Hi friends,
I am using ILD6150 LED driver to drive a high power LED.
The output current is designed to 400mA.
The maximum current rating of LED is 500mA and that of the driver is 1000mA.
The forward voltage of LED is a maximum of 3.5 V.
The input voltage range of the LED driver is 4.5V to 60V. But I have no idea about its output voltage.
Can anyone help me in finding this problem?

 

Hi shibin, the LED driver is a step down, so the output voltage has to be less than the input voltage. But it will self regulate what the voltage actually is until the LED is taking the correct current as programmed by the sense resistor.

 

@pmd34 thank you for your time.
But the datasheet has no information regarding the same.

 

If you set your LED runs at 3V @100mA..and you set the IC current sense to run at 100mA then the driver will supply 3V.. it will supply whatever voltage it needs to, to get enough current flowing through your LED/s.
To set the correct value of sense resistor you use this:

 

When you are designing LED lighting you choose the configuration of series and parallel groups of LEDs to accommodate a particular supply voltage and the constant current buck converter provides the correct current while the LEDs voltage drop determines the voltage.

Obviously, your supply needs to be enough for the LEDs you are powering and how they are connected. With a single LED, it's just whatever current you want to drive it with, and enough voltage to make that happen.

 

Hello,

Also the size of the inductor is important for a good design:



Also there is a minimum for Vs given in the table.

Bertus

 

@pmd34 thank you for your time.
But the datasheet has no information regarding the same.

See Pages 22 & 23 of the Datasheet
The chart shows you: Input Voltage vs Output Current vs Number of LED's
https://www.infineon.com/dgdl/Infin...n.pdf?fileId=db3a30433cabdd35013cb490a0006ca8