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TLC5952/51/47 Power Efficiency

Newton
Expert 1125 points
Other Parts Discussed in Thread: TLC5951, TLC5952, TLC5947

In terms of input power to output power, what is the efficiency of the following TI LED Drivers:

(i) TLC5951

(ii) TLC5952

(iii) TLC5947

 

  • 0
    TI__Guru 60235 points

    Hello Himansu,

    These parts are not power converters. The input power has to come from another power IC. The TLC5951, TLC5952 or TLC5947 just connect external LEDs to GND and regulate the current through the LEDs.

    The OUTx pins are current sinks that regulate the current. In the datasheets you can find a typical characteristics graph giving the output current over output voltage.

    Normally the majority of the power is dissipated in the external LEDs connected to the OUTx pins.

    So there is no easy input to output power relation as in a power convertion IC. The only possible efficiency you can calculate is the system efficiency meaning how much of the energy from the input of the used power conversion IC is generating light in the LEDs and how many is dissipated in the TLC59xx IC. This depends on the voltage you have on the anode of the LEDs, how many LEDs you have in a row and how much current is going into the LEDs and hence the output.

    Best regards,
    Brigitte