Anyway to get 12v out of the Dimming Expansion Module?

Expansion modules and attachments
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AlanM
Posts: 263
Joined: Wed Jan 01, 2014 7:26 am

Re: Anyway to get 12v out of the Dimming Expansion Module?

Post by AlanM »

The Meanwell LDDs, like Colin posted, always put out the rated current, and they basically turn it on and off quickly based upon the PWM signal you're sending it. So if you have a 1000mA LDD it will put out 1000mA at a voltage up to a volt or two below whatever you're supplying it with. Then the PWM signal makes it go on and off with a 10% duty cycle if you're sending it a PWM signal that is 5V 10% of the time..

You don't have to match it carefully to the drop of the LEDs on the output like you used to have to do with other driver technology. The LDD seems to float the DC- output up to whatever level results in a 1000mA output and just leaves it there.

If you have a potentiometer dimming 10A and 12V, that would be a ton of heat dissipated. That's normally not how you dim an LED, with a resistor/potentiometer, you dim it by regulating the amount of current being supplied by the power supply in some way.
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