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| E-UC3843BD1 Datasheet, PDF (11/15 Pages) STMicroelectronics – HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER | |||
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Figure 22: External Clock Synchronization.
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
EXTERNAL
SYNC INPUT 0.01µF
VREF
8
RT
4
CT
2
47â¦
1
R
R
+
+
-
EA
BIAS
OSC
2R
R
5
The diode clamp is required if the Sync amplitude is large enough to cause
the bottom side of CT to go more than 300mV below ground
D95IN352
Figure 23: External Duty Cycle Clamp and Multi Unit Synchronization.
VREF
RA
8
4
RB
5K
6
+
3
5
R
-
5K
Q
7
+
2
S
-
C
5K
1
NE555
1.44
f=
(RA + 2RB)C
Dmax =
RB
RA + 2RB
8
R
BIAS
R
4
OSC
+
+
2
-
EA
1
2R
R
5
TO ADDITIONAL
UCX84XAs
D95IN353
11/15
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