UC3842/UC3843/UC3844/UC3845
Electrical Characteristics
(V
CC
=15V, R
T
=10kΩ, C
T
=3.3nF, T
A
= 0°C to +70°C, unless otherwise specified)
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
Start Threshold
Min. Operating Voltage
(After Turn On)
V
OL
I
SINK
= 20mA
I
SINK
= 200mA
V
OH
t
R
t
F
I
SOURCE
= 20mA
I
SOURCE
= 200mA
T
J
= 25°C, C
L
= 1nF (Note 3)
T
J
= 25°C, C
L
= 1nF (Note 3)
UC3842/UC3844
UC3843/UC3845
UC3842/UC3844
UC3843/UC3844
-
-
13
12
-
-
14.5
7.8
8.5
7.0
0.08
1.4
13.5
13.0
45
35
16.0
8.4
10.0
7.6
0.4
2.2
-
-
150
150
17.5
9.0
11.5
8.2
V
V
V
V
ns
ns
V
V
V
V
G
V
V
I(MAX)
PSRR
I
BIAS
(Note 1 & 2)
V
pin1
= 5V(Note 1)
12V
≤
V
CC
≤
25V (Note 1,3)
-
2.85
0.9
-
-
3
1
70
-3
3.15
1.1
-
-10
V/V
V
dB
µA
I
BIAS
V
I(E>A)
G
VO
PSRR
I
SINK
I
SOURCE
V
OH
V
OL
V
pin1
= 2.5V
2V
≤
V
O
≤
4V (Note3)
12V
≤
V
CC
≤
25V (Note3)
V
pin2
= 2.7V, V
pin1
= 1.1V
V
pin2
= 2.3V, V
pin1
= 5V
V
pin2
= 2.3V, R
L
= 15kΩ to GND
V
pin2
= 2.7V, R
L
= 15kΩ to Pin 8
-
-
2.42
65
60
2
-0.6
5
-
-0.1
2.50
90
70
7
-1.0
6
0.8
-2
2.58
-
-
-
-
-
1.1
µA
V
dB
dB
mA
mA
V
V
f
∆f/∆V
CC
V
OSC
T
J
= 25°C
12V
≤
V
CC
≤
25V
-
47
-
-
52
0.05
1.6
57
1
-
kHz
%
V
P-P
V
REF
∆V
REF
∆V
REF
I
SC
T
J
= 25°C, I
REF
= 1mA
12V
≤
V
CC
≤
25V
1mA
≤
I
REF
≤
20mA
T
A
= 25°C
4.90
-
-
-
5.00
6
6
-100
5.10
20
25
-180
V
mV
mV
mA
Symbol
Conditions
Min.
Typ.
Max.
Unit
UNDER-VOLTAGE LOCKOUT SECTION
V
TH(ST)
V
OPR(MIN)
3
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
