L4970 STMicroelectronics, L4970 Datasheet - Page 9

• Manufacturer Part Number: L4970
• Description: 10A SWITCHING REGULATOR
• Manufacturer: STMicroelectronics

Figure 6a: P.C. Board (components side) and Components Layout of Figure 5 (1:1 scale).
PARTS LIST
* 2 capacitors in parallel to increase input RMS current capability
** 3 capacitors in parallel to reduce total output ESR
R
R
R
R
R
R
R
R
R
R
R
D1 = MBR 1560CT (or 16A/60V or equivalent)
L1 = 40 H
1
2
3
4
5
6
7
8
9
10
11
= 30K
= 10K
= 15K
= 16K
= 22
= 4K7
= 10
= see tab. A
= OPTION
= 4K7
= 10
0,5W
C
C
C
C
C
C
C
**C
C
core 58071 MAGNETICS
27 TURNS Ø 1,3mm (AWG 16)
COGEMA 949178
1
3
7
8
9
10
11
15
, C
, C
= 390pF Film
= 22nF MKT 1817 (ERO)
= 2.2nF KP1830
12
= 220nF MKT
= 2.2nF MP1830
= 1 F Film
, C
2
4
, C
= 3300 F 63V
13
5
, C
, C
14
6
= 2.2 F
= 220 F 40V
L
EYF (ROE
L
EKR
Table A
Table B
SUGGESTED BOOTSTRAP CAPACITORS
Operating Frequency
12V
15V
18V
24V
V
f = 100KHz
f = 200KHz
f = 500KHz
f = 20KHz
f = 50KHz
0
4.7k
4.7k
4.7k
4.7k
R
9
Bootstrap Cap.c10
680nF
470nF
330nF
220nF
100nF
6.2kW
9.1k
12k
18k
R
L4970A
7
9/21