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E-UC3845BD1013TR

P1-P3P4-P6P7-P9P10-P12P13-P15
Figure 20 : Latched Shutdown.
D95IN350
BIAS
+
-
EA
R
+
OSC
2N
3905
2N
3903
1mA
R
R
2R
1
2
8
4
SCR must be selected for a holding current of less than 0.5mA at T
A(min)
.
The simple two transistor circuit can be used in place of the SCR as shown. All resistors are 10K.
5
D95IN351
+
-
EA
R
i
+
1mA
R
d
R
2R
5
C
f
R
f
1
2
From V
O
2.5V
+
-
EA
R
P
+
1mA
R
d
R
2R
5
C
f
R
f
1
2
From V
O
2.5V
Error Amp compensation circuit for stabilizing any current-mode topology except
for boost and flyback converters operating with continuous inductor current.
C
P
R
i
Error Amp compensation circuit for stabilizing current-mode boost and flyback
topologies operating with continuous inductor current.
Figure 21: Error Amplifier Compensation
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
10/15
D95IN353
+
-
+
R
A
1
7
f =
R
BIAS
OSC
C
6
V
REF
RR
B
+
-
+
-
EA
R
2R
R
S
Q
84
5
2
3
5K
5K
5K
NE555
8
4
2
1
5
TO ADDITIONAL
UCX84XAs
1.44
(R
A
+ 2R
B
)C
D
max
=
R
B
R
A
+ 2R
B
Figure 23: External Duty Cycle Clamp and Multi Unit Synchronization.
D95IN352
+
-
EA
+
R
2R
5
R
T
1
2
EXTERNAL
SYNC INPUT
The diode clamp is required if the Sync amplitude is large enough to cause
the bottom side of C
T
to go more than 300mV below ground
R
BIAS
OSC
C
T
0.01µF
47Ω
4
8
V
REF
R
Figure 22: External Clock Synchronization.
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
11/15
D95IN354
+
R
BIAS
OSC
C
R
+
-
+
-
EA
R
2R
R
S
Q
8
4
2
1
5
1mA
1V
+
-
5V
ref
1MΩ
Figure 24: Soft-Start Circuit
D95IN355
+
R
BIAS
OSC
C
R
+
-
+
-
EA
R
2R
R
S
Q
8
4
2
1
5
1mA
1V
+
-
5V
ref
R2
R1
V
Clamp
+
-
Comp/Latch
7
R
S
V
CC
Q1
V
in
7
6
5
BC109
V
CLAMP
= ·
R
1
R
1
+ R
2
where 0 <V
CLAMP
<1V I
pk(max)
=
V
CLAMP
R
S
Figure 25: Soft-Start and Error Amplifier Output Duty Cycle Clamp.
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
12/15
P1-P3P4-P6P7-P9P10-P12P13-P15

E-UC3845BD1013TR

Mfr. #:
Buy E-UC3845BD1013TR
Manufacturer:
STMicroelectronics
Description:
Switching Controllers 0.5mA Current Mode
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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