I have been unsuccessfully for some time to make an led flood light. Through this forum I have however had so much useful advice and help I believe at long last I may be on the right path to making my flood light.
For outstanding information and advice please see my previous post (Sorry not sure how to put a link to it) on making and designing heat sinks.
I have purchased a LDD-600H 600mA LED driver. (Datasheet attached) I want to drive 3 x 3 Watt LED's (Datasheet attached) they are rated at 700mA But don't want to drive at there full forward current.
1. The driver datasheet shows no external components. However it has a warning about not connecting the input to the output. Whilst this may be an obvious statement is it possible to put a diode to protect the driver if this does happen. Would I need to put any other external components. The light is going to be run from a 12 Volt 66Ah battery, which when fully charged is 14.2 Volts.
2. Originally I had 3 LED's in series with an 11R 5 Watt resistor which worked but the LED's were Dim. When I put a 4R7 10 Watt LED in series, the heat sink got roasting hot The LED's were Bright but started to flash on and off, I could not understand why, I think the heat sink was small so put a fan blowing directly onto it and it still flashed.
What I basically need to understand is
1. Should I put the driver and if any needed other components onto the same PCB as the LED's.
2. Any other advice or things I need to Know will be greatly appreciated
Best wishes
Rodney
For outstanding information and advice please see my previous post (Sorry not sure how to put a link to it) on making and designing heat sinks.
I have purchased a LDD-600H 600mA LED driver. (Datasheet attached) I want to drive 3 x 3 Watt LED's (Datasheet attached) they are rated at 700mA But don't want to drive at there full forward current.
1. The driver datasheet shows no external components. However it has a warning about not connecting the input to the output. Whilst this may be an obvious statement is it possible to put a diode to protect the driver if this does happen. Would I need to put any other external components. The light is going to be run from a 12 Volt 66Ah battery, which when fully charged is 14.2 Volts.
2. Originally I had 3 LED's in series with an 11R 5 Watt resistor which worked but the LED's were Dim. When I put a 4R7 10 Watt LED in series, the heat sink got roasting hot The LED's were Bright but started to flash on and off, I could not understand why, I think the heat sink was small so put a fan blowing directly onto it and it still flashed.
What I basically need to understand is
1. Should I put the driver and if any needed other components onto the same PCB as the LED's.
2. Any other advice or things I need to Know will be greatly appreciated
Best wishes
Rodney
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