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USB and Solar Charge Power Input Proetection ( Voltage and Polarity)

Alone173
Expert 1225 points
Other Parts Discussed in Thread: TPD4E1U06, TPD6S300

Hi everyone.
I have an issue about voltage and Polarity of USB+Solar power connector on USB Solar Charge project.

In my application, I use  5 pin connector for USB and Solar Power input. But in some case, have an occur when user connect wrong on those pin, such as: put power of solar charge to USB_DP/DN, or inverser btw GND and solar power,... so make circuit burn in those case.
I have just update the overvolatge for solar power small than 28V.
But in this case, if connect power to USB_DP/DN, maybe TVS diode can not protect when not have right VBUS.
Please help me to solve this issue.
Thanks

  • 0
    TI__Genius 12410 points
    Hello,
    Firstly I would say that if you have discrete ESD protection, the TPD4E1U06 is rated twice as high as the IP4220CZ6 for ESD and does the full level 4 IEC 61000-4-2 which is 8kV contact and 15kV air gap. Also it does not connect to VBus of the USB.
    However if you are worried about voltages up to 28V coming from the solar panel you will have to look at integrated parts with over voltage protection like the TPD3S714 which has overvoltage protection up to 18V.
    Otherwise you will have to look into TI’s eFuse’s but make sure that it can pass the USB 2.0 signal.

    Regards,
    Cameron
  • 0 in reply to Cameron Phillips
    Expert 1225 points

    Hi Cameron
    Thanks for your suggestion.
    Maybe TPD3S714 is most suitable in your options, but it have requirement must connect to VBUS with 4.5-5V, while my system dont have this voltage.
    So, can you tell me more if I choose Ti's Efuse.
    Thanks

  • 0 in reply to Alone173
    TI__Genius 12410 points
    Hello,
    I do not actually cover the efuse portfolio so I will try to put you in contact with them to see what they can do for the USB2.0.

    Regards,
    Cameron
  • 0 in reply to Cameron Phillips
    Expert 1225 points
    OK, thank you.
  • 0 in reply to Alone173
    TI__Genius 12410 points
    Hello,
    I spoke with the team and doing 28V DC OVP seems out of scope of TI's current portfolio. Like is said the 714 would work for up to 18V. Also if you wanted you could make it discretely using FET's and a couple of resistors as long as it had a low Rdson.
    Regards,
    Cameron
  • 0 in reply to Cameron Phillips
    Expert 1225 points
    Hi Cameron
    Thanks for your feedback.
    Can you tell me maximum voltage that TI's current portfolio have.
    Really TPD3S714 also have another issue when in my design need get power from VBUS of USB port to supply for IC charge.
    So, in this case, can you show me a example circuit for USB protection.
    Thanks
  • 0 in reply to Alone173
    TI__Genius 12410 points
    Hello,
    It depends on how fast your signal speed is. USB2.0 has several different speeds that will impact whether or not you can use different protections. If it is the 480Mbps then the best solution is the 714 which has 18V tolerance. We also have the TPD6S300 that the SBU lines should be able to pass USB2.0 and is up to 24V OVP. and does not attach to Vbus.

    Regards,
    Cameron
  • 0 in reply to Cameron Phillips
    Expert 1225 points
    Hi Cameron
    Thanks for your feedback.
    In this case, USB port is connected with FT234 ( for USB-RS232 converter ) so speed from 0.3-300Mbps.
    With 714, it's not suitable because i need vbus for IC charge.
    So, in this case, maybe better i should use 2 TPS26600PWPT IC for V_solar and Vbus, TPS26600PWPT for data-line of USB.
    Thannks.