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L4978D 数据表(PDF) 8 Page - STMicroelectronics

部件名 L4978D
功能描述  2A STEP DOWN SWITCHING REGULATOR
PDF  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4978D 数据表(HTML) 8 Page - STMicroelectronics

Back Button L4978D Datasheet HTML 4Page - STMicroelectronics L4978D Datasheet HTML 5Page - STMicroelectronics L4978D Datasheet HTML 6Page - STMicroelectronics L4978D Datasheet HTML 7Page - STMicroelectronics L4978D Datasheet HTML 8Page - STMicroelectronics L4978D Datasheet HTML 9Page - STMicroelectronics L4978D Datasheet HTML 10Page - STMicroelectronics L4978D Datasheet HTML 11Page - STMicroelectronics L4978D Datasheet HTML 12Page - STMicroelectronics  
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background image
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4 IO(A)
60
65
70
75
80
85
90
η
(%)
D97IN740
VCC=8V
fsw=200KHz
VO=5.1V
VCC=12V
VCC=24V
VCC=48V
Figure 15. Efficiencyvs. output current.
0.0 0.2
0.4
0.6
0.8
1.0
1.2 1.4 IO(A)
55
60
65
70
75
80
85
90
η
(%)
D97IN741
VCC=8V
fsw=200KHz
VO=3.36V
VCC=12V
VCC=24V
VCC=48V
Figure 16. Efficiency vs. output current.
Io=2A
0
102030
40
5060
70
75
80
85
90
Vcc [V]
n [%]
Vo=5.1V fsw=100kHz
Vo=5.1V fsw=200kHz
Vo=3.36V fsw=100kHz
Vo=3.36V fsw=200kHz
Figure 17. Efficiencyvs. Vcc.
Io=0.5A
Io=2A
Io=1A
0
1020304050
60
0
200
400
600
800
1000
Vcc [V]
Pdiss [mW]
Io=1.5A
Vo=5.1V
fsw=100kHz
Figure 18. Power dissipation vs. Vcc.
Io=2A
Io=1A
0
102030
0
200
400
600
800
1000
1200
1400
Vo [V]
Pdiss [mW]
Io=0.5A
Io=1.5A
Vcc=35V
fsw=100kHz
Figure 19. Device Power dissipation vs.Vo
-50 -25
0
25
50
75
100 125 Tj(
°C)
2.3
2.4
2.5
2.6
2.7
2.8
2.9
Ilim
(A)
D97IN747
fsw=100KHz
VCC=35V
Figure 20. Pulse by pulse limiting current vs.
junction temperature.
L4978
8/12



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