CM6901GIP CHAMP [Champion Microelectronic Corp.], CM6901GIP Datasheet - Page 11

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

Light Load PWMING
In Application , low gain configuration accomplished by connecting R
gain for the PWM is determined by R
the controller goes into FM and PWM simultaneously is equal to :
VRset = D_IN+ × (1+R
Varyin R
frequency will vary propotionally according to 1.75*R
ramp. For proper operation, select R
than 5uA.
2009/11/02 Rev1.4
set
R f 1
from VR
R f 3
V o u t
set
2 . 5 V
f4
to VR
/R
V F B
f5
) - (R
SLS (SRC/LLC+SR) Controller with 1 FM+2 PWMs
set
+
-
f4
+ 1.75 × R
/R
D _ I N +
f5
f4
Champion Microelectronic Corporation
f5
) × 3 where 3 is the peak voltage of RTCT
and R
value so that the current through R
V r e f
F E A O
f4
f5
/R
where the gain is equal to -R
f5
R f 4
D _ I N -
will cause the duty cycle to vary from 50% to 0% while the
f4
/R
V T o I
f5
+
-
where 1.75 is the peak-to-peak voltage of the RTCT
R S E T
R f 5
f4
D E A O
and R
f5
f5
O S C
f5
in the closed loop configuration . The
/R
{((D_IN+) - 1.2)/R
f4
+
-
. The voltage of VR
R T C T
V r e f
R T
C T
Page 11
f5
} should be less
CM6901
P W M
set
at which