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TPS43060: Is there any problem if R19 in figure 34 on page 31 in TPS43060 datasheet (SLVSBP4D) is removed?

Kazuya Nakai59
Guru 21545 points
Part Number: TPS43060

 Hello guys,

 One of my customers is using TPS43060 for their products.

 The customer usage conditions:

 Vin=18V, Vout=24V, Io=1A max.

 They have the following questions. Could you please give my your reply?

 Q1. Is any problem happened when R19 (2 ohm) is not inserted (=0ohm)?

 Q2. Is any problem happened when Rcharge which described on page 17 and 18 in the datasheet is not inserted (=0ohm)?  

 Your reply would be appreciated.

 Best regards,

 Kazuya.

  • 0
    TI__Guru* 78150 points

    Hi Kazuya,

    Thank you for posting.   Regarding R19, I would recommend to reserve the position on your PCB if you just do your prototype. It helps slowing down the turn-on speed of the low side FET but not affecting its the turn-off speed for least efficiency impact.  The turn-on slowdown may be needed for EMI mitigation and reduced switching ringing.  If you use R10, it also slows down the turn-off and reduces the efficiency.  Only remove R19 in your final circuit after your testing of the prototype that your circuit can perform well without it.

    Rcharge helps limiting the surge current when charging the boot capacictor to prevent overcharge. Like R19, I would also recommend to first reserve its position on your prototype and you can remove it after verifying no problem when shorting it. 

    Thanks,

    Youhao Xi, Applications Engineering