Guy: This TT selection is in line with the turbo trans data.
PTH04T230W with 680uF x 2 ESR 4 mΩ each , 1.5A transient response with 3.57kΩ Rtt= 3.57 kΩ= 18.5mV .
3 x100uf ceramics will reduce sinsodial ripple ( 20MHz scope) at 300KHz 14-16mV. Peak to peak.
the link to TT selection guide is
Tom