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PMP41115: OTG Mode, 5V/3A Output, Issue

Hardy Lin
Prodigy 50 points
Part Number: PMP41115
Other Parts Discussed in Thread: TPS26750

Tool/software:

Hello,

I am currently reviewing the TIDT407 document (Test Report: PMP41115 240W USB Type-C® and USB PD 3.1 Charger Reference Design), and I have two questions that I’d appreciate your feedback on:

  1. According to the TPS26750 datasheet, the PP5V pin should be supplied externally with 5V/3A to enable OTG mode operation at 15W (5V/3A). However, the PMP41115 reference design uses an LDO (TPS7A2450) with a maximum output current of only 0.2A, which does not meet the 3.6A recommendation from the datasheet. How does PMP41115 achieve 15W OTG mode output (5V/3A) under this architecture?

  2. On page 14 of TIDT407, Figure 3-8 is labeled as “5V/3A Output, Start-Up Waveform”, but the waveform shown appears to be from Figure 3-9, which is “OTG Mode, 50.4Vbat, 9V/3A Output, Start-Up Waveform”. Has there been an updated version of the document with the correct 5V/3A output startup waveform?

Thank you in advance for your support.

  • 0
    TI__Intellectual 2030 points

    Hi, TPS26750 has solved this issue to eliminate external 5V/3A source, so it can directly leverage the existing power stage to deliver 5V3A source.

    for the test waveform image, it just show the different output voltage while starting from 5V, then go to 9V,15V,20V,  so on so forth, if you want to see the 5V/3A condition, maybe you can check Fig-3-17, during the start up, there is a 5V/3A OTG mode condition for your reference.

    BR

    Max