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TPS92511 : tps92511 calculator and analog dimming.

Jay Jang1
Prodigy 10 points
Part Number: TPS92511

hi. Respected engineers.

1. tps92511 is not a calculator document? Required.

2. Is low brightness control related to inductor value when analog dimming?

  • 0
    TI__Expert 3885 points

    Hi Jay,

    This device works well under Continuous Conduction Mode (CCM), i.e. the current regulation will not be accurate if it runs in Discontinuous Conduction Mode (DCM). Therefore, inductor selection is key if you would like to do analog dimming.

    We do not have Excel calculator for this device. But the parametric calculations are easy (as you can find them all from the datasheet).

    Switching frequency (in kHz) = 10 x 10^6 / RFS (while RFS is the resistor connected between FS pin and ground).

    LED current (in A) = 1500 / RIADJ (while RIADJ is the resistor connected between IADJ and ground, max of 30 k-ohm).

    And as above mentioned, inductor selection is important to make sure your full range of LED current output are running in CCM.

    Thank you!