L4970 datasheet(9/21 Pages) STMICROELECTRONICS

9 / 21 page

PARTS LIST

R1 = 30K

Ω

C1,C2 = 3300

µF 63VL EYF (ROE

R2 = 10K

Ω

C3,C4,C5,C6 = 2.2

µF

R3 = 15K

Ω

C7 = 390pF Film

R4 = 16K

Ω

C8 = 22nF MKT 1817 (ERO)

R5 =22

Ω 0,5W

R6 = 4K7

C9 = 2.2nF KP1830

R7 =10

Ω

C10 = 220nF MKT

R8 = see tab. A

C11 = 2.2nF MP1830

R9 = OPTION

**C12,C13,C14 = 220

µF 40VL EKR

R10 = 4K7

C15 =1

µF Film

R11 =10

Ω

D1 = MBR 1560CT (or 16A/60V or equivalent)

L1 = 40

µH

core 58071 MAGNETICS

27 TURNS Ø 1,3mm (AWG 16)

COGEMA 949178

* 2 capacitors in parallel to increase input RMS current capability

** 3 capacitors in parallel to reduce total output ESR

Table B

SUGGESTED BOOTSTRAP CAPACITORS

Operating Frequency

Bootstrap Cap.c10

f = 20KHz

≥680nF

f = 50KHz

≥470nF

f = 100KHz

≥330nF

f = 200KHz

≥220nF

f = 500KHz

≥100nF

Figure 6a: P.C. Board (components side) and Components Layout of Figure 5 (1:1 scale).

Table A

12V

15V

18V

24V

4.7k

Ω

4.7k

Ω

4.7k

Ω

4.7k

Ω

6.2kW

9.1k

Ω

12k

Ω

18k

Ω

L4970A

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