AN1288: Si828x External Enhancement Circuits
For larger systems that require very large or multiple parallel switching devices and for systems (such as SiC FET) that operate at a high switching speed, additional circuits comprised of low-cost external components can extend the Si828x capabilities many ways. For example, it is possible to increase the effective output current to drive larger SiC FET/IGBT modules or to adapt the Si828x to drive and protect higher switching speed SiC FET devices.
This application note discusses circuit enhancements and their associated performance improvements, including a current drive booster which will increase gate current drive above 20 A, circuitry for reducing DESAT protection response time below 1 μs while maintaining robust noise immunity, a DESAT threshold adjustment which enables a threshold below the nominal 7 V, a method of adjusting the soft shutdown time in the event of a fault, and an external enhancement of the internal Miller clamp, improving the suppression of the Miller spike which can occur when the external transistor is turned off.
●KEY FEATURES:
■Current drive above 20 A
■DESAT protection response time < 1 μs
■DESAT threshold adjustment
■Adjustable soft shutdown current to minimize VDS voltage spikes or to minimize shutoff time
■External Miller clamp
The Si828x family (Si8281/82/83/84/85/86) is made up of isolated, high-current gate drivers with integrated system safety and feedbackfunctions. These devices are ideal for driving power SiC FETs and IGBTs used in a wide variety of inverter and motor control applica-tions. A dedicated DSAT pin detects the desaturation condition and immediately shuts down the driver in a controlled manner. The Si828x devices also integrate a Miller clamp and negative VSSB to secure the power switch in the off state.
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Si828x 、 Si8281 、 Si8282 、 Si8283 、 Si8284 、 Si8285 、 Si8286 |
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External Enhancement Circuits 、 isolated gate drivers 、 DE-SAT protection circuit 、 gate drive circuit |
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Application note & Design Guide |
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Please see the document for details |
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SOT223;SOT669;LFPAK56;DPAK;SOT89 |
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English Chinese Chinese and English Japanese |
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2021/01/21 |
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Rev. 0.1 |
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AN1288 |
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1.5 MB |
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