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UC3843BD Datenblatt(PDF) 9 Page - Motorola, Inc

Teilenummer UC3843BD
Bauteilbeschribung  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Hersteller  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

UC3843BD Datenblatt(HTML) 9 Page - Motorola, Inc

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UC3842B, 43B UC2842B, 43B
9
MOTOROLA ANALOG IC DEVICE DATA
+
Reference
Regulator
VCC
UVLO
+
Vref
UVLO
3.6V
36V
S
R
Q
Internal
Bias
+ 1.0mA
Oscillator
2.5V
R
R
R
2R
Error
Amplifier
Voltage
Feedback
Input
Output/
Compensation
Current Sense
Comparator
1.0V
VCC
7(12)
Gnd
5(9)
VC
7(11)
Output
6(10)
Power Ground
5(8)
Current Sense Input
3(5)
RS
Q1
VCC
Vin
1(1)
2(3)
4(7)
8(14)
RT
CT
Vref
= Sink Only Positive True Logic
Pin numbers adjacent to terminals are for the 8–pin dual–in–line package.
Pin numbers in parenthesis are for the D suffix SO–14 package.
Figure 17. Representative Block Diagram
Figure 18. Timing Diagram
Large RT/Small CT
Small RT/Large CT
PWM
Latch
(See
Text)
Capacitor CT
Latch
“Set” Input
Output/
Compensation
Current Sense
Input
Latch
“Reset” Input
Output


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