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UC2845BD Datasheet(PDF) 6 Page - STMicroelectronics

Part # UC2845BD
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC2845BD Datasheet(HTML) 6 Page - STMicroelectronics

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-55
-25
0
25
50
75
100 TA(°C)
7.0
7.5
8.0
8.5
Idischg
(mA)
D95IN335
Vi=15V
VOSC=2V
Figure 4: Oscillator Discharge Current vs. Tem-
perature.
12
3
5
40
50
60
70
80
90
Dmax
(%)
0.8
RT(K
Ω)
D95IN336
Vi=15V
CT=3.3nF
TA=25°C
Idischg=7.5mA
Idischg=8.8mA
Figure 5: Maximum Output Duty Cycle vs. Tim-
ing Resistor.
10
100
1K
10K
100K
1M
f(Hz)
-20
0
20
40
60
80
(dB)
180
150
120
90
60
30
φ
D95IN337
Vi=15V
VO=2V to 4V
RL=100K
TA=25°C
Gain
Phase
Figure 6: Error Amp Open-Loop Gain and
Phase vs. Frequency.
02
46
VO(V)
0.0
0.2
0.4
0.6
0.8
1.0
Vth
(V)
D95IN338
Vi=15V
TA=-40°C
TA=125°C
TA=25°C
Figure 7: Current Sense Input Threshold vs. Er-
ror Amp Output Voltage.
0
2040
6080
100 Iref(mA)
D95IN339
0
10
20
30
40
50
60
Vi=15V
TA=-40°C
TA=125°C
Figure 8: Reference Voltage Change vs.
Source Current.
-55
-25
0
25
50
75
100 TA(°C)
D95IN340
50
60
70
80
90
100
ISC
(mA)
Vi=15V
RL≤0.1Ω
Figure 9: Reference Short Circuit Current vs.
Temperature.
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
6/15


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