UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
Figure 4:
Oscillator Discharge Current vs. Tem-
perature.
I
dischg
(mA)
D95IN335
Figure 5:
Error Amp Open-Loop Gain and
Phase vs. Frequency.
(dB)
80
D95IN337
φ
30
60
90
V
i
=15V
V
OSC
=2V
8.5
Gain
60
V
i
=15V
V
O
=2V to 4V
R
L
=100K
T
A
=25°C
8.0
40
Phase
20
120
150
180
f(Hz)
7.5
0
7.0
-55
-25
0
25
50
75
100 T
A
(°C)
-20
10
100
1K
10K
100K
1M
Figure 6:
Current Sense Input Threshold vs. Er-
ror Amp Output Voltage.
V
th
(V)
1.0
D95IN338
Figure 7:
Reference Voltage Change vs.
Source Current.
60
D95IN339
V
i
=15V
50
V
i
=15V
T
A
=25°C
0.8
40
T
A
=-40°C
T
A
=125°C
T
A
=125°C
0.6
0.4
30
20
T
A
=-40°C
0.2
0.0
10
0
0
2
4
6
V
O
(V)
0
20
40
60
T
A
=25°C
80
100 I
ref
(mA)
Figure 8:
Reference Short Circuit Current vs.
Temperature.
I
SC
(mA)
100
90
80
70
60
50
-55
-25
0
25
50
75
100 T
A
(°C)
V
i
=15V
R
L
≤0.1Ω
D95IN340
6/15
STMICROELECTRONICS [ STMICROELECTRONICS ]
