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silvio2402, 2 years ago (edited 2 years ago) to askelectronics in Can I switch this constant current LED driver at 38kHz?

Hey, thanks for your comment. I looked at using a resistor in series with the LED, but if my calculations were correct I could only power the LED less than 3W and 2W would be wasted.

R = (Vs-Vf)/If = (5V-2.8V)/1A = 2.2Ω

PLED = VfIf = 2.8V1A = 2.8W

PResistor = VsIf-PLED = 5V1A-2.8W = 2.2W

Let me know if the calculations are correct.

Edit: Calculations

silvio2402, 2 years ago to askelectronics in Can I switch this constant current LED driver at 38kHz?

Hey, thanks for your comment. I’ll look into the MAX16834 as soon as I have time tomorrow. Also, how would I be able to use a constant current driver with shunt dimming? How would I go about calculating the time a constant current source takes to recover from a short?