Transcription of CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 …
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CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 …
CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs 2017/05/31 Champion Microelectronic Corporation Page 1 GENERAL DESCRIPTION CM6901 is a SLS, SRC/LLC + SR resonant Controller and it can operate at both SRC and LLC region with synchronous rectification to achieve high efficiency. Its unique features: FM + 2 PWMING modes. It is used for DC-DC conversion in offline application. Light load regulation is accomplished by transitioning the Controller from frequency modulation mode into PWM mode. We call this is Light load PWMING function. When ac turn off, bulk input voltage will drop. The switching frequency is below the highest resonant point frequency fr1=LrCr 2/1;Lr: resonant choke; Cr: resonant cap . SR Ideal Diode PWMING for synchronous drivers is accomplished by comparing the voltage signal at the RSET pin to RTCT ramp.
CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs 2017/05/31 Rev2.8 Champion Microelectronic Corporation Page 3 BLOCK DIAGRAM Soft start
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