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20 kwi 2022 · This is followed by a description of a basic MOSFET structure with emphasis on the gate to illustrate how the physical structure of the device determines the gate drive requirements. This application note discusses silicon MOSFETs; IGBTs and wide-bandgap (WBG) devices are not covered.
Today, millions of MOSFET transistors are integrated in modern electronic components, from microprocessors, through “discrete” power transistors. The focus of this topic is the gate drive requirements of the power MOSFET in various switch mode power conversion applications. MOSFET Technology.
As mentioned above, the switching waveforms of Power MOSFETs and IGBTs can easily be slowed by adjusting the value of the gate resistor. This feature can be used as an EMI reducer in applications where the mains phase angle is switched (figure 13), for example light dimmer circuits. Conventional dimming circuits are controlled by TRIACs.
In Figure 2, a long switching interval is observed when a power MOSFET is driven by a microcontroller I/O pin at its maximum rated source current. As seen in Figure 3, transition time reduces significantly with an ADuM4121 isolated gate driver, which provides much higher drive current than a microcontroller I/O pin, drives the same power MOSFET.
Single ±9 A Peak Gate Drivers suitable for high current 6 A, 9 A, and 12 A drive applications. 4 V to 15 V supply operation. 8-pin SOIC, PDIP, and PowerPAD MSOP packages. Industry standard pinout plus Enable function for improved driver control. UCC37323/4/5 and UCC27423/4/5.
This paper develops a switching model for Power MOSFET devices and relates the individual parameters to construction techniques. From this model, ideal drive characteristics are defined and practical IC implementations are discussed. Specific applications to switch-mode power systems involving both direct and transformer coupled drive are ...
SiC MOSFETs serve as the primary switching devices in a wide range of switching power supplies, controlled by applying a constant gate-source voltage. To ensure optimal performance with low conduction and switching losses as well as reduced electromagnetic interference (EMI), it's crucial to design an effective gate drive circuit.
