• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 40 subscribers
  • Views 219 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PMP8740: Input Type

Elisha Tarroza71
Expert 3700 points
Part Number: PMP8740

Hello,

PMP8740.4 (Output Voltage 4) in the parametrics section says that the input is DC. 
I was checking the user guide/test report, and it seems that it only takes in AC supply.

Can you please help confirm?

Thank you!

  • 0
    TI__Intellectual 2770 points

    Hello Elisha,

    PMP8740 is a 2kW offline charger for forklifters; input is universal offline, so 85Vac to 264Vac;
    the PFC CCM boost generates an intermediate voltage around 390Vdc out of upper AC input;
    the phase shifted full bridge PSFB converts this intermediate voltage to 27.6Vdc typical;
    due to various chemistries and battery conditions this voltage might vary in between 22Vdc to 29Vdc.

    The auxiliary flyback provides 12V to primary side and another 12V to secondary side;
    this flyback works via peak detection out of AC, means 120Vdc to 370Vdc.
    Out of this flyback another flybuck generates +/-5V, out of +5V the tiny LDO generates +3.45V to
    supply the uProc etc. That's basically the total power tree.

    CC/CV charging and control/monitoring is supported via uProc control.
    Several chargers could be placed in parallel to increase the output power;
    intercom between the chargers works via CAN bus i/f.

    A full design review is available here:
    www.ti.com/.../slup348.pdf

    Best regards, Bernd