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TPS7H4010-SEP: TPS7H4010MRNPTSEP

Roi Kobo
Intellectual 680 points
Part Number: TPS7H4010-SEP

Tool/software:

Hello

I want to use TPS7H4010MRNPTSEP, I have a 2 questions:

1. what happend when overvoltage will acuure at VIN ?

2. My Vout is 1V, TI recommends tying to VOUT when 3.3 V ≤ VOUT ≤ 18 V

 ->   What happend If I connect the bias to SW ?

 ->   What is your recommendation? 

->    How does this affect efficiency?

3. Regarding the Overcurrent protection, Can I limit the part to 4.5A?

Roi

  • 0
    TI__Expert 5061 points

    Hello Roi,

    If the voltage at PVIN exceeds the absolute maximum voltage of 36V, the device may be may permanently damaged.

    The Bias pin should only be connected to a DC voltage source, so the SW node is not a viable candidate. Additionally, if VIN is  greater than 20V and Bias were connected to SW, the device may be permanently damaged. If your VOUT is 1V, then Bias should be connected to GND, or to another DC voltage source that is less than the VIN being used for the TPS7H4010-SEP but greater than or equal to 3.3V. Maximum efficiency gains from the Bias pin can be seen when VIN is high, and Bias is connected to a 3.3V source.

    Figure 7-6 on page 19 of the device datasheet compares the efficiency of using Bias or connecting to GND (unused)

    Thanks,

    Andy

  • 0 in reply to Andy Fondaw
    Intellectual 680 points

    Hello Andy

    What happend to the device the Bias connected to voltage less than 3.3V?

    Can i connect the Bias to VCC?

    Roi

  • 0 in reply to Roi Kobo
    TI__Expert 5061 points

    Hi Roi,

    The reason why Bias must be connected to a voltage greater than 3.3V is because it is an optional external supply for VCC. Efficiency is gained by not regulating VCC down from whatever large VIN is being used, but rather a voltage closer to the target VCC voltage (3.27V or 3.1V depending on the mode) so voltages lower than 3.3V will not provide enough headroom for proper VCC regulation.

    This also answers your question about powering Bias using VCC. Since Bias is the input supply for VCC, this will not work.

    Thanks,

    Andy

  • 0 in reply to Andy Fondaw
    Intellectual 680 points

    The Bias pin can be floating?

    Roi

  • 0 in reply to Roi Kobo
    TI__Expert 5061 points

    Hello Roi,

    Bias should be tied to GND when not in use.

    Thanks,

    Andy