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R2A20117 ~ ~. 4. COMP Vcc 5. . 2 ZCD / . . R2A20117 . OVP2. PFC out. PFC out. FB. OVP1. (FB*1.09). DOVP. (FB*1.05). FB. 3 Dynamic over voltage protection. R2A20112 has Dynamic and Static OVP. 2010 7 14 R2A20117 OVP2 R2A201118A PFC Jul 14, 2010 The R2A20118A is based on R2A20117 , and additional functions are OVP2 and Brownout. The R2A20118A adopts critical conduction mode R2A20117 . Critical conduction mode interleaving. R2A20118. Critical conduction mode interleaving. R2A20132. Critical conduction mode interleaving.