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TPS2500 / TPS2505

Ran Feldman
Intellectual 780 points
Other Parts Discussed in Thread: TPS2500

Hello,

 

for the TPS2500/5 Let’s assume the following scenario:

-        USB OTG port functions as B-device (doesn’t source current);

however, no power is drawn from the USB bus

-        Boost converter is enabled and AUX output is used to power other devices on board

-        USB switches are disabled (ENUSB=0)

-        The USB port is connected to a host (A-device) which provides 5V on VBUS which is connected to USB pin of TPS2500

-        Voltage on USB pin is larger than AUX output: VUSB > VAUX

 

My questions are:

  1. Can      there be a reverse current flow from USB pin to AUX pin?
  2. What      if VUSB > VAUX x 1.05? Can it trigger the AUX      OVP?
  3. Is      there a minimum value for VOVP? Datasheet gives only a typical      value.

 

Thanks,

Ran

  • 0
    TI__Mastermind 42795 points

     

    My questions are:

    1. Can there be a reverse current flow from USB pin to AUX pin? Not when ENUSB=0
    2. What if VUSB > VAUX x 1.05? Can it trigger the AUX OVP? Not when ENUSB=0
    3. Is there a minimum value for VOVP? Datasheet gives only a typical value. Internal data for TPS2500 indicates ~ -3% for minimum VOVP.