I would like to use the TPS62200 sync buck regulator as a low current LED (the LED only consume 4v@20mA from a 6V battery source) driver in a current feedback form.
My question is as follow :
1. Can the TPS62200 be used as a led driver?
2. Can I dim the LED by PWM modulating the EN input?
3. Would this type of design considered efficient design?
4. What is the efficiency of this type of circuit and how to calculate it?