UC3842A, UC3843A, UC2842A, UC2843A
ELECTRICAL CHARACTERISTICS
(V
CC
= 15 V, [Note 2], R
T
= 10 k, C
T
= 3.3 nF, T
A
= T
low
to T
high
[Note 3],
unless otherwise noted.)
UC284XA
Characteristics
REFERENCE SECTION
Reference Output Voltage (I
O
= 1.0 mA, T
J
= 25°C)
Line Regulation (V
CC
= 12 V to 25 V)
Load Regulation (I
O
= 1.0 mA to 20 mA)
Temperature Stability
Total Output Variation over Line, Load, Temperature
Output Noise Voltage (f = 10 Hz to 10 kHz,
T
J
= 25°C)
Long Term Stability (T
A
= 125°C for 1000 Hours)
Output Short Circuit Current
OSCILLATOR SECTION
Frequency
T
J
= 25°C
T
A
= T
low
to T
high
Frequency Change with Voltage (V
CC
= 12 V to 25 V)
Frequency Change with Temperature
T
A
= T
low
to T
high
Oscillator Voltage Swing (Peak−to−Peak)
Discharge Current (V
osc
= 2.0 V)
T
J
= 25°C
T
A
= T
low
to T
high
ERROR AMPLIFIER SECTION
Voltage Feedback Input (V
O
= 2.5 V)
Input Bias Current (V
FB
= 2.7 V)
Open Loop Voltage Gain (V
O
= 2.0 V to 4.0 V)
Unity Gain Bandwidth (T
J
= 25°C)
Power Supply Rejection Ratio (V
CC
= 12 V to 25 V)
Output Current
Sink (V
O
= 1.1 V, V
FB
= 2.7 V)
Source (V
O
= 5.0 V, V
FB
= 2.3 V)
Output Voltage Swing
High State (R
L
= 15 k to ground, V
FB
= 2.3 V)
Low State (R
L
= 15 k to V
ref
, V
FB
= 2.7 V)
V
FB
I
IB
A
VOL
BW
PSRR
I
Sink
I
Source
V
OH
V
OL
2.45
−
65
0.7
60
2.0
−0.5
2.5
−0.1
90
1.0
70
12
−1.0
2.55
−1.0
−
−
−
−
−
2.42
−
65
0.7
60
2.0
−0.5
2.5
−0.1
90
1.0
70
12
−1.0
2.58
−2.0
−
−
−
−
−
V
5.0
−
6.2
0.8
−
1.1
5.0
−
6.2
0.8
−
1.1
V
mA
dB
MHz
dB
mA
f
osc
47
46
Df
osc/
D
V
Df
osc/
D
T
V
osc
I
dischg
7.5
7.2
8.4
−
9.3
9.5
7.5
7.2
8.4
−
9.3
9.5
−
−
−
52
−
0.2
5.0
1.6
57
60
1.0
−
−
47
46
−
−
−
52
−
0.2
5.0
1.6
57
60
1.0
−
−
%
%
V
mA
kHz
V
ref
Reg
line
Reg
load
T
S
V
ref
V
n
S
I
SC
4.95
−
−
−
4.9
−
−
− 30
5.0
2.0
3.0
0.2
−
50
5.0
− 85
5.05
20
25
−
5.1
−
−
− 180
4.9
−
−
−
4.82
−
−
− 30
5.0
2.0
3.0
0.2
−
50
5.0
− 85
5.1
20
25
−
5.18
−
−
− 180
V
mV
mV
mV/°C
V
mV
mV
mA
Symbol
Min
Typ
Max
Min
UC384XA
Typ
Max
Unit
2. Adjust V
CC
above the Startup threshold before setting to 15 V.
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
T
low
= 0°C for UC3842A, UC3843A
T
high
= +70°C for UC3842A, UC3843A
−25°C for UC2842A, UC2843A
+85°C for UC2842A, UC2843A
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