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E-UC3843BD1 Datasheet, PDF (9/15 Pages) STMicroelectronics – HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Figure 18 : Slope Compensation Techniques.
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
IS
RSLOPE
R1
RS
VREG
RT
RT/CT
CT
8
4
UC3842B
ISENSE
3
5
GND
IS
RSLOPE
R1
RS
VREG
RT
RT/CT
CT
8
4 UC3842B
ISENSE
3
5
GND
D95IN348
Figure 19 : Isolated MOSFET Drive and Current Transformer Sensing.
VCC
Vin
7
+
5.0Vref
-
+
-
S
Q
R
-
+
COMP/LATCH
6
3
C
D95IN349
ISOLATION
BOUNDARY
R
RS
VGS Waveforms
Q1
+
+
0
0
-
50% DC
-
25% DC
( ) Ipk =
V(pin 1) -1.4
3RS
NS
NP
NS
NP
9/15
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