E-L4971 Datasheet, PDF (6/13 Pages) STMicroelectronics – 1.5A STEP DOWN SWITCHING REGULATOR

L4971
Figure 6. Quiescent drain current vs. input
voltage.
Iq
(mA)
5
4
200KHz
R₁=22K
C₂=1.2nF
D97IN724
100KHz
R₁=20K
C₂=2.7nF
3
0Hz
2
1
0
Tamb=25˚C
0% DC
5 10 15 20 25 30 35 40 45 50
Vcc(V)
Figure 7. Quiescent current vs. junction
temperature
Iq
(mA)
5
4
3
V_CC=35V
2
0% DC
D97IN731
200KHz
R₁=22K
C₂=1.2nF
100KHz
R₁=20K
C₂=2.7nF
0Hz
1
-50 -30 -10 10 30 50 70 90 110 Tj(˚C)
Figure 8. Stand-by drain current vs. input
voltage
Ibias
(µA)
150
Vss=GND
D97IN732
140
Tj=25˚C
130
120
110
100
Tj=125˚C
90
80
70
60
0 5 10 15 20 25 30 35 40 45 50 V_CC(V)
6/13
Figure 9. Line Regulation
V_O
(V)
3.377
3.376
D97IN733
Tj=125˚C
3.375
3.374
Tj=25˚C
3.373
3.372
3.371
3.370
0 5 10 15 20 25 30 35 40 45 50 V_CC(V)
Figure 10. Line Regulation
V_O
(V)
3.378
3.376
3.374
3.372
3.370
3.368
3.366
3.364
3.362
3.360
0
D97IN734
V_CC=35V
Tj=25˚C
Tj=125˚C
0.2 0.4 0.6 0.8 1.0 1.2 1.4 I_O(A)
Figure 11. Switching frquency vs. R1 and C2
fsw
(KHz)
500
200
100
50
20
10
5
0
D97IN784
Tamb=25˚C
0.82nF
1.2nF
2.2nF
3.3nF
4.7nF
5.6nF
20
40
60
80 R1(KΩ)