FAN8303 Просмотр технического описания (PDF) - ON Semiconductor
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FAN8303 Datasheet PDF : 13 Pages
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Typical Performance Characteristics (Continued)
VIN = 12 V, VOUT = 5 V, L1 = 15 μH, CIN = 10 μF, COUT = 22 μF, TA = +25oC, unless otherwise noted.
CH1
CH2
CH4
C
H
3
CH1(VO) : 2V, 20µ/div.
CH2(VIN) : 4V, 20µs/div.
CH3(SW) : 6V, 20µs/div.
CH4(IL) : 2A, 20µs/div.
Figure 10. Hard-Short at Output (OCP)
CH1
CH2
CH4
f=45kHz
△
f
=
4
5
k
C
H
H
z
3
CH1(VO) : 2V, 20µ/div.
CH2(VIN) : 4V, 20µs/div.
CH3(SW) : 6V, 20µs/div.
CH4(IL) : 2A, 20µs/div.
Figure 11. Overload at Output (OCP)
95
90
85
80
75
70
0
5.0Vo
3.3Vo
2.5Vo
1.8Vo
0.5
1
1.5
2
Load Current [A]
Figure 12. Efficiency Curve
1
0.5
0
-0.5
-1
-1.5
-40 -15 10
35
60
85
Temperature [℃]
Figure 13. Normalized Output Voltage vs.
Temperature
380
370
360
350
340
330
320
-40 -15
10
35
60
85
Temperature [℃]
4
3.5
3
2.5
2
0
20
40
60
80 100
Duty [%]
Figure 14. Oscillator Frequency vs. Temperature
Figure 15. Current Limited Level vs. Duty Ratio
© 2008 Fairchild Semiconductor Corporation
FAN8303 • Rev. 1.2
7
www.fairchildsemi.com
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