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L4990 数据表(PDF) 6 Page - STMicroelectronics

部件名 L4990
功能描述  PRIMARY CONTROLLER
PDF  24 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4990 数据表(HTML) 6 Page - STMicroelectronics

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8
1012
1416182022
24
7.0
7.5
8.0
8.5
9.0
Vcc
[V]
Iq [m A ]
V14 = 0, V5 = Vr ef
Rt = 4.5Kohm,Tj = 25
°C
500K h z
300K h z
1M h z
100Khz
Figure 3. Quiescent current vs. input voltage.
-50
-25
0
25
50
75
100
125
150
4.9
4.95
5
5.05
5.1
Tj (
°C)
Vref [V])
Vcc = 15V
Iref = 1mA
Figure 7. Vref vs. junction temperature.
-50
-25
0
25
50
75
100
125
150
4.9
4.95
5
5.05
5.1
Tj (
°C)
Vref [V]
Vcc = 15V
Iref= 20mA
Figure 8. Vref vs. junction temperature.
8
10121416182022
0
6
12
18
24
30
36
Vcc [V]
Iq [mA]
Co = 1nF, Tj = 25
°C
DC = 1 00%
1M H z
50 0KH z
300KH z
10 0KH z
Figure 5. Quiescent current vs. input voltage
and switching frequency.
0
5
10
15
20
25
4.9
4.95
5
5.05
5.1
Iref [mA]
Vref [V]
Vcc=15V
Tj = 25
°C
Figure 6. Reference voltage vs. load current.
8
10121416
1 8
20
22
0
6
12
18
24
30
36
Vc c [V]
Iq [mA ]
C o = 1nF, Tj = 25
°C
DC = 0 %
1M Hz
500K Hz
300K Hz
100KHz
Figure 4. Quiescent current vs. input voltage
and switching frequency.
L4990 - L4990A
6/24



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