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LM3224 Fiches technique(PDF) 9 Page - Texas Instruments |
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LM3224 Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 26 page VIN COUT PWM L RLOAD V IN L C OUT R LOAD X V IN L C OUT R LOAD Cycle 1 Cycle 2 (a) (b) + V OUT - + V OUT - D 0 _ 10 _ 20 _ 30 _ 40 _ 50 _ 100 _ 0.1 1 _ 10 _ 100 _ 1000 _ LOAD CURRENT (mA) 60 _ 70 _ 80 _ 90 _ 10000 _ VOUT = 8V VIN = 4.2V VIN = 5.5V VIN = 2.7V VIN = 3.3V LM3224 www.ti.com SNVS277B – DECEMBER 2004 – REVISED SEPTEMBER 2005 Typical Performance Characteristics (continued) 1.25MHz Efficiency vs. Load Current Operation Figure 2. Simplified Boost Converter Diagram (a) First Cycle of Operation (b) Second Cycle Of Operation CONTINUOUS CONDUCTION MODE The LM3224 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 2 (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 2 (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: Copyright © 2004–2005, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM3224 |
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