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LM2614BTL bảng dữ liệu(PDF) 9 Page - National Semiconductor (TI) |
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LM2614BTL bảng dữ liệu(HTML) 9 Page - National Semiconductor (TI) |
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9 / 16 page  Device Information (Continued) CIRCUIT OPERATION Referring to Figure 4, Figure 5, Figure 6 and Figure 7, the LM2614 operates as follows. During the first part of each switching cycle, the control block in the LM2614 turns on the internal PFET switch. This allows current to flow from the input through the inductor to the output filter capacitor and load. The inductor limits the current to a ramp with a slope of (V IN–VOUT)/L, by storing energy in a magnetic field. During the second part of each cycle, the controller turns the PFET switch off, blocking current flow from the input, and then turns the NFET synchronous rectifier on. In response, the inductor’s magnetic field collapses, generating a voltage that forces current from ground through the synchronous rectifier to the output filter capacitor and load. As the stored energy is transferred back into the circuit and depleted, the inductor current ramps down with a slope of V OUT/L. If the inductor current reaches zero before the next cycle, the synchronous rectifier is turned off to prevent current reversal. The output filter capacitor stores charge when the inductor current is high, and releases it when low, smoothing the voltage across the load. The output voltage is regulated by modulating the PFET switch on time to control the average current sent to the load. The effect is identical to sending a duty-cycle modulated rectangular wave formed by the switch and synchronous rectifier at SW to a low-pass filter formed by the inductor and output filter capacitor. The output voltage is equal to the average voltage at the SW pin. 20036706 FIGURE 4. Typical Operating Circuit 20036707 FIGURE 5. Simplified Functional Diagram www.national.com 9 |
Số phần tương tự - LM2614BTL |
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Mô tả tương tự - LM2614BTL |
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