I have took a simulation from Analog for a forward converter, which generates 54V@1.5A.
In isolated power supplies I often see the opto-coupler technique, for feedback and control system. However, in the schematic, an additional component called LT1431 https://www.analog.com/media/en/technical-documentation/data-sheets/1431fe.pdf. The data sheet says it is a programmable reference, shunt regulator. But why is it in the circuit? What does it improve upon compared to using just opto-isolator alone? Does it improve load regulation upon transient events, or something along those lines?
Photo attached of circuit:
In isolated power supplies I often see the opto-coupler technique, for feedback and control system. However, in the schematic, an additional component called LT1431 https://www.analog.com/media/en/technical-documentation/data-sheets/1431fe.pdf. The data sheet says it is a programmable reference, shunt regulator. But why is it in the circuit? What does it improve upon compared to using just opto-isolator alone? Does it improve load regulation upon transient events, or something along those lines?
Photo attached of circuit:
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