Select the output capacitor value on the basis of one of the following, depending on which one is the limiting factor:
For flyback converters, ripple current rating often dictates the output capacitance value. The required ripple current rating can be calculated from Equation 55.
At rated 65-W load, ICAP(rms) = 5.9 ARMS. Capacitors C11 and C13 in Figure 43 are chosen to meet this ripple requirement, (each capacitor has a 2.5-A minimum rating at 105°C). Total output capacitance is 1360 μF.