uc3842td STMicroelectronics, uc3842td Datasheet - Page 12
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uc3842td
Manufacturer Part Number
uc3842td
Description
High Performance Current Mode Pwm Controller
Manufacturer
STMicroelectronics
Datasheet
1.UC3842TD.pdf
(15 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
UC3842TD
Manufacturer:
ST
Quantity:
20 000
Figure 24: Soft-Start Circuit
UC3842T - UC3843T - UC3844T - UC3845T
Figure 25: Soft-Start and Error Amplifier Output Duty Cycle Clamp.
C
12/15
R2
R1
BC109
8
4
2
1
C
1M
+
-
EA
V
CLAMP
8
4
2
1
+
R
R
=
1mA
·
+
-
R
1
R
EA
+ R
1
2
BIAS
OSC
2R
where 0 <V
+
R
R
R
1mA
5
V
Clamp
BIAS
OSC
CLAMP
1V
2R
<1V
R
+
+
-
-
5V
5
I
pk(max)
ref
Comp/Latch
5V
=
1V
S
R
ref
Q
V
CLAMP
R
S
+
+
-
-
D95IN354
+
-
7
S
R
Q
D95IN355
7
6
5
V
CC
R
S
V
in
Q1