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UC3842 데이터시트(PDF) 8 Page - STMicroelectronics

부품명 UC3842
상세설명  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC3842 데이터시트(HTML) 8 Page - STMicroelectronics

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Figure 14 : Error Amp Configuration.
Zi
Zf
1mA
2
1
VFB
COMP
2.5V
D95IN345
+
-
Figure 15 : Under Voltage Lockout.
UC3842A
UC3844A
UC3843A
UC3845A
16V
8.4V
10V
7.6V
VON
VOFF
Vi
ON/OFF COMMAND
TO REST OF IC
7
<0.5mA
<17mA
ICC
VCC
VOFF VON
Fig.15-UC3842A
Figure 16 : Current Sense Circuit .
ERROR
AMPL.
2R
R1V
CURRENT
SENSE
COMPARATOR
1
CURRENT
SENSE
COMP
C
RS
R
3
5
GND
IS
D95IN347
Peak current (is) is determined by the formula
1.0 V
IS max
RS
A small RC filter may be required to suppress switch transients.
UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
8/15


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