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LT1110-12 Datasheet(PDF) 13 Page - Linear Technology |
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LT1110-12 Datasheet(HTML) 13 Page - Linear Technology |
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13 / 16 page  LT1110 13 Arrangement of the gain block as a low battery detector is straightforward. Figure 12 shows hookup. R1 and R2 need only be low enough in value so that the bias current of the SET input does not cause large errors. 33k Ω for R2 is adequate. R3 can be added to introduce a small amount of hysteresis. This will cause the gain block to “snap” when the trip point is reached. Values in the 1M-10M range are optimal. The addition of R3 will change the trip point, however. S APPLICATI I FOR ATIO Output ripple of the LT1110, normally 90mV at 5VOUT can be reduced significantly by placing the gain block in front of the FB input as shown in Figure 13. This effectively reduces the comparator hysteresis by the gain of the gain block. Output ripple can be reduced to just a few millivolts using this technique. Ripple reduction works with step- down or inverting modes as well. For this technique to be effective, output capacitor C1 must be large, so that each switching cycle increases VOUT by only a few millivolts. 1000 µF is a good starting value. Figure 13. Output Ripple Reduction Using Gain Block Figure 12. Setting Low Battery Detector Trip Point LT1110 • TA07 VBAT R1 R2 220mV REF SET GND VIN LT1110 47k +5V TO PROCESSOR R1 = VLB – 220mV ( ) 4.33 µA VLB = BATTERY TRIP POINT + – AO R3 R2 = 33k Ω R3 = 2M Ω L1 LT1110 • TA08 GND SW2 SET SW1 LIM I IN V D1 R3 270k FB + VOUT R2 R1 C1 V = + 1 220mV OUT R2 R1 ( )( ) LT1110 AO VBAT Table 2. Capacitor Manufacturers MANUFACTURER PART NUMBERS Sanyo Video Components OS-CON Series 2001 Sanyo Avenue San Diego, CA 92173 619-661-6835 Nichicon America Corporation PL Series 927 East State Parkway Schaumberg, IL 60173 708-843-7500 Sprague Electric Company 150D Solid Tantalums Lower Main Street 550D Tantalex Sanford, ME 04073 207-324-4140 Matsuo 267 Series 714-969-2491 Surface Mount Table 3. Transistor Manufacturers MANUFACTURER PART NUMBERS Zetex ZTX Series Commack, NY FZT Series 516-543-7100 Surface Mount Table 1. Inductor Manufacturers MANUFACTURER PART NUMBERS Coiltronics International CTX100-4 Series 984 S.W. 13th Court Surface Mount Pompano Beach, FL 33069 305-781-8900 Sumida Electric Co. USA CD54 708-956-0666 CDR74 CDR105 Surface Mount |
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