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| E-UC3843BD1 Datasheet, PDF (6/15 Pages) STMicroelectronics – HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER | |||
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UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
Figure 4: Oscillator Discharge Current vs. Tem-
perature.
Idischg
(mA)
8.5
D95IN335
Vi=15V
VOSC=2V
8.0
7.5
7.0
-55 -25 0 25 50 75 100 TA(ËC)
Figure 6: Error Amp Open-Loop Gain and
Phase vs. Frequency.
(dB)
D95IN337 Ï
Vi=15V
80
VO=2V to 4V 30
Gain
RL=100K
TA=25ËC
60
60
40
90
Phase
20
120
0
150
-20
180
10 100 1K 10K 100K 1M f(Hz)
Figure 8: Reference Voltage Change vs.
Source Current.
D95IN339
60
Vi=15V
50
40
TA=-40ËC
TA=125ËC
30
20
10
0
0
6/15
20 40 60 80 100 Iref(mA)
Figure 5: Maximum Output Duty Cycle vs. Tim-
ing Resistor.
Dmax
(%)
D95IN336
90
Idischg=7.5mA
80
Idischg=8.8mA
70
60
Vi=15V
CT=3.3nF
50
TA=25ËC
40
0.8 1
2
3
5
RT(Kâ¦)
Figure 7: Current Sense Input Threshold vs. Er-
ror Amp Output Voltage.
Vth
(V)
Vi=15V
D95IN338
1.0
TA=25ËC
0.8
TA=125ËC
0.6
0.4
TA=-40ËC
0.2
0.0
0
2
4
6
VO(V)
Figure 9: Reference Short Circuit Current vs.
Temperature.
ISC
(mA)
100
D95IN340
Vi=15V
RLâ¤0.1â¦
90
80
70
60
50
-55 -25 0 25 50 75 100 TA(ËC)
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