Meanwell LDD driver: for those who want to dim to 0 using Arduino

step down daisy chain

step down daisy chain

Is it good practice to daisy chain dc/dc step downs? Seems like heat would be less of an issue if you use a 48v to 12v step down and then ran a 12v to 5v step down off of the first step down instead of going with a 48v to 5v step down.
 
cbatterman said:
Is it good practice to daisy chain dc/dc step downs? Seems like heat would be less of an issue if you use a 48v to 12v step down and then ran a 12v to 5v step down off of the first step down instead of going with a 48v to 5v step down.
Click to expand...
2 types of DC/DC exists : linear and switching.
For linear step down, your statements is very true.
For switching , they are using a different design: so basically it is not a big deal to do 48 to 5 directly - everything depends on the IC that is used from DC/DC power supply. So if from the datasheet says it is supported - no sense to add one more step.
 
Hmmm. Both of the fleebay step downs I was looking at (LM2596HV and hrd) say they are switching but the hrd has a heat sink while the LM2596HV does not... can someone compare the two for this application?
 
kapelan said:
hrd ?
Click to expand...

Yes. It says it uses an "HRD module" there are hundreds of listings when you search for "HRD step down"...here is an excerpt from one description:

This HRD converter is a voltage switching regulator providing capable of driving a 3A load with good performance
and economic DCDC convertor.
It is using HRD module with minimum components to provide fixture DC output 5V.
2x capacitors 220uF 63v & 470uF 25v to provide guard noise filter at input and output and power indicator LED.
It can be become adjustable converter if add a variable resistor.
Input voltage: Wide range of input 12-50v.
 
O2Surplus said:
Yeah- I've looked at the MeanWell SCW12C-12. It's input voltage rating is higher than the LDD-H, so it would work great for our application. The trouble is, they're expensive as hell. I found prices ranging from $18 -$35 each :eek2:

I'll probably draw up a PcB for the LDD-H that includes SCW12C-12 just for fun, and hopefully, in the future, their prices will come down enough to be considered affordable.
Click to expand...

I excluded Mean Well DC/DC converters for the same reason. It's strange that the LDD series has built in DC/DC converters at a fraction of the cost.

There were a few sources of converters with a wide I/O voltage range posted within this thread for $6-8. They have screw terminals so I don't know if it's all that necessary to have them fit on a PCB. Most microcontrollers have a wide input range anyway. I think it's just the Typhon that takes 12v iirc.
 
mr.wilson said:
I excluded Mean Well DC/DC converters for the same reason. It's strange that the LDD series has built in DC/DC converters at a fraction of the cost.

There were a few sources of converters with a wide I/O voltage range posted within this thread for $6-8. They have screw terminals so I don't know if it's all that necessary to have them fit on a PCB. Most microcontrollers have a wide input range anyway. I think it's just the Typhon that takes 12v iirc.
Click to expand...


Yeah- I think the original intent of designing PcB's for the LDD was to eliminate as much wiring as possible. The various PcB's posted in this thread did that job admirably, but now we're trying to "kill more birds with the same stone." Having a source for 5V & 12V power on the same PcB makes sense, as it eliminates the need for an additional power supply & wiring. Not all LDD users may need that particular feature, but for those who do, we'll find a way to accommodate that need.
 
With O2's LDD board revision 3 - if you don't use a resistor or a jumper will the board work as the original version i.e. if power is lost to the controller will the LED's come at full power??. just asking because I am not confident in my soldering and may not install the resistor or jumper
 
fiddler12 said:
With O2's LDD board revision 3 - if you don't use a resistor or a jumper will the board work as the original version i.e. if power is lost to the controller will the LED's come at full power??. just asking because I am not confident in my soldering and may not install the resistor or jumper
Click to expand...


Yes- the LDD's will revert to full output without the pulldown resistor soldered to the PcB.
 
O2 could you add a dc to dc step down to hook up 2 or4 fans? Something like 12v @1A or maybe 2 amp to your 4up board? Or maybe the 5th spot on a 5up just thinking it would make hooking up fans easy and a cleaner look with no extra wires and no extra wall wart to power them
 
rott said:
O2 could you add a dc to dc step down to hook up 2 or4 fans? Something like 12v @1A or maybe 2 amp to your 4up board? Or maybe the 5th spot on a 5up just thinking it would make hooking up fans easy and a cleaner look with no extra wires and no extra wall wart to power them
Click to expand...

I think that's what they're discussing above:

O2Surplus said:
Yeah- I think the original intent of designing PcB's for the LDD was to eliminate as much wiring as possible. The various PcB's posted in this thread did that job admirably, but now we're trying to "kill more birds with the same stone." Having a source for 5V & 12V power on the same PcB makes sense, as it eliminates the need for an additional power supply & wiring. Not all LDD users may need that particular feature, but for those who do, we'll find a way to accommodate that need.
Click to expand...
 
Well Update For You :)

After a email saying don and on way on the 7th Sent Via air mail arrived today

<a href="http://s1084.photobucket.com/user/bigguyuk/media/Arduino%20Stuff/20130515_183150_zps1282a52b.jpg.html" target="_blank"><img src="http://i1084.photobucket.com/albums/j412/bigguyuk/Arduino%20Stuff/20130515_183150_zps1282a52b.jpg" border="0" alt=" photo 20130515_183150_zps1282a52b.jpg"/></a>

<a href="http://s1084.photobucket.com/user/bigguyuk/media/Arduino%20Stuff/20130515_183145_zpsa281ad00.jpg.html" target="_blank"><img src="http://i1084.photobucket.com/albums/j412/bigguyuk/Arduino%20Stuff/20130515_183145_zpsa281ad00.jpg" border="0" alt=" photo 20130515_183145_zpsa281ad00.jpg"/></a>

Big Thanks to O2Surplus Again

Best get bits orded to make these up

Anybody know best places to get bits from UK Preferred but happy to wait a bit longer :) as i need to get my solder skills upto date now
 
got 100 resisters coming off ebay
some terminal blocks of ebay and hopefully the right sockets from china ebay
what are the jumpers i need ? fro jp1 - 5

thanks again

then need to find a cheap source of the ldd-700 :)
 
bigguyuk said:
Well Update For You :)

After a email saying don and on way on the 7th Sent Via air mail arrived today

<a href="http://s1084.photobucket.com/user/bigguyuk/media/Arduino%20Stuff/20130515_183150_zps1282a52b.jpg.html" target="_blank"><img src="http://i1084.photobucket.com/albums/j412/bigguyuk/Arduino%20Stuff/20130515_183150_zps1282a52b.jpg" border="0" alt=" photo 20130515_183150_zps1282a52b.jpg"/></a>

<a href="http://s1084.photobucket.com/user/bigguyuk/media/Arduino%20Stuff/20130515_183145_zpsa281ad00.jpg.html" target="_blank"><img src="http://i1084.photobucket.com/albums/j412/bigguyuk/Arduino%20Stuff/20130515_183145_zpsa281ad00.jpg" border="0" alt=" photo 20130515_183145_zpsa281ad00.jpg"/></a>

Big Thanks to O2Surplus Again

Best get bits orded to make these up

Anybody know best places to get bits from UK Preferred but happy to wait a bit longer :) as i need to get my solder skills upto date now
Click to expand...

Hey, those look really nice. If I hadn't soldered my 3-way ones up and installed them I'd be on those.
 
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