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TLC6C5712-Q1: Circuit design

Nicolas Gabriel Rios Taurasi
Prodigy 205 points
Part Number: TLC6C5712-Q1

Hi team,

I'm working on a schematic circuit design with the TLC6C5712-Q1 and LW T6SH.CB-CZEY-FK0PM0-Z664-50-R18-Z leds (If=50mA @ Vf=2,9V). If I power up the leds with a 5V source, can I connect the leds directly to the output? Because the output voltage will be 0,75V. If I didn't connect any resistor the circuit would be work in a security operating condition?

In another hand, If I want to connect the same leds but with a greather current (for example: 70mA).. should I do the same connection? Without any resistor? My idea is to change the brightness changing the current with the Dot Correction feature.

  • 0
    TI__Expert 8590 points

    Hi Nicolas,

    1) Yes, the Leds can be directly connected to the OUTPUT. what do you mean "the output voltage will be 0.75V"?

    the output voltage is recommended to be between 0.5V~7V according to the datasheet.

    2) Yes, you can set different output current by PWM dimming or dot correction feature, but in this situation, the Global Current Reference(7.3.4.1) should follow the change of the Max output current.

    BR,

    Hailee.

  • 0 in reply to Hailee Xu
    Prodigy 205 points

    Hi Hailee thanks for your answer,

    This is what datasheet refers for:

    I guess that the voltage will be regulated by the current consumption, isn't it?

  • +1 in reply to Nicolas Gabriel Rios Taurasi
    TI__Expert 8590 points

    Hi Nicolas,

    Since the device is a constant-current-sink device, the change of Vo or LED load won't impact the output current in the normal operation condition.

    0.75V is the max dropout voltage for output current-50mA per channel.

    It is recommended to keep Vo higher than 0.75V if you want to set output current is 50mA.

    BR,

    Hailee.