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L4972A

PART LIST

R1 = 30K

Ω

R2 = 10K

Ω

R3 = 15K

Ω

R4 = 30K

Ω

R5 = 22

Ω

R6 = 4.7K

Ω

R7 = see table 6

R8 = OPTION

R9 = 4.7K

Ω

* C1 = C2 = 1000mF 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 = STPS5L60

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.

Table 6.

Note:

In the Test and Application Circuit for L4972D are not

mounted C2, C14 and R8.

Table 7. Suggested Boostrap Capacitors

12V

4.7k

Ω

6.2k

Ω

15V

4.7k

Ω

9.1k

Ω

18V

4.7k

Ω

12

Ω

24V

4.7k

Ω

18

Ω

Operating Frequency

Boostrap Cap.c10

f = 20KHz

≥680nF

f = 50KHz

≥470nF

f = 100KHz

≥330nF

f = 200KHz

≥220nF

f = 500KHz

≥100nF