CM6901GIP datasheet(9/15 Pages) CHAMP

Part #	CM6901GIP

Description	SLS (SRC/LLCSR) Controller with 1 FM2 PWMs

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Manufacturer	CHAMP [Champion Microelectronic Corp.]

Direct Link	http://www.champion-micro.com

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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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