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constant-current or constant-resistance, which mode is right on current limiter test ?

CHANYOUNG PARK
Prodigy 20 points

HI everyone,

I tested current limiter TPS25924x under below conditon:

IC max current setting --> 2A.

electro load setting -->> CC mode (constant-current)

I want to maintain 2A output from IC even if load pulls over 2A. but IC shut down immediately.

so I found user's guide "TPS25923-41EVM : Evealuation Module for TPS259230/41" downloading from ti.com

there is comment(note) that output load is set to constant-resistance mode and not constant-current mode.

I changed load mode to CR. so I got output current disconnected.

now I am very confused which mode is right when I test devices

What is the difference betwen CR and CC mode?

thank you

chanyoung park

  • 0
    TI__Guru** 102811 points
    Hi Chanyoung,

    When the device TPS25924x reaches current limit (2A in your case), the device acts as a current source. If an electronic load is used for testing in CC mode, which turns out to be placing two current sources in series in the network. This pulls down the output voltage and eventually IC thermal shutdown.
    Are you experiencing any problem in CR mode?

    Best Regards,
    Rakesh
  • 0 in reply to Rakesh
    Prodigy 20 points

    Hi Rakesh

    Thank you for your answer.
    There is no problem in CR mode.
    but, I usually test adapter(charger) in CC mode because verify maxium current.
    Adapter has to maintain its voltage in using maxium current.
    If adapter powers?5V/2A writing in its body, ?load has to?pull?maxium current 2A at 5V?
    in this time,??Are there 2 current sources in series?

    Best Regards,
    Chanyoung Park

  • 0 in reply to CHANYOUNG PARK
    TI__Guru** 102811 points
    Hi Chanyoung,

    Power adapter, LED driver may differ in behavior as they have both Voltage and current control loops in the closed loop system.

    Regards,
    Rakesh