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TPS2595: TPS259541 is fail to power up at CC MODE,but ok for CR mode

Part Number: TPS2595

Hi Expert,

The engineer is testing the TPS259541.

The DC load machine Slew rate is 0.42V/mS and OCP setting is 2.84A of TPS259541.

With CR mode,it can power up to support the 2.4A needed .  

With CC mode,the output will be shutdown around 0.9A only.

pls advice how to fix this.   

Best regards,

Eric Lai

  

Field Application Engineer

Texas Instruments Taiwan Limited

O: +886-2-2175-2582

M: +886-909-262-582

E-Mail:Eric.Lai@ti.com    

  • Hi Eric Lai,

    Do not use electronic load in CC mode to apply load. Always use resistive loads to evaluate eFuse devices.

    • With resistive loads, the output operating point will be decided by the eFuse in current limit mode of operation. In case of active loads (e-load), the output voltage & current will be decided by both the e-load characteristics and eFuse characteristics in current limit mode. So, load current cannot be limited by the set current limit of the eFuse. You will observation different current than the current limit value.

     

    • Alternate explanation: When the eFuse device reaches current limit, 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. When the electronic CC load exceeds set current limit of eFuse device, the electronic load tries to pull down the output voltage and shifts the operating current other than the current limit value.

  • Hi Eric Lai,

    Hope your question is answered. In case you do not have any further questions, can we close this thread ?