UC3842N Fairchild Semiconductor, UC3842N Datasheet - Page 3
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UC3842N
Manufacturer Part Number
UC3842N
Description
IC CTLR PWM CURR MODE 8-DIP
Manufacturer
Fairchild Semiconductor
Datasheet
1.UC3842D.pdf
(12 pages)
Specifications of UC3842N
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
500kHz
Duty Cycle
100%
Voltage - Supply
11.5 V ~ 30 V
Buck
No
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
0°C ~ 70°C
Package / Case
8-DIP (0.300", 7.62mm)
Frequency-max
500kHz
Duty Cycle (max)
100 %
Output Current
1000 mA
Mounting Style
Through Hole
Switching Frequency
500 KHz
Operating Supply Voltage
30 V
Supply Current
17 mA
Maximum Operating Temperature
+ 70 C
Fall Time
35 ns
Minimum Operating Temperature
0 C
Rise Time
45 ns
Synchronous Pin
No
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
UC3842NFS
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
UC3842N
Manufacturer:
ST
Quantity:
20 000
Part Number:
UC3842NG4
Manufacturer:
TI/德州仪器
Quantity:
20 000
Electrical Characteristics
(V
Parameter
REFERENCE SECTION
Reference Output Voltage
Line Regulation
Load Regulation
Short Circuit Output Current
OSCILLATOR SECTION
Oscillation Frequency
Frequency Change with
Voltage
Oscillator Amplitude
ERROR AMPLIFIER SECTION
Input Bias Current
Input Voltage
Open Loop Voltage Gain
Power Supply Rejection Ratio
Output Sink Current
Output Source Current
High Output Voltage
Low Output Voltage
CURRENT SENSE SECTION
Gain
Maximum Input Signal
Power Supply Rejection Ratio
Input Bias Current
OUTPUT SECTION
Low Output Voltage
High Output Voltage
Rise Time
Fall Time
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold
Min. Operating Voltage
(After Turn On)
CC
=15V, R
T
=10k , C
T
=3.3nF, T
V
I
A
Symbol
V
SOURCE
V
OPR(MIN)
V
PSRR
PSRR
V
= 0 C to +70 C, unless otherwise specified)
V
f/ V
I
I
I
TH(ST)
I(MAX)
G
V
V
I(E>A)
V
V
V
V
BIAS
SINK
BIAS
I
G
OSC
REF
SC
t
t
OH
OH
REF
REF
VO
OL
OL
f
R
F
V
CC
UC3842/UC3844
UC3843/UC3845
T
12V
1mA
T
T
12V
V
2V
12V
V
V
V
V
(Note 1 & 2)
V
12V
I
I
I
I
T
T
UC3842/UC3844
UC3843/UC3844
SINK
SINK
SOURCE
SOURCE
J
A
J
J
J
pin1
pin2
pin2
pin2
pin2
pin1
= 25 C, I
= 25 C
= 25 C, C
= 25 C, C
= 25 C
V
= 2.5V
= 2.7V, V
= 2.3V, V
= 2.3V, R
= 2.7V, R
= 5V(Note 1)
= 20mA
= 200mA
V
V
V
V
O
I
REF
CC
CC
CC
CC
= 20mA
= 200mA
Conditions
4V (Note3)
REF
L
L
25V
25V
25V (Note3)
25V (Note 1,3)
20mA
= 1nF (Note 3)
= 1nF (Note 3)
pin1
pin1
L
L
-
-
-
= 1mA
= 15k
= 15k
= 5V
= 1.1V
to GND
to Pin 8
Min.
4.90
2.42
2.85
14.5
-0.6
0.9
7.8
8.5
7.0
47
65
60
13
12
2
5
-
-
-
-
-
-
-
-
-
-
-
-
-
UC3842/UC3843/UC3844/UC3845
Typ.
5.00
-100
0.05
2.50
0.08
13.5
13.0
16.0
10.0
-0.1
-1.0
1.6
0.8
1.4
8.4
7.6
52
90
70
70
45
35
-3
6
6
7
6
3
1
Max.
-180
5.10
2.58
3.15
17.5
11.5
150
150
1.1
1.1
-10
0.4
2.2
9.0
8.2
20
25
57
-2
1
-
-
-
-
-
-
-
-
-
V
Unit
kHz
V/V
mV
mV
mA
mA
mA
dB
dB
dB
ns
ns
%
P-P
V
V
V
V
V
V
V
V
V
V
V
V
V
A
A
3