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UC3844B Datasheet(PDF) 6 Page - ON Semiconductor

Part No. UC3844B
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3844B Datasheet(HTML) 6 Page - ON Semiconductor

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UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
6
−20
10 M
10
f, FREQUENCY (Hz)
Gain
Phase
0
30
60
90
120
150
180
100
1.0 k
10 k
100 k
1.0 M
0
20
40
60
80
100
0
VO, ERROR AMP OUTPUT VOLTAGE (VO)
0
0.2
0.4
0.6
0.8
1.0
1.2
2.0
4.0
6.0
8.0
TA = −55°C
VCC = 15 V
RL ≤ 0.1 W
Figure 6. Error Amp Open Loop Gain and
Phase versus Frequency
Figure 7. Current Sense Input Threshold
versus Error Amp Output Voltage
Figure 8. Reference Voltage Change
versus Source Current
Figure 9. Reference Short Circuit Current
versus Temperature
−16
0
Iref, REFERENCE SOURCE CURRENT (mA)
20
40
60
80
100
120
−12
−8.0
−4.0
0
50
−55
TA, AMBIENT TEMPERATURE (°C)
−25
0
25
50
75
100
125
70
90
110
−20
−24
TA = 125°C
VCC = 15 V
VO = 2.0 V to 4.0 V
RL = 100 k
TA = 25°C
VCC = 15 V
TA = 25°C
2.0 ms/DIV
2.0 ms/DIV
VCC = 12 V to 25 V
TA = 25°C
VCC = 15 V
IO = 1.0 mA to 20 mA
TA = 25°C
Figure 10. Reference Load Regulation
Figure 11. Reference Line Regulation
VCC = 15 V
TA = 125°C
TA = 25°C
TA = −55°C


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