Hi, ADI Engineer.
I want to ask about how to switch boost mode in LT8228 in the simulation of LTSpice as currently, I want to test and see the simulation of LT8228 in boost mode by using its macro model's test fixture which is Buck 560W (14V 40A) and Boost 480W (48V 10A) Parallel Regulators and the schematic diagram is given below in Figure 1. The simulation is for buck mode actually in Figure 2 but I want to test boost mode.
Figure 1 Figure 2
Firstly, I tried to switch the V1 to Vout and V2 to Vin like in Figure 3 but then the Vout result is not what it should be which is far lesser in pico voltage value. So, I tried to pull the DRXN pin low to select boost regulation mode after I read the datasheet and I just change the resistor value at UV1 pin to make it lesser than 1.2V so that it can switch to boost mode by just using equation V=IR and Kirchoff Current Law. Still, the voltage output is still the same as the previous one which is pico voltage value like in Figure 4.
So, I really need help to do the simulation for LT8228 in boost mode as later I need to develop a boost converter for 4800W (96V 50A) and from what I research that this LT8228 is capable of performing this DC-DC power convertion as it can use Ishare for greater load current and Vout up to 100V. I hope that this question can be replied soon and thank you very much for anyone who responds to this question.
Third Year Electrical Power Engineering Student