Michael_N
Member level 2
Hi all,
I'm building a circuit, wich I can't quite figure out, so any suggestions will be appreciated
The circuit shall act as a constant current source for 3pcs Luxeon rebel leds (driven at 500mA as total for the 3, 166mA each)
I need to be able to control the current downwards, by a analog voltage. Other solutions is ok.
The leds will be blinking by the way.
The power source is 2 6V batteries, 50Ah
It is very important that the circuit is as efficient as possible.
I have experimented a little with a LM2575 adj with a current limiter at the Feedback pin. And a 555 timer switcing a Fet on and off to make the leds blink. The Fet was connected to the current limited output..
But can this be done better?
Kind regards
Michael
I'm building a circuit, wich I can't quite figure out, so any suggestions will be appreciated
The circuit shall act as a constant current source for 3pcs Luxeon rebel leds (driven at 500mA as total for the 3, 166mA each)
I need to be able to control the current downwards, by a analog voltage. Other solutions is ok.
The leds will be blinking by the way.
The power source is 2 6V batteries, 50Ah
It is very important that the circuit is as efficient as possible.
I have experimented a little with a LM2575 adj with a current limiter at the Feedback pin. And a 555 timer switcing a Fet on and off to make the leds blink. The Fet was connected to the current limited output..
But can this be done better?
Kind regards
Michael