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CS1600-FSZ Folha de dados(PDF) 7 Page - Cirrus Logic |
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7 / 18 page CS1600 DS904A5 7 4. INTRODUCTION CS1600 is a digitally controlled Power Factor Correction (PFC) controller that operates in the Variable Frequency Discontinuous Conduction Mode (VF - DCM). The CS1600 uses a proprietary digital algorithm to optimize control of the power switch to deliver highly efficient performance for electronic ballast applications. With this control scheme, the total number of external components needed is minimized in comparison to conventional control techniques, thus reducing the overall system cost. Digital control is achieved by constantly monitoring two voltages – the PFC output voltage (Vlink) at pin FB and the rectified AC line voltage (Vrect) at pin IAC. This is done by measuring the currents that flow into the respective pins. These currents are then fed to the inputs of two analog-to-digital converters (ADCs) and are compared against an internal target current, Iref. The digital outputs of the two ADCs are then processed in a control algorithm which determines the behavior of the CS1600 during start-up, normal operation, and under fault conditions such as brownout, overvoltage, overcurrent, overpower, and over-temperature. Details of operation during these conditions are discussed in later sections of this document. Some of the key features of the CS1600 are as follows: • Discontinuous Conduction Mode with Continuously Variable Switching Frequency The PFC switching frequency is varied every switching cycle. This allows for a spread spectrum which minimizes the conducted EMI peaks at any given frequency, thereby minimizing the size and cost of the EMI filter required at the front-end. During start-up, the control algorithm limits the maximum ON time and adjusts the frequency to avoid inductor sat- uration and provides a near-trapezoidal envelope for the input current during every half cycle. During normal oper- ation, as the line voltage changes over half of a line cycle, the frequency varies approximately 2:1 as shown in Figure 7 below. Figure 7. Switching Frequency vs. Phase Angle Maximum power transfer occurs at the peak of the AC line voltage, at which time, the frequency reaches its maxi- mum value. Switching losses are minimized during peri- ods of low power transfer by switching at lower frequencies near the zero-crossing of the AC line. This switching frequency profile helps reduce total BOM cost through savings in the size of the boost inductor and the EMI filter components, while at the same time, im- proving overall system efficiency. • Integrated Feedback Control No external feedback compensation components are re- quired for the CS1600. The internal digital control engine self-compensates the feedback error signal using an adaptive control algorithm. • Protection Features The CS1600 provides various protection features such as undervoltage, overcurrent, overpower, open and short circuit protection and brownout. It also provides the user with the option of using the STBY pin to disable switching of the device. Rectified Line Voltage Phase (Deg.) 0 45 90 135 180 0 20 40 60 80 100 120 Line Voltage (% of Max) Switching Frequency (% of Max) |
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