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LM2611BMFX 数据表(PDF) 6 Page - National Semiconductor (TI) |
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LM2611BMFX 数据表(HTML) 6 Page - National Semiconductor (TI) |
6 / 15 page Operation Cuk Converter The LM2611 is a current mode, fixed frequency PWM switching regulator with a −1.23V reference that makes it ideal for use in a Cuk converter. The Cuk converter inverts the input and can step up or step down the absolute value. Using inductors on both the input and output, the Cuk con- verter produces very little input and output current ripple. This is a significant advantage over other inverting topolo- gies such as the buck-boost and flyback. The operating states of the Cuk converter are shown in Figure 1. During the first cycle, the transistor switch is closed and the diode is open. L1 is charged by the source and L2 is charged by C CUK, while the output current is provided by L2. In the second cycle, L1 charges C CUK and L2 discharges through the load. By applying the volt-second balance to either of the inductors, the relationship of V OUT to the duty cycle (D) is found to be: The following sections review the steady-state design of the LM2611 Cuk converter. Output and Input Inductor Figure 2 and Figure 3 show the steady-state voltage and current waveforms for L1 and L2, respectively. Referring to Figure 1 (a), when the switch is closed, V IN is applied across L1. In the next cycle, the switch opens and the diode be- comes forward biased, and V OUT is applied across L1 (the voltage across C CUK is VIN −VOUT. The voltage and current waveforms of inductor L2 are shown in Figure 3. During the first cycle of operation, when the switch is closed, V IN is applied across L2. When the switch opens, V OUT is applied across L2. 20018105 FIGURE 1. Operating Cycles of a Cuk Converter 20018103 FIGURE 2. Voltage and Current Waveforms in Inductor L1 of a Cuk Converter 20018104 FIGURE 3. Voltage and Current Waveforms in Inductor L2 of a Cuk Converter www.national.com 6 |
类似零件编号 - LM2611BMFX |
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类似说明 - LM2611BMFX |
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