L4973D3 STMICROELECTRONICS [STMicroelectronics], L4973D3 Datasheet - Page 10
L4973D3
Manufacturer Part Number
L4973D3
Description
3.5A STEP DOWN SWITCHING REGULATOR
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.L4973D3.pdf
(16 pages)
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L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1
Figure 16: Dropout Voltage Between pin 7,8 and
Figure 18: Efficiency vs. Output Voltage
Figure 20: Efficiency vs. Output Current
10/16
0.6
0.4
0.2
(V)
(%)
(%)
98
96
94
92
90
88
86
90
85
80
75
0
V
0
0
0
(see fig.1c)
5
2,3
(Diode STPS745D)
Vcc=24V
1
1
10
Vcc=48V
100KHz
15
200KHz
Vcc=12V
2
2
20
Tj=125 C
V
f
I
V
sw
O
25
O
CC
= 3A
= 200KHz
= 5.1V
Tj=0 C
3
= 35V
3
30
D97IN642
D97IN643
D97IN646
V
I
I
O
O
O
(A)
(V)
(A)
Figure 17: Efficiency vs. Output Voltage
Figure 19: Efficiency vs. Output Current
Figure 21: Efficiency vs. Output Current
(%)
(%)
(%)
98
96
94
92
90
88
86
95
90
85
80
90
85
80
75
0
0
0
(see fig.1)
( see fig.1c)
(see fig.1d)
Vcc=24V
10
1
1
Vcc=24V
Vcc=12V
Vcc=48V
100KHz
200KHz
Vcc=12V
20
Vcc=48V
2
2
30
V
f
V
f
sw
sw
O
I
V
O
O
= 100KHz
CC
= 100KHz
= 3.3V
= 5.1V
= 3A
3
3
= 50V
D97IN641
D97IN645
D97IN644
40
V
I
I
O
O
O
(V)
(A)
(A)