CM6901GIP CHAMP [Champion Microelectronic Corp.], CM6901GIP Datasheet - Page 9

• Manufacturer Part Number: CM6901GIP
• Description: SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
• Manufacturer: CHAMP [Champion Microelectronic Corp.]

Timing Diagram
Oscillator
The oscillator frequency is determined by the values of RT and CT.
f
t
t
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.
I
I
2009/11/02 Rev1.4
osc
RAMP
DEADTIME
CHG
CHG(max)
= 1 / (t
= 4*(F
= RT * CT * ln((V
= 20V/R
RAMP
= 2.5V/2.5mA * CT = 850 * CT
EAO
-V
+ t
SRDRVB
SRDRV
BE
PRIDRVB
SET
PRIDRV
DEADTIME
)/R
SET
REF + ICHG*RT
)
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
Dead Time
Delay Time
-1.25)/(V
Champion Microelectronic Corporation
REF + ICHG*RT
Delay Time
-3)) where I
CHG
= 4*(F
EAO
-V
BE
)/R
SET
Page 9
CM6901