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UC2845B Datasheet(PDF) 9 Page - STMicroelectronics

Part No. UC2845B
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC2845B Datasheet(HTML) 9 Page - STMicroelectronics

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Figure 18 : Slope Compensation Techniques.
RS
R1
IS
RSLOPE
CT
RT
VREG
8
RT/CT
ISENSE
4
3
5
GND
RS
R1
IS
RSLOPE
CT
RT
VREG
8
RT/CT
ISENSE
4
3
5
GND
D95IN348
Figure 19 : Isolated MOSFET Drive and Current Transformer Sensing.
7
6
COMP/LATCH
ISOLATION
BOUNDARY
D95IN349
5.0Vref
VCC
+
-
+
-
Q
S
R
3
R
RS
NS
C
Vin
Q1
NP
VGS Waveforms
+
0
+
0
-
-
50% DC
25% DC
Ipk =
V(pin 1) -1.4
3RS
NS
NP
()
UC3842B
UC3842B
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
9/15


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