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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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P1012AP13 датащи(PDF) 13 Page - ON Semiconductor |
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P1012AP13 датащи(HTML) 13 Page - ON Semiconductor |
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13 / 25 page  NCP1010, NCP1011, NCP1012, NCP1013, NCP1014 www.onsemi.com 13 Figure 22. Low Peak Current Skip−Cycle Guarantees Noise−Free Operation 100% Peak current at nominal power 25% Skip−cycle current limit Full power operation involves the nominal switching frequency and thus avoids any noise when running. Experiments carried on a 5.0 W universal mains board unveiled a standby power of 300 mW @ 230 Vac with the DSS activated and dropped to less than 100 mW when an auxiliary winding is connected. Frequency Jittering for Improved EMI Signature By sweeping the switching frequency around its nominal value, it spreads the energy content on adjacent frequencies rather than keeping it centered in one single ray. This offers the benefit to artificially reduce the measurement noise on a standard EMI receiver and pass the tests more easily. The EMI sweep is implemented by routing the VCC ripple (induced by the DSS activity) to the internal oscillator. As a result, the switching frequency moves up and down to the DSS rhythm. Typical deviation is "3.3% of the nominal frequency. With a 1.0 V peak−to−peak ripple, the frequency will equal 65 kHz in the middle of the ripple and will increase as VCC rises or decrease as VCC ramps down. Figure 23 portrays the behavior we have adopted. Figure 23. The VCC ripple is used to introduce a frequency jittering on the internal oscillator sawtooth. Here, a 65 kHz version was selected. VCC Ripple VCCOFF 67.15 kHz 65 kHz 62.85 kHz VCCON Internal Sawtooth |
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