L4973 STMicroelectronics, L4973 Datasheet - Page 9

• Manufacturer Part Number: L4973
• Description: 3.5A STEP DOWN SWITCHING REGULATOR
• Manufacturer: STMicroelectronics

Figure 10: Load Regulation (see fig. 1c)
Figure 12: Load Regulation (see fig. 1d)
Figure 14: Switching Frequency vs. Input Voltage
(KHz)
5.15
5.05
3.35
3.34
3.33
3.32
3.31
V
(V)
5.1
5.0
V
(V)
3.3
fsw
105
100
95
90
O
O
0
0
0
10
Tamb=25 C
1
1
V
V
CC
CC
20
= 35V
= 35V
30
2
2
Tj=25 C
40
Tj=125 C
Tj=25 C
3
3
50 V
Tj=125 C
D97IN640
D97IN661
D97IN631
CC
I
I
O
O
(A)
(A)
(V)
Figure 11: Line Regulation (see fig. 1d)
Figure 13: Switching Frequency vs.R2 and C7
Figure 15: Switching Frequency vs. Junction
L4973V3 - L4973V5 - L4973D3 - L4973D5
(KHz)
(KHz)
3.35
3.34
3.33
3.32
3.31
V
(V)
3.3
500
200
100
fsw
fsw
50
20
10
105
100
95
90
O
5
0
-50
0
(fig. 1)
temperature (see fig. 1)
10
20
0
20
40
30
50
60
I
O
40
= 1A
Tj=125 C
Tj=25 C
Tamb=25 C
100
80
50
D97IN660A
D97IN630
D97IN632
R2(K )
V
Tj( C)
CC
(V)
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