or cooling is crucial. ___________________________________________________________________ Tips for Using MOSFETs as Load Devices 1. Choose a High-Power MOSFET Select a MOSFET with a high P𝑚𝑎𝑥 rating and low R𝐷𝑆(𝑜𝑛). ​2. Use Heat Sinks or Cooling To manage heat dissipation effectively. 3. Consider a Linear Power Dissipation Model Use active cooling or a higher-wattage MOSFET if the heat exceeds manageable levels. 4.Design for Power Dissipation Ensure that V𝐷𝑆 and I𝐷 are within the safe operating area (SOA) of the MOSFET. ___________________________________________________________________ If heat is too excessive, you may want to explore switching mode circuits (PWM with a capacitor filter) to achieve current regulation more efficiently. These are much more thermally efficient than using the MOSFET in linear mode.

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