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Analog dimming circuit for LM3421 LED driver?

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T

treez

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Hello,
Page 14 of the LM3421 LED driver IC datasheet gives a solution circuit for implementing analog dimming of the leds.

Unfortunately that circuit allows the analog dimming, but does not allow one to know exactly what dimming level one is dimming to (it just allows one to dim to more or less level)

Are the following circuits acceptable alternatives for analog dimming the LM3421?

LM3421 DATASHEET:
https://www.ti.com/lit/ds/symlink/lm3421.pdf
 

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  • current monitor DIMMER.pdf
    12.6 KB · Views: 166
  • opamp DIMMER.pdf
    7.5 KB · Views: 89

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