uc3844bvnguc3845bd ON Semiconductor, uc3844bvnguc3845bd Datasheet - Page 8

• Manufacturer Part Number: uc3844bvnguc3845bd
• Description: Current Mode Controller
• Manufacturer: ON Semiconductor

Capacitor C
Latch “Set”
Input
Output/
Compensation
Current Sense
Input
Latch “Reset”
Input
Output
Compensation
Feedback
T
R
C
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 SOIC-14 package.
T
T
Input
8(14)
V
4(7)
2(3)
1(1)
ref
2.5V
Amplifier
Error
Large R
R
R
UC3844B, UC3845B, UC2844B, UC2845B
Oscillator
+ 1.0mA
T
Internal
/Small C
Bias
Figure 16. Representative Block Diagram
T
2R
GND
R
Figure 17. Timing Diagram
5(9)
3.6V
http://onsemi.com
1.0V
Current Sense
Reference
Comparator
Regulator
-
+
8
UVLO
V
ref
R
S
T
UVLO
V
Q
CC
PWM
Latch
V
CC
+
-
7(12)
(See
Text)
36V
= Sink Only Positive True Logic
V
7(11)
Output
6(10)
Power Ground
5(8)
Current Sense Input
3(5)
Small R
C
V
CC
T
/Large C
T
V
in
Q1
R
S