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L4976D Datasheet(PDF) 5 Page - STMicroelectronics

Part # L4976D
Description  1A STEP DOWN SWITCHING REGULATOR
Download  11 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4976D Datasheet(HTML) 5 Page - STMicroelectronics

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0
5 10 15 20 25 30 35 40 45 50
Vcc(V)
1
2
3
4
5
Iq
(mA)
200KHz
R1=22K
C2=1.2nF
0Hz
D97IN724
Tamb=25
°C
0% DC
100KHz
R1=20K
C2=2.7nF
Figure 1. Quiescent drain current vs. input
voltage.
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4 IO(A)
3.360
3.362
3.364
3.366
3.368
3.370
3.372
3.374
3.376
3.378
VO
(V)
Tj=25
°C
Tj=125
°C
VCC=35V
D97IN734
Figure 4. Load regulation
-50 -30 -10 10 30 50 70 90 110
Tj(
°C)
1
2
3
4
5
Iq
(mA)
D97IN731
0Hz
200KHz
R1=22K
C2=1.2nF
VCC=35V
0% DC
100KHz
R1=20K
C2=2.7nF
Figure 2. Quiescent current vs. junction
temperature
0
20
40
60
80
R1(K
Ω)
5
10
20
50
100
200
500
fsw
(KHz)
D97IN784
0.82nF
1.2nF
2.2nF
3.3nF
4.7nF
5.6nF
Tamb=25
°C
Figure 5. Switching frquency vs. R1 and C2
0
5 10 15 20 25 30 35 40 45 50 VCC(V)
3.370
3.371
3.372
3.373
3.374
3.375
3.376
3.377
VO
(V)
D97IN733
Tj=25
°C
Tj=125
°C
Figure 3. Line Regulation
0
5 10 15 20 25 30 35 40 45 50 VCC(V)
90.0
92.5
95.0
97.5
100.0
102.5
105.0
107.5
fsw
(KHz)
D97IN735
Tj=25
°C
Figure 6. Switching Frequency vs. input
voltage.
L4976
5/11


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