My application requires me to convert an unregulated 36-60 volt dc source to 12 volt dc requiring around 15 amps of current. IC PT4661 can give me dual isolated 5 volt/3.3 volt source at 15 amps. My query corresponds to the isolation...is it between the o/p and i/p...if so can I safely put 3 outputs in series and generate 15 volts. Thank you.