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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN557 датащи(PDF) 29 Page - STMicroelectronics |
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AN557 датащи(HTML) 29 Page - STMicroelectronics |
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29 / 52 page  29/52 AN557 APPLICATION NOTE Figure 36. Test and Evaluation Board Circuit. TYPICAL PERFORMANCES (using evaluation board) : n = 83% (Vi = 35V ; Vo = VREF ; Io = 3.5A ; fsw = 100KHz); Vo RIPPLE = 30mV (at 1A); Line regulation = 12mV (Vi = 15 to 50V); Load regulation = 7mV (Io = 0.5 to 3.5A); for component values Refer to the fig. 35 (Part list). PARTS LIST * 2 capacitors in parallel to increase input RMS current capability ** 3 capacitors in parallel to reduce total output ESR Table A Note: In the Test and Application Circuit for L4974D are not mounted C2, C14 and R8. Table B - SUGGESTED BOOTSTRAP CAPACITORS R1 = 30K Ω C3, C4, C5, C6 = 2.2 µF 50V R2 = 10K Ω C7 = 390pF Film R3 = 15K Ω C8 = 22nF MKT 1837 (ERO) R4 = 30K Ω C9 = 2.7nF KP1830 (ERO) R5 = 22 Ω C10 = 0.33 µF Film R6 = 4K7 C11 = 1nF R7 = see tab. A **C12, C13, C14 = 100 µF 40VL EKR (ROE) R8 = OPTION C15 = 1 µF Film * C1, C2 = 1000 µF 63V EYF (ROE) D1 = SB 560 (or equivalent) L1 = 150 µH core 58310 MAGNETICS 45 TURNS 0.91mm (AWG 16) COGEMA 949181 V0 R10 R8 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 |
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