L4972AD datasheet(10/23 Pages) STMICROELECTRONICS

10 / 23 page

PART LIST

R1 = 30K

Ω

R2 = 10K

Ω

R3 = 15K

Ω

R4 = 30K

Ω

R5 =22

Ω

R6 = 4.7K

Ω

R7 = see table A

R8 = OPTION

R9 = 4.7K

Ω

*C1 =C2 = 1000

µF 63V EYF (ROE)

C3 =C4 =C5 =C6 = 2,2

µF 50V

C7 = 390pF Film

C8 = 22nF MKT 1837 (ERO)

C9 = 2.7nF KP 1830 (ERO)

C10 = 0.33

µF Film

C11 = 1nF

** C12 =C13 =C14 = 100

µF 40V EKR (ROE)

C15 =1

µF Film

D1 = SB 560 (OR EQUIVALENT)

L1 = 150

µH

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.

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

Boo strap Cap.c10

f = 20KHz

≥680nF

f = 50KHz

≥470nF

f = 100KHz

≥330nF

f = 200KHz

≥220nF

f = 500KHz

≥100nF

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

Table A

12V

15V

18V

24V

4.7k

Ω

4.7k

Ω

4.7k

Ω

4.7k

Ω

6.2kW

9.1k

Ω

L4972A-L4972AD

10/23

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