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LM27313XMFX bảng dữ liệu(PDF) 10 Page - Texas Instruments |
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LM27313XMFX bảng dữ liệu(HTML) 10 Page - Texas Instruments |
10 / 20 page ILOAD(max) = (1 - DC) x (ISW(max) - DC (VIN - VSW)) 2fL 0 20 40 60 80 100 0 200 400 600 800 1000 1200 1400 1600 DUTY CYCLE (%) = [1 - EFF*(VIN/VOUT))] VIN = 5V VIN = 3.3V VIN = 2.7V LM27313 SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 www.ti.com MAXIMUM SWITCH CURRENT The maximum FET switch current available before the current limiter cuts in is dependent on duty cycle of the application. This is illustrated in Figure 15 below which shows typical values of switch current as a function of effective (actual) duty cycle: Figure 15. Switch Current Limit vs Duty Cycle 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) where • "DC" is the duty cycle of the application. (9) The switch current can be found by: ISW = IIND(AVG) + ½ (IRIPPLE) (10) Inductor ripple current is dependent on inductance, duty cycle, input voltage and frequency: IRIPPLE = DC x (VIN - VSW) / (fSW x L) (11) Combining all terms, we can develop an expression which allows the maximum available load current to be calculated: (12) 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 and displayed the maximum load current available for a typical device in graph form: 10 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LM27313 |
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