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Asking for the TPS2541 CDP setting for ILIM

Other Parts Discussed in Thread: TPS2541


Hi Team,
Customer would like to check the following condition for CDP mode.
  CTRL1 CTRL2 CTRL3 ILIM_SEL

 

CTRL1

CTRL2

CTRL3

ILIM_SEL

Standby

H

H

H

L

Normal

H

H

H

H


If customer switching the ILIM_SEL, can the 5V VBUS support without voltage drop for this?


Thanks,
Scott

  • Hi Scott,
    Your customers is right, setting CTR1,2,3, =1 puts the TPS2541 device in CDP mode, as for ILIM_SEL setting, your customer needs to ensure that whether ILIM_SEL is set H or L, the device must support 1.5A min current on VBUS with CDP mode. Lastly, could you please explain your last statement, I didn't catch what you are trying to say!
    Best,
    Haidar
  • Hi Haidar,

    Thanks for help.

    Here are the questions.

    If the ILIM_SEL change from H to L, will the VBUS go back to zero and recover to 5V?

    If the ILIM_SEL change from L to H, will the VBUS go back to zero and recover to 5V?

    Customer does not want the voltage go to zero and back to 5V behavior. They want to always keep 5V whiling the ILIM_SEL switching.

    Thanks,

    SHH

  • Hi Scott,

    Thank you for clarifying the question, so power switch turns off (VBUS =0) then turns back on (VBUS = 5V) happens during discharge function.  discharge function is triggered during device transition to or from (CDP or SDP modes), so your customer needs to make sure to stay in CDP (no change in any of CTRx pins) while ILIM_SEL pins transition to escape going to discharge mode. 

    BR,

    Haidar

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