Rectifier ripple on DC-DC buck converters
As long as the LMZ36002 operates within the recommended input voltage limits, it should generate the required DC output voltage without a problem. As you correctly noted, the efficiency is dependent on the input voltage. A point you will need to investigate is line rejection. Since there is a significant ripple component on the input voltage, a small component of may propagate to the output. It all depends on the modulation strategy of the DC-DC converter and also the bandwidth of the voltage control loop. A quick test should reveal whether the converter has good line rejection or not. My guess would be that it has good line rejection since the switching frequency is so high and there are no external components used in the control loop. This would tend to indicate that the bandwidth of the internal controller is high and it can respond rapidly to changes in the input voltage. You'll probably only notice a few mV of ripple.