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LM2731XMF_NOPB датащи(PDF) 14 Page - Texas Instruments |
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LM2731XMF_NOPB датащи(HTML) 14 Page - Texas Instruments |
14 / 16 page 2 3 4 5 6 7 8 VIN (V) 0 200 400 600 800 1000 1200 V OUT = 5V V OUT = 8V V OUT = 10V V OUT = 12V VIN (V) 0 200 400 600 800 1000 1200 2 3 4 5 6 7 8 9 10 11 V OUT = 5V V OUT = 8V V OUT = 10V V OUT = 12V V OUT = 18V ILOAD(max) = (1 - DC) x (ISW(max) - DC (VIN - VSW)) 2fL TI Confidential - NDA Restrictions LM2731 SNVS217F – MAY 2004 – REVISED NOVEMBER 2012 www.ti.com CALCULATING LOAD CURRENT As shown in the figure which depicts inductor current, the load current is related to the average inductor current by the relation: ILOAD = IIND(AVG) x (1 - DC) (7) Where "DC" is the duty cycle of the application. The switch current can be found by: ISW = IIND(AVG) + ½ (IRIPPLE) (8) Inductor ripple current is dependent on inductance, duty cycle, input voltage and frequency: IRIPPLE = DC x (VIN-VSW) / (f x L) (9) combining all terms, we can develop an expression which allows the maximum available load current to be calculated: (10) The equation shown to calculate maximum load current takes into account the losses in the inductor or turn-OFF switching losses of the FET and diode. For actual load current in typical applications, we took bench data for various input and output voltages for both the "X" and "Y" versions of the LM2731 and displayed the maximum load current available for a typical device in graph form: Figure 33. Max. Load Current (typ) vs VIN - "X" Figure 34. Max. Load Current (typ) vs VIN - "Y" 14 Submit Documentation Feedback Copyright © 2004–2012, Texas Instruments Incorporated Product Folder Links: LM2731 |
Аналогичный номер детали - LM2731XMF_NOPB |
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Аналогичное описание - LM2731XMF_NOPB |
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