Here are the power supply specs.
Input - 50V DC (support up to 75V)
Output - 30V DC, max DC current 1.5A, peak current 15A (module should support high output transient current, that may go upto almost 8-10 times at switching)
Output capacitive load of circuit - apart from the required low ESR output at module, the circuit have a dedicated cap load of total 1500uF (2x750uF) tantalum (http://www.digikey.com/product-detail/en/vishay-sprague/STE750-75T4KI/718-1687-ND/1587386) that has an ESR of 0.5 ohm per cap.
Ripple: Stable converter with minimum ripple (around 50mV) at output.
Need your help identifying suitable part?
Will LM5116 or LM5085 work? If so, which is better suited for the application?