Common-mode Transient Immunity for Isolated Gate Drivers
Isolated gate drivers are widely used for driving insulated-gate bipolar transistors (IGBTs) and MOSFETs in various applications such as motor drives, solar inverters and automobiles. In addition to turning the IGBTs or MOSFETs on and off, these drivers provide galvanic isolation. The device’s switching rate depends on the application and type of the device being used. Common-mode transient immunity (CMTI) is an important parameter of a gate driver to consider when operating it at higher switching frequencies. This paper gives background on a general pulse-width modulation (PWM) scheme, the transition loss associated with high switching frequency, and isolated gate-driver solutions to reduce transition time.
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