L4972A-L4972AD
Figure 6a : Component Layout of fig.5 (1 : 1 scale). Evaluation Board Available (only for DIP version)
PART LIST
R1 = 30KΩ
R2 = 10KΩ
R3 = 15KΩ
R4 = 30KΩ
R5 = 22Ω
R6 = 4.7KΩ
R7 = see table A
R8 = OPTION
R9 = 4.7KΩ
* C1 = C2 = 1000µF 63V EYF (ROE)
C3 = C4 = C5 = C6 = 2,2µF 50V
C7 = 390pF Film
C8 = 22nF MKT 1837 (ERO)
C9 = 2.7nF KP 1830 (ERO)
C10 = 0.33µF Film
C11 = 1nF
** C12 = C13 = C14 = 100µF 40V EKR (ROE)
C15 = 1µF Film
D1 = SB 560 (OR EQUIVALENT)
L1 = 150µH
core 58310 MAGNETICS
45 TURNS 0.91mm (AWG 19)
COGEMA 949181
* 2 capacitors in parallel to increase input RMS current capability.
* * 3 capacitors in parallel to reduce total output ESR.
10/23
Table A
V0
12V
15V
18V
24V
R9
4.7kΩ
4.7kΩ
4.7kΩ
4.7kΩ
R7
6.2kW
9.1kΩ
12Ω
18Ω
Note:
In the Test and Application Circuit for L4972D are not
mounted C2, C14 and R8.
Table B
SUGGESTED BOOSTRAP CAPACITORS
Operatin g F requency
f = 20KHz
f = 50KHz
f = 100KHz
f = 200KHz
f = 500KHz
Boostrap Cap.c10
≥680nF
≥470nF
≥330nF
≥220nF
≥100nF