AN1326 L6565准谐振控制器

AN1326 L6565准谐振控制器

AN1326
APPLICATION NOTE

L6565 QUASI-RESONANT CONTROLLER
by Claudio Adragna


A variable frequency version of flyback converter, commonly known as Quasi-resonant (QR) ZVS fly-
back, is largely used in certain applications, such as SMPS for TV, though it is well suited for other ap-
plications too.
This peculiar topology features several merits. Besides the others, which will be highlighted in the text,
one of them is to be a simple derivative of the standard square-wave flyback, well known