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