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UC3845BD1 Datasheet(PDF) 8 Page - STMicroelectronics

Part # UC3845BD1
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC3845BD1 Datasheet(HTML) 8 Page - STMicroelectronics

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Figure 15 : Error Amp Configuration.
Zi
Zf
1mA
2
1
VFB
COMP
2.5V
D95IN345
+
-
Figure 16 : Under Voltage Lockout.
UC3842B
UC3844B
UC3843B
UC3845B
16V
8.4V
10V
7.6V
VON
VOFF
Vi
ON/OFF COMMAND
TO REST OF IC
7
<0.5mA
<17mA
ICC
VCC
VOFF VON
D95IN346
Figure 17 : 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.
During UVLO, the Output is low
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
8/15


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