AN557 datasheet(25/52 Pages) STMICROELECTRONICS

Nome de Peças	AN557

Descrição Electrónicos	EASY APPLICATION DESIGN WITH THE L4970A

PDF	52 Pages

Scroll/Zoom	100%

Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

Logo

25 / 52 page

25/52

AN557 APPLICATION NOTE

PARTS LIST

* 2 capacitors in parallel to increase input RMS current capability

** 3 capacitors in parallel to reduce total output ESR

Table A

Table B

SUGGESTED BOOTSTRAP CAPACITORS

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

R10

12V

4.7K

Ω

6.2K

Ω

15V

4.7K

Ω

9.1K

Ω

18V

4.7K

Ω

12K

Ω

24V

4.7K

Ω

18K

Ω

Operating Frequency

Bootstrap Cap.c10

f = 20KHz

≥680nF

f = 50KHz

≥470nF

f = 100KHz

≥330nF

f = 200KHz

≥220nF

f = 500KHz

≥100nF

AN557 Folha de dados(PDF) 25 Page - STMicroelectronics

AN557 Folha de dados(HTML) 25 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

Folha de dados Download

Ligação URL