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L4973D5 Datasheet(PDF) 11 Page - STMicroelectronics

Part # L4973D5
Description  3.5A STEP DOWN SWITCHING REGULATOR
Download  16 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4973D5 Datasheet(HTML) 11 Page - STMicroelectronics

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01
23
IO(A)
0.5
1.5
2.5
3.5
70
75
85
η
(%)
80
90
D97IN662
Vcc=48V
Vcc=12V
Vcc=24V
VO = 3.3V
fsw = 200KHz
Figure 22: Efficiency vs. Output Current
(see fig.1d)
0
10
30
40
Vcc(V)
20
50
0
0.5
1.0
1.5
Pdiss
(W)
D97IN647A
IO=3.5A
IO=3A
IO=2A
IO=2.5A
VO = 5.1V
fsw = 100KHz
Figure 23: Power dissipation vs. Input Voltage
(Device only) (see fig.1c)
0
5
15
20
VO(V)
10
25
30
0
0.5
1.0
1.5
Pdiss
(W)
2.0
2.5
3.0
D97IN648
IO=3.5A
IO=3A
IO=1A
IO=2A
IO=2.5A
VCC = 35V
fsw = 100KHz
Figure 24: Power dissipation vs. Output Voltage
(Device only)
-40 -20
60 80
Tj(
°C)
0
120
20 40
100
4.2
4.4
4.6
4.8
Ilim
(A)
5
5.2
D97IN652
Vcc=35
Figure 25: Pulse by Pulse Limiting Current vs.
Junction Temperature
1
2
IO
(A)
3
2
1
VO
(mV)
100
0
-100
D97IN649
T
T
200
µs/DIV
VCC = 35V
fsw = 100KHz
Figure 26: Load Transient
2
1
D97IN650
VCC
(V)
30
20
10
VO
(mV)
100
0
-100
1ms/DIV
IO = 1A
fsw = 100KHz
Figure 27: Line Transient
L4973V3 - L4973V5 - L4973D3 - L4973D5
11/16


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