I am making an LED tail light for my motorcycle.. I will be using an array of superfluxes (2.14-3.03 VF 70ma), that will PWM controled using a 555 timer.
My aim is highest effacy. My voltage ranges from 12.5 (off) 14.2 (running) 15(at high rpm).
The superflux array will consist of 72 superfluxes in an array of 4 * 18. A 3.3 ohm 2 watt resistor will be place right before the array to control current. I will have the PWM circut operating a transistor (not sure what kind to use) in the line to reduce voltage drop to the array.
I know if i use a LDO LM3812 i should be fine, will i be losing more vs if i used a resistor instead?
also do the LMxxx series go into direct drive if they drop out?
My aim is highest effacy. My voltage ranges from 12.5 (off) 14.2 (running) 15(at high rpm).
The superflux array will consist of 72 superfluxes in an array of 4 * 18. A 3.3 ohm 2 watt resistor will be place right before the array to control current. I will have the PWM circut operating a transistor (not sure what kind to use) in the line to reduce voltage drop to the array.
I know if i use a LDO LM3812 i should be fine, will i be losing more vs if i used a resistor instead?
also do the LMxxx series go into direct drive if they drop out?