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LM2700 Folha de dados(PDF) 8 Page - Texas Instruments |
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LM2700 Folha de dados(HTML) 8 Page - Texas Instruments |
8 / 25 page VOUT = VIN 1-D , D' = (1-D) = VIN VOUT LM2700 SNVS152B – MAY 2004 – REVISED MAY 2004 www.ti.com Typical Performance Characteristics (continued) Frequency Frequency vs. vs. VIN VIN (600 kHz) (1.25 MHz) Operation Figure 3. Simplified Boost Converter Diagram (a) First Cycle of Operation (b) Second Cycle Of Operation CONTINUOUS CONDUCTION MODE The LM2700 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 regulator operates in two cycles. In the first cycle of operation, shown in Figure 3 (a), the transistor is closed and the diode is reverse biased. Energy is collected in the inductor and the load current is supplied by COUT. The second cycle is shown in Figure 3 (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 approximately as: (1) where D is the duty cycle of the switch, D and D ′ will be required for design calculations. 8 Submit Documentation Feedback Copyright © 2004, Texas Instruments Incorporated Product Folder Links: LM2700 |
Nº de peça semelhante - LM2700_14 |
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Descrição semelhante - LM2700_14 |
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