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UCC21750-Q1: How the 400mA STO is realized?

Jass Jin
Intellectual 870 points
Part Number: UCC21750-Q1
Other Parts Discussed in Thread: UCC21750

UCC21750 has 400mA soft turn-off current and in the block diagram, it has another drive path for STO function. How does this happen? Is it realized by a solid current source or just a mosfet with bigger resistor? If it's just a resistor and how is 400A calculated?

  • +1
    TI__Expert 3890 points

    Hi Jass, 

    The soft turn-off is realized by an internal current source. You can see the block diagram on figure 47 of the UCC21750 datasheet. 

    If this answers your question please let me know by pressing the green button. 

    Thanks, 

    Vivian