L4971 STMicroelectronics, L4971 Datasheet - Page 6

• Manufacturer Part Number: L4971
• Description: IC REG SW 1.5A STEP DOWN 8-DIP
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L4971

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 3.3 ~ 50 V
• Current - Output: 1.5A
• Frequency - Switching: 100kHz ~ 300kHz
• Voltage - Input: 8 ~ 55 V
• Operating Temperature: 0°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Power - Output: 1W
• Output Voltage: 50 V
• Mounting Style: Through Hole
• For Use With: 497-4744 - BOARD EVAL FOR L4971/L4978 REG
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6697-5; E-L4971; E-L4971; L4971

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