• ### LT3476 VREF connection

Good day,

Just one simple Q about LT3476 VREF pin, can i connect it to a digital potentiometer directly for dimming tuning instead of resistor string? Thank you so much.

• ### PWM Maximum frequency of LT3476?

Hi,

In my application, I need a high PWM frquency.

So what's the max. PWM frquency for LT3476  or where can I find such information for other LED drivers.

Thanks.

• ### LT3476 current calculation from Rsense

Perhaps I missed it on the datasheet, but how exactly do you calculate the current to the LED from adjusting the value of Rsense? I do not see an equation. I assume that Rsense just sets the max/full scale current and making it smaller increases the max…

• ### LT3476 limit cycle

In my experiment with LT3476 for LED dimming, I saw a phenomenon that seems like a limit cycle. I need some help to explain this. For my circuit employing the LT3476, I used 21K for Rt resistor, that means the switching frequency is 1[MHz], and used 20…

• ### Is the LT3476 LED appropriate for a color sequential application?

HUD's and other applications often use color sequential operation, that is, sequentially switching the R, G, and B LED's in a R>G>B>R>G>B pattern at rates up to 960 Hz.  This means the on times for each LED can be as short as 1 millisecond…

• ### RE: About　LT3476　 for　 improve the onset of pulse-skipping behavior

Thank you for your post.

Don't make the capacitor from SW to VC too large (I call the capacitor Cblank but that may not be the best name).

As mentioned in the datasheet excerpt you show above, the capacitor from SW to VC should be around 1000 times…

• ### RE: LT3476EUHF

Thank you for the post.  LED driver controllers similar to the LT3476 were not designed to PWM dim the LED brightness at repeat rates that are lower than around 100Hz.  If the repeat rate is lower than 100Hz, your eyes will see the blinking of the LEDs…

• ### RE: LT3476EUHF led-driver does not proper work

The LT3476 can perform PWM dimming of the LED brightness but the LT3476 may not be able to achieve a "camera flash" as you mention.  To achieve PWM dimming of LED brightness, the LT3476 essentially turns the LED on and off repeatedly with a repetition…