ST UC2842B - Page 9

Figure 18 : Slope Compensation Techniques.
R
S
R
1
I
S
R
SLOPE
C
T
R
T
V
REG
8
R
T
/C
T
I
SENSE
4
3
5
GND
R
S
R
1
I
S
R
SLOPE
C
T
R
T
V
REG
8
R
T
/C
T
I
SENSE
4
3
5
GND
D95IN348
Figure 19 : Isolated MOSFET Drive and Current Transformer Sensing.
7
6
COMP/LATCH
ISOLATION
BOUNDARY
D95IN349
5.0V
ref
V
CC
+
-
+
-
Q
S
R
+
-
3
R
R
S
N
S
C
V
in
Q1
N
P
V
GS
Waveforms
+
0
+
0
--
50% DC 25% DC
I
pk
=
V
(pin 1)
-1.4
3R
S
N
S
N
P
()
UC3842B
UC3842B
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
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