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UCC21750: Single ended PWM input

Weichi Zhang
Prodigy 40 points
Part Number: UCC21750

Hi,

I am aware that the UCC21750 can process both differential PWM pair and single-ended PWM, however, my questions are:

When the single-ended PWM is applied, does the IN- need to be connected to GND? 

When the differential PWM pairs are applied, the maximum IN+ and IN- applied is also VCC (5V)?

Many thanks

Weichi

  • 0
    TI__Guru**** 189401 points

    Hi, Weichi,

    Thanks for your interest in our products!

    Please read this section in the data sheet for the answer to your first question: 9.2.2.1 Input filters for IN+, IN- and RST/EN

    For your second question, this is addressed in the recommended operating conditions table in the data sheet:

    So, in single-ended input mode, you can ground the IN- pin and drive the IN+ pin up to whatever voltage you have applied to VCC.

    If this answered your question, please press the Green button. Otherwise, let us know what other questions you have.