UCC28781: replace TOP257YN

Hello , 

The UCC28781 controller:
1.  Is a less expensive controller than the TOP switch;
2.  Uses Zero-Voltage-Switching (ZVS) to achieve much higher efficiency than the TOP switch;
3.  Can run at higher frequency to reduce magnetics size for higher power density; 
4.  Has many more programming modes for greater versatility;
5.  Can be used for higher output power levels at low-line than the TOP switch;
6.  Is available in an automotive-qualified version UCC28781-Q1. 

Regards,
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