UC3843BD1 ON Semiconductor, UC3843BD1 Datasheet - Page 9
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UC3843BD1
Manufacturer Part Number
UC3843BD1
Description
IC CTRLR CURRENT MODE HP 8SOIC
Manufacturer
ON Semiconductor
Datasheet
1.UC3842BDR2G.pdf
(21 pages)
Specifications of UC3843BD1
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
275kHz
Duty Cycle
96%
Voltage - Supply
8.2 V ~ 25 V
Buck
No
Boost
Yes
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
0°C ~ 70°C
Package / Case
8-SOIC (3.9mm Width)
Frequency-max
275kHz
Duty Cycle (max)
96 %
Output Voltage
4.9 V to 5.1 V
Output Current
1000 mA
Mounting Style
SMD/SMT
Switching Frequency
500 KHz
Operating Supply Voltage
30 V
Maximum Operating Temperature
+ 70 C
Fall Time
50 ns
Minimum Operating Temperature
0 C
Rise Time
50 ns
Synchronous Pin
No
Topology
Boost, Flyback, Forward
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
UC3843BD1OS
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Capacitor C
Latch
“Set" Input
Output/
Compensation
Current Sense
Input
Latch
“Reset" Input
Output
T
Compensation
Feedback
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.
R
C
Voltage
Output/
T
T
Input
8(14)
V
4(7)
2(3)
1(1)
ref
2.5V
Amplifier
Large R
Error
R
R
T
Oscillator
/Small C
+ 1.0mA
Figure 18. Representative Block Diagram
Internal
Bias
T
Figure 19. Timing Diagram
2R
GND
R
http://onsemi.com
5(9)
3.6V
1.0V
Current Sense
Reference
Comparator
Regulator
9
-
+
UVLO
V
ref
S
R
UVLO
V
Q
CC
PWM
Latch
V
CC
+
-
7(12)
(See
Text)
36V
Small R
= Sink Only Positive True Logic
V
7(11)
Output
6(10)
Power Ground
5(8)
Current Sense Input
3(5)
C
T
V
/Large C
CC
T
V
in
Q1
R
S