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Original question:

TPS92691

TPS92691-Q1: How to calculate the 15:1 analog dimming contrast ratio in TPS92691-Q1?

Ted Zhang
Intellectual 2280 points
Part Number: TPS92691-Q1

Hi,

What does this 15:1 analog dimming ratio mean and how this 15:1 analog dimming ratio come out? from below picture the linear range is from 0.14V-2.42V.  Thanks.

  • 0
    TI__Mastermind 18890 points
    Hi Ted,

    VIADJ can be clamped internally to 2.27V (page 6 of the specification) and the minimum that VIAJ for brightness change is 140mV. The ratio of this is about 16:1 but there can be offset and error in the current sense loop so we can only guarantee 15:1 dimming with analog control dimming into VIADJ. VIADJ directly control the current to the LED thus directly control the brightness of the LED.

    Thanks Tuan