I am using a constant current LED driver from Infineon - TLD2311 (datasheet)
This is a 3 channel driver with a maximum of 120mA (configured to give max) per channel driven with a 12V supply. The LED I'm using has forward current (If) of 120mA and forward voltage drop (Vf) of 3V. 3 of these are connected in series per channel to have a total of 9 LEDs.
So, are these following understanding correct:
- Each LED gets only about 40mA as there are 3 in series and max current per channel is 120mA
- The voltage the output channel will be about 9V. (Vf = 3.0 * 3Nos in series = 9V)
Now, if I add one more in series (as I want to increase the total brightness) to have 4 per channel then are these correct:
- Each LED will now be getting only about 30mA which actually dim each LED further.
- Since the supply voltage to the driver is 12V, having 4 LEDs in series will make the voltage drop across the LED to be 12V which is equal to the supply voltage and hence the IC won't be able to drive the LEDs at all.
Please share your inputs.