L4990 Просмотр технического описания (PDF) - STMicroelectronics
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производитель
L4990 Datasheet PDF : 24 Pages
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L4990 - L4990A
Figure 15. Switching frequency vs. temperature.
Figure 16. Dead time vs Ct.
fsw (KHz)
320
310
Rt= 4.5Kohm, Ct = 1nF
Vcc = 15V, V15= 0
Dead time [ns]
1,500
Rt =4.5Kohm
1,200
V15 = 0V
300
290
280
-50 -25 0
25 50 75 100 125 150
Tj (°C)
Figure 17. Maximum Duty Cycle vs Vpin3.
DC Control Voltage V pin3 [V]
3.5
V15 = Vref
3
V15 = 0V
2.5
2
Rt = 4.5Kohm ,
1.5
Ct = 1nF
1
0 10 20 30 40 50 60 70 80 90 100
Duty C y cle [% ]
Figure 19. E/A frequency response.
900
V15 = Vref
600
300
2
4
6
8
10
Timing capacitor Ct [nF]
Figure18.Delayto outputvs junctiontemperature.
Delay to output (ns)
130
120
110
100
90
80
PIN10 = OPEN
1V pulse
on PIN13
70
60
-50 -25 0
25 50 75
Tj (°C)
100 125 150
G [dB]
150
Phase
140
120
100
100
80
50
60
0
40
20
0.01 0.1
1
10 100 1000 10000 100000
f (KHz)
8/24
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