L4990D Просмотр технического описания (PDF) - STMicroelectronics
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производитель
L4990D Datasheet PDF : 24 Pages
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L4990 - L4990A
Figure 3. Quiescent current vs. input voltage.
Iq [mA]
9.0
V 14 = 0, V5 = Vref
Rt = 4.5Kohm,Tj = 25°C
8.5
1M hz
500Khz
300K hz
8.0
100Khz
7.5
7.0
8
10 12 14 16 18 20 22 24
Vcc [V]
Figure 5. Quiescent current vs. input voltage
and switching frequency.
Iq [mA]
36
Co = 1nF, Tj = 25°C
30
DC = 100%
24
1M H z
18
50 0KH z
3 00KH z
12
10 0KH z
6
0
8
10 12 14 16 18 20 22
Vcc [V]
Figure 7. Vref vs. junction temperature.
Figure 4. Quiescent current vs. input voltage
and switching frequency.
Iq [mA]
36
30
C o = 1nF, Tj = 25°C
DC = 0%
24
18
12
6
1M Hz
500K Hz
300K Hz
100KHz
0
8
10
12
14
16
18
20
22
Vcc [V]
Figure 6. Reference voltage vs. load current.
Vref [V]
5.1
5.05
5
Vcc=15V
Tj = 25°C
4.95
4.9
0
5
10
15
20
25
Iref [mA]
Figure 8. Vref vs. junction temperature.
Vref [V])
5.1
5.05
5
Vcc = 15V
Iref = 1mA
Vref [V]
5 .1
5.05
5
Vcc = 15V
Iref= 20mA
4.95
4.95
4.9
-50 -25 0
25 50 75
Tj (°C)
100 125 150
6/24
4 .9
-50 -25 0 25 50 75 100 125 150
Tj (°C)
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