CM6901 Datasheet, PDF (10/15 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
V re f
VFB
+
2.5V
-
V To I
RT
OSC
CT
RSET
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
Vref
R f1
VFB
+
Rf3
2.5V
-
FEAO
V To I
RSET
Rf4
OSC
1.5V
3V
RT
1.25V
+
-
CT
To
Logic
SRDRV
P R ID R V
Decreasing Pulsewidth
with V(RSET)<1.5V
2009/11/02 Rev1.4
Champion Microelectronic Corporation
Page 10