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UCC256301: 不需要辅助电源,为什么TIDA-01494还是外接了一个辅助电源

Part Number: UCC256301
Other Parts Discussed in Thread: TIDA-01503, UCC28180, TIDA-01494, , UCC256404

UCC25630x Selection Guide,UCC256301+PFC不需要辅助电源,但是UCC28180+UCC256301的参考设计(TIDA-01494)为什么要外接一个TIDA-01503的辅助电源?

另外UCC256301和UCC256404有什么区别?