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5 months ago in Applied Physics By Vinod D

Why does my gate pulse amplitude drop when i connect to an igbt module?

My gate driver output looks perfect into a no-load. But when I connect it to the IGBT module, the pulse amplitude drops. What's happening?

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By Neethi Answered 5 months ago

Classic sign of insufficient gate drive current. The IGBT's input capacitance (Cies) is huge—it needs a strong current pulse to charge quickly. If your driver can't source enough peak current, the voltage droops as it struggles to fill that capacitor. Check your driver's peak current capability (2A, 5A, 9A?) and ensure low-inductance connections between driver and gate pin. Long, thin traces = inductance + ringing + droop.

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