Hello, I'm an EE student working on my final project for my undergraduate degree and this is my first time on here.
Both the data sheets for the LT3042 and LTC6655-5 show this schematic and I think it's just perfect for combating drift problems and powering my 5V VCO. However, when I simulate this exact design in LTSpice the output of the LT3042 is 6 volts instead of 5. The output of the DC reference reads 5 exactly, but I don't think the LT3042 is sensing that on the sense pin. My VCO needs 50 mA to power so I placed an equivalent resistor that would draw 50 mA, but it's still 6V. I also tried limiting the current and my output remains the same. When I limit the current into the LT3042, the voltage begins to drop, but I believe I'm just getting too close to the dropout voltage. I'm understanding that the LTC6655-5 reference would provide the stable voltage, but I'm not seeing that result in the simulation.
Also, I cant seem to find any reference layouts for this design anywhere, only for the LT3042 (DC2246B) demo board and the LTC6655-5 eval board (DC2095A-C) separately.
Any help would be greatly appreciated, thank you!
