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TPS2546 detection issue

Kai Hsiao
Guru 12675 points
Other Parts Discussed in Thread: TPS2546

Dear SIr 

We test IPad pro and test result as below 

Figure1 : CTL1 have jump to low => DCP_Auto => charge current can up to 1.7A

Figure2 : CTL2 have jump to low => DCP_Divider1 => charge current only 1A

May I know what's different between DCP_Auto and DCP_Divider1??

Why DCP_Divider1 only support 1A??

Thanks

  • 0
    TI__Expert 4065 points
    Hi Kia,
    So for your first question, the difference between DCP_auto and DCP_Divider1 is that in Divide1 mode, the device is in forced state and will stay in this mode, while in auto, the device can switch between different modes (divider1, divider2, and 1.2V modes) depending on the device attached to it.
    As for current limits, in both Auto or Divier1 modes, the device's current limit is set by RILIM resistors you selected for your application. I can see from the photos you provided you still have the R2 = 16.9k ohms, R3 = 80.6k ohms from the EVM setting right? , if that's the case, then your current limit is at 2970 mA (typ).

    Best,
    Haidar
    Please consider checking the "Verify Answer" button if I've answered your question.
  • 0 in reply to Haidar Hamoo
    TI__Intellectual 2685 points
    Hi Kia,

    DCP_Divider1 mode is Apple 5W charging mode, if you configure TPS2546 in dvivider1 mode, Apple devices will only draw 1A current.
    DCP_Auto mode can switch between Apple 5W and Apple 10W mode depending on the device attached to it. That's why iPAD Pro can be charged with 1.7A in DCP_Auto mode but 1A in DCP_Divider1 mode.