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UCC21530-Q1: Peak sink source current limit exceeded

ABKD
Intellectual 570 points

Part Number: UCC21530-Q1

For the gate driver UCC21530-Q1, the peak source current is 4A and sink current is 6A. I have below two queries.

1) If these current limits are exceeded due to external gate resistor and interna gate resistor values, then what can be the impact on gate driver? Will it damage the date driver?

This if referenced to calculations given on page 25, 26 of the datasheet.

2) If the driver outputs are shorted continuouly, i.e. OUTA to VSSA and OUTB to VSSB, exceeding the sink-source current limits, then what will happen? Will it damage the gate driver?

  • 0
    TI__Expert 4020 points

    Hi Abhishek, 

    1. Peak current limits are not limiting ratings which can be exceeded and cause damage, they are specifications of the peak current that the device is capable of providing. We have a FAQ which details how external gate resistors and internal resistances can be adjusted to limit the peak current[FAQ] UCC27614: Gate Driver Peak Current Considerations . The calculations which you reference estimate the peak current that will be provided, not the amount of current which should not be exceeded. 

    2. Yes, this will cause damage to the driver. This is not caused by an exceeding of peak current specs, but rather this action will damage the internal circuitry of the driver. 

    Best,

    Amy