Can anybody please publish a close up pictures of Dallee Electronic Reverse Unit (E-Unit) - 12 Amp ?
Im looking for possible detailed pictures for TOP and BOTTOM of the unit. The ones published on the Dallee webpage are not good enough for my project. They don't show the PCB from all the sides so it's impossible to esitime by raw dminensions if they fit.
https://www.dallee.com/Electro...AC-or-DC-motors-1400
I appreciate your help.
Chris
Can't help you with the pics. But I did look at the board.
What's your application. That is, how many sustained many amps at what voltage? What type of Loco?
Semiconductors mostly fail from heat. This module's power semiconductors appear to be surface mount on the underside of the PCB. Some SMDs use an integral design with the PCB's metal ground plane as their heat sink. Others need external heatsinks in direct contact with the top of the chip (underneath in this case) The pic below infers these are the latter. They use the Loco.'s large metal chassis as a heatsink.
"The paint was removed to obtain a better mounting to the chassis. This yields better heat dissipation."
That's good, in fact necessary in this application - dissipating the heat to the outside air via the large chassis instead of into the loco's shell. Remember children's Easy Bake Ovens? Bake a small cake quickly with a light bulb. Same scenario, smaller scale.
IMHO, you would be limited to direct mounting to the chassis or risk quick failure. And I would use heat sink paste between the top of the chips and the chassis. Perhaps Dallee supplies a small tube or heat sink tape with the product.
A pic or better description of you application would help with possible alternatives ...
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