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AN1376 датащи(PDF) 11 Page - STMicroelectronics |
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AN1376 датащи(HTML) 11 Page - STMicroelectronics |
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11 / 35 page ![]() 11/35 AN1376 APPLICATION NOTE Figure 8. The low frequency residual ripple compared with the ripple across C10 (input Elcap) shows an excellent rejection of the circuit (>80 dB). 6 MEASUREMENT OF THE RMS CAPACITOR CURRENTS The tables show the rms currents flowing in the output capacitors at 115Vac and 220Vac, full load. All the rms currents are within the rating of the capacitor type indicated (Rubycon, YXF series). This avoids the component overstress that should affect the reliability and/or the ex- pected lifetime of the SMPS . @ 115Vac: ICAP C1 = 1.02 ARMS @ 115Vac: ICAP C3 = 1.78 ARMS @ 115Vac: ICAP C19 = 1.15 ARMS @ 115Vac: ICAP C18 = 140 mARMS @ 220Vac: ICAP C1 = 0.7 ARMS @ 220Vac: ICAP C1 = 1.4 ARMS @ 220Vac: ICAP C19 = 0.92 ARMS @ 220Vac: ICAP C18 = 130 mARMS @115 VAC - 50Hz - LINE FREQUENCY RIPPLE CH1: VC10 CH2: +30 Vout CH2: +7 Vout CH3: +5 Vout CH3: +3.3 Vout CH4: +12 Vout |
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