L4990 Просмотр технического описания (PDF) - STMicroelectronics
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производитель
L4990 Datasheet PDF : 24 Pages
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Figure 9. Vref SVRR vs. switching frequency.
SVRR (dB)
120
Vcc=15V
Vp-p=1V
80
40
L4990 - L4990A
Figure 10. Output saturation.
V sat = V10 [V]
16
14
Vcc = 15V
Tj = 25°C
12
10
8
0
1
10
100
1000
fsw (Hz)
Figure 11. Output saturation.
Vsat = V10 [V ]
2.5
10000
2
Vcc = 15V
Tj = 25°C
1.5
60
0.2 0.4 0.6 0.8
1
1.2
Isourc e [A]
Figure 12. UVLO Saturation
Ipin10 [mA]
50
40
Vcc < Vccon
before turn-on
30
1
20
0.5
10
00
0.2 0.4 0.6 0.8
1
1 .2
Is ink [A]
Figure13. Timingresistorvs.switchingfrequency.
0
0 200 400 600 800 1,000 1,200 1,400
Vpin10 [mV]
Figure 14. Switching frequency vs. temperature.
fsw(KHz)
5000
2000
1000
500
200
100
50
20
10
Vcc =15V, V15 =0V
Tj= 25°C
5.6nF
2.2nF
100pF
220pF
470pF
1nF
10
20
30
40
Rt (kohm)
fsw (KHz)
320
310
300
Rt= 4.5Kohm, Ct = 1nF
Vcc = 15V, V15=Vref
290
280
-50 -25 0 25 50 75 100 125 150
Tj (°C)
7/24
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