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Inquiry regarding inrush current protection on TPS2041B

Atsushi Okui
Genius 4015 points
Other Parts Discussed in Thread: TPS2041B

Hello, all

Now we have one inquiry regarding inrush current protection on TPS2041B from our customer.

Please refer to the item below, and feedback us with your comment.

When referring Figure 10 on datasheet page 12, this device seems to have 1A inrush current protection. 

However, our concerning on this device is whether this inrush current limit is compliant with USB2.0 standard.

We could only find out the description regarding inrush current limit on page 7 of the document below;

http://www.usb.org/developers/whitepapers/power_delivery_motherboards.pdf

Based on this information, we would like to clarify whether;

1. the inrush could be exceed 100us.

2. we should select other part which supports 2A or 2.5A inrush current limit.

We thank you in advance for your information.

Best regards,

  • 0
    TI__Mastermind 42795 points

    According to figure 10 in the TPS2041B datasheet the inrush time depends on the amount of output capacitance.

  • 0 in reply to Eric Wright
    Genius 4015 points

    Hello, thank you for your prompt reply.

    Actually, our customer is designing USB Device side. They are aiming for protecting USB Host side against abnormal sinking current caused by inrush current.

    In accordance with Figure 7-48 on "Universal Serial Bus Specification Revision 2.0", The rising edge of the current spike must be no more than 100 mA/μs.

    Does this mean that (inrush current(A)/inrush time(s) < 100k)?

    For your reference their inrush situation is inrush current=800mA and inrush time=500us, based on output capacitance=120uF.

    We thank you once again for your confirmation.

    Best regards,