UC3844B STMicroelectronics, UC3844B Datasheet - Page 9

• Manufacturer Part Number: UC3844B
• Description: Current Mode PWM
• Manufacturer: STMicroelectronics

Figure 19 : Isolated MOSFET Drive and Current Transformer Sensing.
Figure 18 : Slope Compensation Techniques.
R
I
S
S
5.0V ref
+
+
-
R
-
R
SLOPE
1
COMP/LATCH
R
S
Q
+
-
R
C
I
R
SENSE
T
T
V
V
T
REG
/C
CC
T
7
8
4
3
D95IN349
UC3842B
5
GND
6
3
C
BOUNDARY
ISOLATION
R
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
R
S
R
I
S
S
R
R
SLOPE
1
N
S
Q1
V
in
N
P
R
C
I
R
T
T
SENSE
V
T
REG
/C
+
0
-
I
pk
T
50% DC
=
V
8
4
3
V
(pin 1)
GS
3R
UC3842B
Waveforms
S
-1.4
5
+
0
-
GND
( )
D95IN348
25% DC
N
N
S
P
9/15