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TPS6734ID Datasheet(PDF) 11 Page - Texas Instruments |
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TPS6734ID Datasheet(HTML) 11 Page - Texas Instruments |
11 / 22 page TPS6734I FIXED 12-V 120-mA BOOST-CONVERTER SUPPLY SLVS127A – AUGUST 1995 – REVISED JANUARY 1999 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION efficiency Typical efficiency for the converter circuit shown in Figure 13 is plotted in Figure 10. The efficiency falls off rapidly at very light currents because the supply current is a significant percentage of the load. 82 80 76 74 10 20 30 40 50 60 70 84 86 EFFICIENCY vs OUTPUT CURRENT 88 80 90 100 140 78 110 120 130 IO – Output Current – mA VCC = 5.5 V VCC = 5 V VCC = 4.5 V Figure 10 inductor selection Inductance value is directly proportional to the input voltage and inversely proportional to the output power. The 18 µH shown in the typical circuit is the proper value for operation from 5-V sources up to 2-W loads. A lower inductance value should be used when operating from 3-V sources. Operation from 7 V and higher sources may require inductance values greater than 18 µH. The inductor’s saturation current rating should be greater than three times the dc load current for 5-V inputs and five times the dc load for 3-V inputs. output filter capacitor selection The output filter capacitor should be selected for minimum ESR (equivalent series resistance). Capacitor ESR × ∆IL (change in inductor current) determines the amplitude of the high-frequency ripple on the output voltage. The ESR of the capacitor should be less than 0.25 Ω to keep the output ripple less than 50 mV peak-to-peak over the entire current range (using 18- µH inductor). diode A Schottky diode or a high-speed silicon rectifier should be used. The continuous current rating of the diode should be at least 300 mA for full load (120 mA) operation. |
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