Hi,
I'm planning to controll (PWM for dimming & ON/OFF) a set of LEDs using a MOSFET with a micro-controller connected to the gate. The LEDs need a current of 0.7A and have a V-drop of 3.15V. I'll be using 20 of them.
My question is: which power supply do I need. Do I need to worry about PWM having an affect on the stability of the PSU output? Do I need a good quality PSU would a cheap AC/DC converter do the job?
I'd like to discuss the above question for both scenarions:
A) Using constant-voltge PSU with current limiting resistors in a certain array configuration
B) Or driving the LEDs directly using a constant-current power supply.
Thanks for any advice.
I'm planning to controll (PWM for dimming & ON/OFF) a set of LEDs using a MOSFET with a micro-controller connected to the gate. The LEDs need a current of 0.7A and have a V-drop of 3.15V. I'll be using 20 of them.
My question is: which power supply do I need. Do I need to worry about PWM having an affect on the stability of the PSU output? Do I need a good quality PSU would a cheap AC/DC converter do the job?
I'd like to discuss the above question for both scenarions:
A) Using constant-voltge PSU with current limiting resistors in a certain array configuration
B) Or driving the LEDs directly using a constant-current power supply.
Thanks for any advice.