Three mosfets in parallel provide an adjustable load. Current is sensed with low side resistor. Reference is provided externally (DAC or pot).
Input voltage and current are fed into a PGA which is sent off board.
There is also an 8-bit i2c i/o expander and 18-bit i2c ADC available.

Image

Main components:

  • TO-247 mosfet (IRFP450)
  • TO-220 current sense resistor (35W 0.01Ω)
  • 2ch programmable gain amplifier (MCP6S22)
  • i2c 18-bit ADC (MCP3422)
  • i2c i/o expander (SX1505)

Image

Advertisements