CM6901_12 Datasheet, PDF (9/15 Pages) Champion Microelectronic Corp. – SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs

CM6901
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
VFB
2.5V
Vref
+
FEAO
.
V Tol
-
RT
OSC
RSET
Vref
Rest2
CT
Rset1
2 PWMings:
SR Ideal Diode PWMing (Synchronous Outputs)
SR Ideal Diode PWMing for synchronous drivers is accomplished by comparing the voltage signal at the RSET pin
to RTCT ramp. The pulse-width reduction happens when the voltage at the RSET is lower than 1.5V. This allows
safe operation of the power converter with synchronous rectification when the switching frequency is below the
highest resonant point frequency fr1.
Vout
Rf1
VFB
+
Rf3
2.5V ^-
FEAO
.
V Tol
OSC
1.5V
RSET
Vref
Rest2
Rset1
Vref
RT
-
+
3V
1.25V
.
TO Logic
CT
SRDRV
Decreasing Pulsewidth
with V(RSET)<1.5V
PRIDRV
2012/05/09 Rev2.0
Champion Microelectronic Corporation
Page 9