Supernew high-side diode and TEC smart driver :)

[tribble]

3-channel with dc-dc and TEC? Typically, people are looking for low cost drivers for single-mode RGB projectors. For 3-4W RGB design, 4-channel driver is very actual (1ch/blue, 1ch/green, 2ch/red)

I'm building an RGB, single-diode-per-channel, single-mode box and would like a nice 3-ch driver for less than 200mW/channel, no TEC. As it is I can use flexmods, or buy someone else's 2-channel drivers and have channels left over. Maybe this kind of project is the minority.

[JRGixxerfreaK1]

yea a 3 channel low current (500mA per channel) max, in a ultra small dimension would be awesome!

[sbk]

So you plan to use a MCU, great!

H-bridge ok I can do without it no problem. Nice design for your old driver, have you not an extra driver like that somewhere on your desk for me?

H-bridge option implies another MCU and circuit design that result in increased cost...

My old driver, which I did for one of my projects has a 24 volt dc-dc converter. Based on this design, I can make 5A driver with input DC voltage up to 60V, if that makes any sense.

Attachment 44139

[Bbe]

I think a lot of people are making something similar

Maybe this kind of project is the minority.

Without onboard conerter for 24V PSU`s?

yea a 3 channel low current (500mA per channel) max, in a ultra small dimension would be awesome!

[Bbe]

I use MCU's in my simpledrivers as well

So you plan to use a MCU, great!

I have one free board but I want to keep it as a memento

have you not an extra driver like that

[tribble]

I think a lot of people are making something similar

Without onboard conerter for 24V PSU`s?

I'll answer your question with a question... have people had success in sharing PSU between scanners and diode drivers, while maintaining clean power to both subsystems? Not having done the experiment, I would be concerned a little about noise on the power lines affecting either diode modulation linearity or scanner positional linearity/accuracy with both subsystems connected to the same PS. Also, the load on the PSUs would become imbalanced; one side of the +- 24V is going to be more heavily loaded than the other, and I wonder if that could introduce asymmetry in the scanning output.

However, the proof is in the pudding, and if this arrangement has been done successfully and tested to show clean modulation and clean scanned lines without a lot of extra filtering components, I say happy day and throw my concerns away! But, I would want to see it. There is certainly the draw of having one less PSU in the box to design around, especially if the goal is size reduction.

Small DC-DC converters are widely available. I think if you wanted to share a PSU with a low-voltage driver board it would be trivial to add an external DC-DC converter. If you wanted to use separate PSUs, would an onboard DC-DC converter become a liability? If its only impact is extra cost then I don't know that I would object to it. Might make it harder to increase the size of the storage caps feeding the driver transistors, though. Lots of tradeoffs to consider. That's the joy of design. :-)

[Bbe]

I can only say that it's quite obvious for me. I use converters for extra diode line protection and improve driver efficiency. But people think differently. For some it may be a good idea if the scanner psu has enough power.

I would be concerned a little about noise on the power lines affecting

[Bbe]

There were no updates here for a long time )) Fix it....

"Simple Peltier TEC controller for simple cooling"

Main features:
Linear output with TB PID characteristic
Upto 8A with low heat emission.
Limiting the output voltage (25% 50% 100% Vin, etc) for different TEC modules.
Hot (heatsink) and cold side temperarure control, overheat shutdown
Various options of the temperature ranges
Status LED's, etc...



I called it SimpleTEC.