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TPS2546: Power management forum

weiling xi
Prodigy 10 points
Part Number: TPS2546


Chip: TPS2546 has been designed for the BC1.2  charging function for the USB port.

Symptom: When Phone has been plugged into USB port, 5V_USB power rail from TPS2546  has been switched off last for 2 seconds then switched .

so , we want to confirm with TI whether or not this symptom of switching off for 2 s then on  is normal or not.

  • 0
    TI__Genius 12700 points

    Hi Weiling,

    I have assigned this issue to the relevant expert who will get back to you shortly.

    Thank you,

    Hari

  • 0 in reply to Hari Patel1
    TI__Mastermind 30000 points

    Hello,

    Yes this is expected behavior if you have the TPS2546 in DCP_Auto mode. More information about DCP_Auto mode can be found in 8.4.1. Here is an excerpt from that section that explains why VBUS drops whil in DCP_Auto

    • As mentioned above the TPS2546 integrates an auto-detect state machine that supports all the above DCP charging schemes. It starts in Divider1 scheme, however if a BC1.2 or YD/T 1591-2009 compliant device is attached, the TPS2546 responds by discharging OUT, turning back on the power switch and operating in 1.2 V mode briefly and then moving to BC1.2 DCP mode. It then stays in that mode until the device releases the data line, in which case it goes back to Divider1 scheme. When a Divider1 compliant device is attached the TPS2546 stays in Divider1 state