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CS1600-FSZ датащи(PDF) 8 Page - Cirrus Logic |
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CS1600-FSZ датащи(HTML) 8 Page - Cirrus Logic |
8 / 18 page CS1600 8 DS904A6 4.1 PFC Implementation The PFC switching frequency profile over the line period has been discussed in detail in Section 4. In addition, the digital control algorithm tracks changes the AC input and operates in different frequency bands at different line voltages as illustrated in Figure 8 and Figure 9 below. Figure 8. Switching Frequency vs. Output Power Vin < 165 VAC Figure 9. Switching Frequency vs. Output Power Vin > 165 VAC The CS1600 primarily operates in the DCM mode with a properly sized inductor. However, it will move into a quasi- CRM mode near the peaks of the input line, in order to enable maximum power delivery, as illustrated in Figure 10 below. Figure 10. DCM and quasi-CRM Operation with CS1600 4.1.1 Start-up Mode vs. Normal Mode CS1600 operates in two discrete states: Start-up mode: When the output voltage of the PFC stage, Vlink, is <90% of its nominal value, the device operates in the start-up mode. It continues operating in this mode till the nominal Vlink voltage is reached. The start-up algorithm provides an ON time which is varied in proportion to the sensed rectified voltage, while changing the switching frequency to provide maximum power. During this start-up phase of operation, the switching frequency could be significantly lower than the normal operating frequency, and the input current waveform is forced into following a trapezoidal envelope in phase with the line voltage, to maximize energy transfer. The ON time and the switching frequency of the IC ensure that peak currents are kept controlled to prevent saturation of the boost inductor during this period. Normal mode: Once Vlink reaches its nominal value, the chip operates in the normal mode. Here, the frequency follows the profile shown in Figure 7, and the ON time is varied to achieve PFC. Any drop in Vlink to below its undervoltage threshold, as defined in Section 2.2. Electrical Characteristics re-triggers the start-up mode of operation. A simplified illustration of operation in these two modes is shown below in Figure 11. Figure 11. Start-up and Normal Modes PO [W] fSW [kHz] Max fSW 50% 100 100% 5% Burst Mode 70 35 Min fSW PO [W] fSW [kHz] Max fSW 50% 60 100% 5% Burst Mode 48 24 Min fSW DCM Quasi CRM DCM Quasi CRM DCM ILB t [ms] 100% 90% Normal Mode Normal Mode |
Аналогичный номер детали - CS1600-FSZ |
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Аналогичное описание - CS1600-FSZ |
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