Answer is no (cannot operate in CCM). The MAX17690 is a peak current mode, fixed-frequency switching controller specifically designed for the isolated Fly Back topology operating in Discontinuous Conduction Mode (DCM). The device senses the isolated output voltage directly from the primary-side Fly Back waveform during the off-time of the primary switch. Device samples the reflected output voltage information on the primary winding during the time when the primary NMOSFET is turned-off, and energy stored during the on-time is being delivered to the secondary. The sampling takes place when the secondary current is near to zero to nullify any effect of forward voltage drop of the rectifier diode. MAX17690 is designed to work in DCM mode and can NOT be used in CCM mode.