I'm looking at the datasheet for LT3760 - 8-Channel × 100mA LED Driver. My goal is to build a Ring light for my DSLR camera to use in macro work as well as act as a indoor fill light solution. The chip has the capability of using PWM to carry the avg LED current and a Iset pin to set the Io. My thought was to simple use a fixed 5k resistor in series with a 25K vaariable resistor to attain the full current adjustability of the chip from 20mA - 100mA.
The question I have, and I'm pretty sure that it is the case with most LED, is that the LED lolor will change with the current suplied to it. If this is the case, then PWM would be the optimal method to obtain a consistent color from the LED's.
Can anyone back up my thought on this?
http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1094,P90321
The question I have, and I'm pretty sure that it is the case with most LED, is that the LED lolor will change with the current suplied to it. If this is the case, then PWM would be the optimal method to obtain a consistent color from the LED's.
Can anyone back up my thought on this?
http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1094,P90321