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Survey TPS65131-Q, spec problem

Kuo Duke
Expert 2040 points
Other Parts Discussed in Thread: TPS65131, TPS65130

Hi All,


I need survey TPS65131 application in LCD product, but this description is confuse me.
as below
TPS65131: 1950-mA switch current limit, both rails.......   
TPS65130: 800-mA switch current limit, both rails.......  
positive output voltage up to 15 V and a negative output voltage down to –15 V with output currents in a 200-mA range in typical applications

Why 1950mA switch current just push output current 200mA for positive and negative source.
Does it with output electric potential & efficiency & input voltage have relation?



  • 0
    TI__Expert 8010 points
    Hello Kuo Duke,

    Thanks for your enquiry. The description on the front page which you are referring to is only intended to give a rough overview of the classification of this devices. The maximum output current is strongly dependent of the input and the output voltage, please refer to figure 1 to 4 to find the maximum output current for specified configuration.
    If you want to know what drain and switch current to expect depending on the configuration I can recommend you to download and use the Power Stage Designer Tool (www.ti.com/.../powerstage-designer)
    If you want to understand the theory beyond these calculations I can recommend you the following application notes:
    Boost Stage: www.ti.com/.../slva061.pdf
    Inverting Buck-Boost Stage: www.ti.com/.../slyt286.pdf

    Thank you,
    Regards,
    Ilona