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led driver IC

user3738299
Prodigy 10 points

Other Parts Discussed in Thread: TPS92515, TPS92513

We want to find a LED driver IC. By adjusting Vadj and PWM, 64 different output currents (0-300 mA) can be generated. The output current of TPS92515, which we used before, is unstable (the input parameters of the same board are consistent at different times but the current is not consistent). According to your FAE recommendation, this chip needs fixed values due to inductance, sampling resistance, resistance and capacitance, etc. It is impossible to achieve that one inductance value and sampling resistance value can correspond to different output currents. So we want to find an alternative solution. Please give me some advice.

  • 0
    TI__Intellectual 2590 points

    TPS92515 is a quasi-hysteretic converter.  It can regulate current across a wide operating range, however, it's frequency will change and it's accuracy depends on many variables.  If you are looking at only 300mA maximum with adjustable output current, you might want to try the TPS92513.  It should accomodate your specifications and it is a fixed frequency device with a control loop.  It is also a small and fairly simple device to design with.

    -JP