UC384XBD MOTOROLA [Motorola, Inc], UC384XBD Datasheet - Page 8

• Manufacturer Part Number: UC384XBD
• Description: HIGH PERFORMANCE CURRENT MODE CONTROLLERS
• Manufacturer: MOTOROLA [Motorola, Inc]

8
Capacitor C T
Latch “Set”
Input
Output/
Compensation
Current Sense
Input
Latch “Reset”
Input
Output
Compensation
Feedback
R T
C T
Voltage
Output/
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.
Input
8(14)
V ref
4(7)
2(3)
1(1)
2.5V
Amplifier
Error
Large R T /Small C T
R
R
Oscillator
+ 1.0mA
UC3844B, 45B UC2844B, 45B
Internal
Figure 15. Representative Block Diagram
Bias
2R
Gnd
Figure 16. Timing Diagram
R
5(9)
3.6V
1.0V
Current Sense
Reference
Comparator
Regulator
–
+
UVLO
V ref
S
R
UVLO
V CC
Q
PWM
Latch
V CC
+
–
7(12)
(See
Text)
MOTOROLA ANALOG IC DEVICE DATA
36V
= Sink Only Positive True Logic
Small R T /Large C T
V C
7(11)
Output
6(10)
Power Ground
5(8)
Current Sense Input
3(5)
V CC
V in
Q1
R S