UCC15241-Q1: Difference against UCC14241-Q1?

Ochi:

• Why do they have different power capability? What is difference in aspect of internal component or test parameters?
  • Typical TSHUT is 150C vs 160C which means that if both ICs are operating below their respective thermal shutdown, the power dissipations, efficiency will be the same. As output power is increased, theUCC14241 will shutdown at 150C compared to the UCC15241 which will continue to operate up to 160C. The additional 10C thermal capability, translates to additional ~500mW max power capability.
• They have different thermal shutdown, why? 
  • see previous answer
• Could we replace from UCC14241-Q1 to UCC15241-Q1 without changing external component?
  • Yes, both are pin-to-pin compatible, drop in replacement of each other.
•  Is there any cara about to use UCC15241-Q1 replaced from UCC14241-Q1?
  • No worries and you can see from the UCC14240EVM-052 User Guide:

Steve