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LM2698MMX-ADJ 데이터시트(PDF) 8 Page - National Semiconductor (TI) |
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LM2698MMX-ADJ 데이터시트(HTML) 8 Page - National Semiconductor (TI) |
8 / 17 page Operation Continuous Conduction Mode The LM2698 is a current-mode, PWM boost regulator. A boost regulator steps the input voltage up to a higher output voltage. In continuous conduction mode (when the inductor current never reaches zero at steady state), the boost regu- lator operates in two cycles. In the first cycle of operation, shown in Figure 1 (a), the transistor is closed and the diode is reverse biased. Energy is collected in the inductor and the load current is supplied by C OUT. The second cycle is shown in Figure 1 (b). During this cycle, the transistor is open and the diode is forward biased. The energy stored in the inductor is transferred to the load and output capacitor. The ratio of these two cycles determines the output voltage. The output voltage is defined as: where D is the duty cycle of the switch. Inductor The inductor is one of the two energy storage elements in a boost converter. Figure 2 shows how the inductor current varies during a switching cycle. The current through an inductor is quantified as: 20012602 FIGURE 1. Simplified Boost Converter Diagram (a) First Cycle of Operation (b) Second Cycle Of Operation 20012605 FIGURE 2. (a) Inductor Current (b) Diode Current www.national.com 8 |
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