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sink, source current and drive current

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ervinzhou

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I read some datasheet of synchronous buck controllers. Most of them show the parameter: sink and source current(I know what they are).
Today I read the datasheet of TI TPS51117, it has another parameter: drive current and gives an equation: Ig = Qg x Fsw (Qg is charge needed to charge gate capacitance and Fsw is the switching frequency)
What is the difference between source, sink current and drive current?
 
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