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CM6901GIP Datasheet(PDF) 9 Page - Champion Microelectronic Corp. |
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CM6901GIP Datasheet(HTML) 9 Page - Champion Microelectronic Corp. |
9 / 15 page CM6901 SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs 2009/11/02 Rev1.4 Champion Microelectronic Corporation Page 9 Timing Diagram Delay Time PRIDRV PRIDRVB Dead Time Delay Time SRDRVB SRDRV Oscillator The oscillator frequency is determined by the values of RT and CT. fosc = 1 / (tRAMP + t DEADTIME) tRAMP = RT * CT * ln((VREF + ICHG*RT -1.25)/(VREF + ICHG*RT -3)) where ICHG = 4*(FEAO-VBE)/RSET tDEADTIME = 2.5V/2.5mA * CT = 850 * CT Resonant Section FM Modulator Frequency modulation of the resonant controller section is accomplished by controlling the charging current of the oscillator through resonant error amplifier. The frequency of the resonant section is ½ of the oscillator frequency. Compensation is accomplished by connecting R and C in series to the FEAO pin. ICHG = 4*(FEAO-VBE)/RSET ICHG(max) = 20V/RSET |
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