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Número de pieza
componentes Descripción
UC2844D Ver la hoja de datos (PDF) - Motorola => Freescale
Número de pieza
componentes Descripción
Fabricante
UC2844D
High Performance Current Mode Controllers
Motorola => Freescale
UC2844D Datasheet PDF : 14 Pages
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UC3844, 45 UC2844, 45
Figure 15. Representative Block Diagram
VCC
VCC
7(12)
Vref
8(14)
R
2.5V
RT
R
Internal
Bias
4(7)
CT
Voltage Feedback
Input
2(3)
Output
Compensation
1(1)
Oscillator
+
1.0mA
+
–
Error
Amplifier
2R
R
Reference
+
36V
Regulator
+
VCC
–
+
UVLO
–
3.6V
+ – Vref
– UVLO
TQ
–
+
1.0V
S
Q
R
PWM
Latch
Current Sense
Comparator
VC
7(11)
Output
6(10)
Power Ground
5(8)
Current Sense Input
3(5)
Gnd 5(9)
+
–
Pin numbers in parenthesis are for the D suffix SO–14 package.
=
Sink Only
Positive True Logic
Vin
Q1
RS
Capacitor CT
Latch
‘‘Set’’ Input
Output/
Compensation
Current Sense
Input
Latch
‘‘Reset’’ Input
Output
Figure 16. Timing Diagram
Large RT/Small CT
Small RT/Large CT
8
MOTOROLA ANALOG IC DEVICE DATA
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