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UC3844B 数据表(PDF) 11 Page - STMicroelectronics

部件名 UC3844B
功能描述  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
Download  15 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

UC3844B 数据表(HTML) 11 Page - STMicroelectronics

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D95IN353
+
-
+
RA
1
7
f =
R
BIAS
OSC
C
6
VREF
R
RB
+
-
+
-
EA
R
2R
R
S
Q
84
5
2
3
5K
5K
5K
NE555
8
4
2
1
5
TO ADDITIONAL
UCX84XAs
1.44
(RA + 2RB)C
Dmax =
RB
RA + 2RB
Figure 23: External Duty Cycle Clamp and Multi Unit Synchronization.
D95IN352
+
-
EA
+
R
2R
5
RT
1
2
EXTERNAL
SYNC INPUT
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
R
BIAS
OSC
CT
0.01
µF
47
4
8
VREF
R
Figure 22: External Clock Synchronization.
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
11/15


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