Electronic – LED Driver Pin function

boostcurrentledled-drivervoltage

I have this LED Driver – A80604

I need to generate 30V for my LED Driver String for generating 300mA.

In a previous question, I received an answer that I need to fix the current using the LED Driver to 300mA and the output voltage will take care of itself.

My question 1 – So, in that case, I want to understand whether this is a synchronous boost LED Driver circuit ? I am asking because what should I connect to the GATE and GDRV pins to?

My question 2 – What would be the voltage at the pins LED1-LED4 ? Would there be 0V after all the forward voltages of the LED or would there be some residual voltage after the forward voltages of the LEDs?

Best Answer

My question 1 - So, in that case, I want to understand whether this is a synchronous boot LED Driver circuit ?

If you mean "boost" and not "boot" then no, it's not a synchronous boost circuit because it uses a standard diode here: -

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I am asking because what should I connect to the GATE and GDRV pins to?

You connect GDRV as per the above circuit. The gate pin needn't be used if you don't need the optional circuit shown above.

My question 2 - What would be the voltage at the pins LED1-LED4 ?

It depends entirely on the dimming levels you have set on ADIM (pin 9) AND the natural forward volt drops of the strings of LEDs. Hard to be precise of course because this circuit controls current into the LED strings and, without a detailed LED spec it's guesswork.

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