UC3842A, UC3843A, UC2842A, UC2843A
100
80
60
40
20
1.2
1.0
0.8
0.6
0.4
0.2
0
0
V
V
= 15 V
= 2.0 V to 4.0 V
CC
V
= 15 V
CC
O
30
60
90
120
R = 100 K
L
T = 25°C
A
Gain
T = 25°C
A
T = 125°C
A
Phase
T = −55°C
A
0
150
180
−ꢀ20
10
100
1.0 k
10 k
100 k
1.0 M
10 M
0
2.0
4.0
6.0
8.0
f, FREQUENCY (Hz)
V , ERROR AMP OUTPUT VOLTAGE (V)
O
Figure 8. Error Amp Open Loop Gain and
Phase versus Frequency
Figure 9. Current Sense Input Threshold
versus Error Amp Output Voltage
0
−4.0
−8.0
−12
−16
−20
−24
110
90
V
= 15 V
CC
V
= 15 V
ꢃ
CC
R ≤ 0.1
L
70
T = 125°C
A
T = 55°C
A
T = 25°C
A
50
0
20
I
40
60
80
100
120
−55
−25
0
25
50
75
100
125
, REFERENCE SOURCE CURRENT (mA)
T , AMBIENT TEMPERATURE (°C)
ref
A
Figure 10. Reference Voltage Change
versus Source Current
Figure 11. Reference Short Circuit Current
versus Temperature
V
= 15 V
I = 1.0 mA to 20 mA
CC
V
= 12 V to 25 V
CC
O
T = 25°C
A
T = 25°C
A
2.0 ms/DIV
2.0 ms/DIV
Figure 13. Reference Line Regulation
Figure 12. Reference Load Regulation
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