L4974 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

L4974

3.5A SWITCHING REGULATOR

STMicroelectronics 

L4974A

Figure 6a : Component Layout of fig.5 (1 : 1 scale). Evaluation Board Available

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.

10/22

Table A

V0

12V

15V

18V

24V

R9

4.7kΩ

4.7kΩ

4.7kΩ

4.7kΩ

R7

6.2kW

9.1kΩ

12Ω

18Ω

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

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