Important! This design is still under development and design is open to changes. Currently preRevA is the first version of this design.

chassis

General Info

EL8020 is a 400W programmable electronic load custom designed for OSIP to be in a 10HP eurorack enclosure size. It is capable of handling 80V or 20A max inputs dissipating 400W with heatsink reaching 85°C at full fan speed without any problems. It uses 4xIRFP250N mosfets as load to dissipate 100W per mosfet. Cooling is provided by 2xFFB0412UHN 23000RPM 26.5CFM fans from Delta Electronics and a LGA775 compatible 1U skived copper cooler (can be seen in the photo of the internal assembly) with a custom 3D printed fan shroud.

EL8020 design uses:
-RP2040 MCU for general system control.
-24bit ADS1220 ADC for external/internal voltage sensing and current measurements.
-16bit DAC8565 DAC for setting HW OVP+OCP threshold and controlling set current of the load circuitry.
-EMC210x fan controller for controlling fan speeds and measuring intake, heatsink and exhaust air temps.

Current Info

Currently EL8020 is in preRevA and design will be published as a “untested revA design” when the problems in current revision are found and resolved.

EL8020 as of right now can handle teorically 400W aka 80V@5A or 20V@20A but with my current setup I’m only able to source 48V and 17A max so further testing is to be done. Thermally it reaches a thermal equilibrium of 95°C at 400W with 100% fan speed(2x26.5CFM).

chassis
Render of the EL8020 PCB assembly
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EL8020 PCB with fans, heatsink and fan shroud mounted.