E-L4971 Datasheet, PDF (8/13 Pages) STMicroelectronics – 1.5A STEP DOWN SWITCHING REGULATOR

L4971
Figure 18. Efficiency vs. output current.
η
(%)
D97IN740
V_CC=8V
90
V_CC=12V
85
V_CC=24V
80
V_CC=48V
75
70
fsw=200KHz
V_O=5.1V
65
60
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 I_O(A)
Figure 19. Efficiency vs. output current.
η
(%)
D97IN741
90
V_CC=8V
85
V_CC=12V
80
V_CC=24V
75
70
V_CC=48V
65
fsw=200KHz
V_O=3.36V
60
55
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 I_O(A)
Figure 20. Efficiency vs. V_CC.
η
D97IN742
(%)
V_{0=5.1V-fSW=100KHz}
85
V_{0 =5.1V-fSW =200KHz}
80
75
I_O=1.5A
V
0
=3V.⁰_3=6V3.-3fS⁶_W^V=-2fS₀^W_0K=H1z00KHz
70
0
10 20 30 40 50 V_CC(V)
8/13
Figure 21. Power dissipation vs. Vcc.
Pdiss
(mW)
800
D97IN743
V_O=5.1V
fsw=100KHz
600
I_O=1.5A
I_O=1A
400
I_O=0.5A
200
0
0
10 20 30 40 50 V_CC(V)
Figure 22. Efficiency vs. V_O
Pdiss
(mW)
800
V_CC=35V
fsw=100KHz
D97IN744
I_O=1.5A
600
I_O=1A
400
I_O=0.5A
200
0
0
5 10 15 20 25 30 V₀(V)
Figure 23. Pulse by pulse limiting current vs.
junction temperature.
Ilim
D97IN747
(A)
fsw=100KHz
2.9
V_CC=35V
2.8
2.7
2.6
2.5
2.4
2.3
-50 -25 0 25 50 75 100 125 Tj(˚C)