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Does the TPS64202 current limiter work in 100% Duty Cycle Mode, please?

Thierry Legros
Prodigy 70 points
Other Parts Discussed in Thread: TPS64202, TPS64203

As it is not described in the datasheet, I'm looking for informations about the TPS64202 (or TPS64203) current limiter.

Does it work when the device is in 100% Duty Cycle Mode?

Is the transition between normal operation and 100% Duty Cycle seamless?


Have a Nice Day.

Thierry Legros

  • 0
    TI__Prodigy 210 points

    The TPS64202 has a working current limit even if it operates in the 100% duty cycle mode. As the load resistance drops, the controller reduces the duty cycle to limit the output current to the programmed level. See the scope shot:

    Here is the TPS64202 EVM being tested. Vout was set to 3.3V, but the controller was operating in dropout mode, because the supply voltage was lower. The circuit works here like a constant current source and the transition is seamless.

    The TPS64202 is a quite old chip. Nowadays most designs use converters instead of controllers. (The former has integrated power MOSFETs.)

    What is your application, your available Vin, and required Vout, Iout?

  • 0 in reply to Zoé Pál Bőle
    Prodigy 70 points

    Thanks for your answer.

    My application is very special.

    It's a preregulator Vin from 7 to 300V !

    But we need only 0.1A, that impose us a fairly big Inductor 2.2mH.

    TPS642002 is old but not as 2N2222, or 555 or many other devices.

    Oldies, but Goldies :-)