Please refer to the design of MAXREFDES48# as follows to attain an output of 24V/2A.
1. Transformer T1: Use HanRun's HR102302
2. Inductor L1: Use Coilcraft's SER1390-473ML
3. Change C12 to 22nF, for example GRM31BR72D223KW01#
4. For C1 use three 10uF capacitors.
5. C17,C19,C20,C23: Use 10uF, for example GRM32EB31H106KA12#
6. N2,N3: Use SiSS40DN
7. R32: Use 550 kohm
8. R31: Use 3.5 kOhm
9. Remove C16, R20, R25, R35.
By implementing the modifications above, the output voltage of the reference design can be changed to 24V and the load efficiency at 2A can reach 94%.