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UC3845D Datasheet(PDF) 8 Page - ON Semiconductor

No. de pieza UC3845D
Descripción Electrónicos  High Performance Current Mode Controllers
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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UC3845D Datasheet(HTML) 8 Page - ON Semiconductor

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UC3844, UC3845, UC2844, UC2845
http://onsemi.com
8
+
Sink Only
Positive True Logic
=
RS
+
Internal
Bias
Reference
Regulator
Oscillator
S
R
Q
Vref
UVLO
3.6V
36V
VCC
7(12)
Q1
Vin
VCC
VC
7(11)
6(10)
5(8)
3(5)
+
1.0mA
Error
Amplifier
1(1)
2(3)
4(7)
8(14)
5(9)
GND
Output
Compensation
Voltage Feedback
Input
RT
CT
Vref
PWM
Latch
Current Sense
Comparator
R
R
Power Ground
Current Sense Input
2R
R
1.0V
Pin numbers in parenthesis are for the D suffix SOIC−14 package.
Q
T
+
+
+
+
+
VCC
UVLO
Output
2.5V
Figure 16. Representative Block Diagram
Output/
Compensation
Current Sense
Input
Latch
‘‘Reset’’ Input
Output
Capacitor CT
Latch
‘‘Set’’ Input
Large RT/Small CT
Small RT/Large CT
Figure 17. Timing Diagram


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