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NCP1608 Datasheet(PDF) 11 Page - ON Semiconductor |
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NCP1608 Datasheet(HTML) 11 Page - ON Semiconductor |
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11 / 24 page  NCP1608 http://onsemi.com 11 high frequency switching converter to regulate the input current harmonics. Active circuits operate at a higher frequency, which enables them to be physically smaller, weigh less, and operate more efficiently than a passive circuit. With proper control of an active PFC stage, almost any complex load emulates a linear resistance, which significantly reduces the harmonic current content. Active PFC circuits are the most popular way to meet harmonic content requirements because of the aforementioned benefits. Generally, active PFC circuits consist of inserting a PFC pre−converter between the rectifier bridge and the bulk capacitor (Figure 26). Figure 26. Active PFC Pre−Converter with the NCP1608 Rectifiers + AC Line High Frequency Bypass Capacitor NCP1608 PFC Pre−Converter Converter Load + Bulk Storage Capacitor The boost (or step up) converter is the most popular topology for active power factor correction. With the proper control, it produces a constant voltage while consuming a sinusoidal current from the line. For medium power (<350 W) applications, CrM is the preferred control method. CrM occurs at the boundary between discontinuous conduction mode (DCM) and continuous conduction mode (CCM). In CrM, the driver on time begins when the boost inductor current reaches zero. CrM operation is an ideal choice for medium power PFC boost stages because it combines the reduced peak currents of CCM operation with the zero current switching of DCM operation. The operation and waveforms in a PFC boost converter are illustrated in Figure 27. Figure 27. Schematic and Waveforms of an Ideal CrM Boost Converter Diode Bridge AC Line + − L Diode Bridge AC Line + − L + The power switch is ON The power switch is OFF Critical Conduction Mode: Next current cycle starts when the core is reset. Inductor Current + With the power switch voltage being about zero, the input voltage is applied across the inductor. The inductor current linearly increases with a (Vin/L) slope. The inductor current flows through the diode. The inductor voltage is (Vout − Vin) and the inductor current linearly decays with a (Vout − Vin)/L slope. Vout (Vout − Vin)/L IL(peak) IL Vin Vdrain Vdrain Vin/L Vout Vin If next cycle does not start then Vdrain rings towards Vin + IL Vin Vdrain |
Similar Part No. - NCP1608_10 |
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Similar Description - NCP1608_10 |
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