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UC3825: UC3825DWTRG4 max voltage rating in each PIN OUT

Red Yen
Expert 4310 points
Part Number: UC3825

Hi Support team 

May I have your help to check the ABSOLUTE MAXIMUM voltage RATINGS which was NOT define in D/S 

PIN5 RT

PIN6 CT

PIN11 VOUTA

PIN12 PWR_GND

PIN14  VOUTB

PIN16 VREF5.1

thanks a lot 

  • 0
    TI__Genius 9140 points

    Hi Red:

    thanks for your interest on this part.

    I have deliver the post to Jaden, he will help on this post.

    BR

    Wenbin Huang

  • 0 in reply to David Huang33
    TI__Expert 7080 points

    Hi Red,VREF

    All of the undefined maximum voltage pins are "internal" pin which are not connected to "external" circuits. such as RT/CT/VREF.

    Even for OUTA/OUTB which connected to Mosfet gate pin , It absolutely can support > Mosfet gate pin allowed voltage such as +20V.

    and there are schottkey diodes parallel in these pins in datasheet , so don't worry about the negative voltage just follow the reference design.

    Hope this can answer your question.

    Thanks.

  • 0 in reply to Jaden Ning
    TI__Expert 7080 points

    Hi Red,

    Correct my description about OUTA/OUTB in last reply , usually , the driver pin power supply is controller's VDD , So the maximum allowed voltage for this pin is a little higher VDD allowed voltage.  you can find in datasheet block diagram , OUTA/B are supplied by VC. Maximum allowed voltage for VC is 30V.

    Thanks.