Would you please teach me about DRVH and DRVL output current of TPS51604?
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The sourcing and sink resistance of gate drive is available in spec table on datasheet page 4.
The sourcing and sink current can be calculated as (VDD-Vgate)/Rgate
For example, the typical sourcing resistance of DRVL is 1.5ohm, the VDD voltage is 5V, the initial gate voltage is 0V. Then the initial sourcing current is (5V-0V)/1.5ohm=3.33A.
With gate voltage increases, the sourcing current decrease.