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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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LT1111CS8 Arkusz danych(PDF) 13 Page - Linear Technology |
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LT1111CS8 Arkusz danych(HTML) 13 Page - Linear Technology |
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13 / 16 page  13 LT1111 1111fd S APPLICATI I FOR ATIO Table 2. Inductor Manufacturers MANUFACTURER PART NUMBERS Coiltronics Incorporated CTX100-4 Series 6000 Park of Commerce Blvd. Surface Mount Boca Raton, FL 33487 407-241-7876 Toko America Incorporated Type 8RBS 1250 Feehanville Drive Mount Prospect, IL 60056 312-297-0070 Sumida Electric Co. USA CD54 708-956-0666 CDR74 CDR105 Surface Mount Using the Gain Block The gain block (GB) on the LT1111 can be used as an error amplifier, low-battery detector or linear post regulator. The gain block itself is a very simple PNP input op amp with an open collector NPN output. The negative input of the gain block is tied internally to the 1.25V reference. The positive input comes out on the SET pin. 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 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 to 10M range are optimal. However, the addition of R3 will change the trip point. Table 3. Capacitor Manufacturers MANUFACTURER PART NUMBERS Sanyo Video Components OS-CON Series 1201 Sanyo Avenue San Diego, CA 92073 619-661-6322 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 LT1111 • F12 VBAT R1 R2 1.25V REF SET GND IN V LT1111 47k 5V TO PROCESSOR + – A0 R3 R1 = VLB – 1.25V 35.1 µA VLB = BATTERY TRIP POINT R2 = 33k R3 = 1.6M Figure 12. Setting Low-Battery Detector Trip Point Table 1. Component Selection for Common Converters INPUT OUTPUT OUTPUT CIRCUIT INDUCTOR INDUCTOR CAPACITOR VOLTAGE VOLTAGE CURRENT (MIN) FIGURE VALUE PART NUMBER VALUE NOTES 2 to 3.1 5 90mA 4 15 µH S CD75-750K 33 µF* 2 to 3.1 5 10mA 4 47 µH S CD54-470K, C CTX50-1 10 µF 2 to 3.1 12 30mA 4 15 µH S CD75-150K 22 µF 2 to 3.1 12 10mA 4 47 µH S CD54-470K, C CTX50-1 10 µF 5 12 90mA 4 33 µH S CD75-330K 22 µF 5 12 30mA 4 47 µH S CD75-470K, C CTX50-1 15 µF 6.5 to 11 5 50mA 5 15 µH S CD54-150K 47 µF** 12 to 20 5 300mA 5 56 µH S CD105-560K, C CTX50-4 47 µF** 20 to 30 5 300mA 5 120 µH S CD105-121K, C CTX100-4 47 µF** 5 –5 75mA 6 56 µH S CD75-560K, C CTX50-4 47 µF 12 –5 250mA 6 120 µH S CD105-121K, C CTX100-4 100 µF** S = Sumida C = Coiltronics * Add 47 Ω from ILIM to VIN ** Add 220 Ω from ILIM to VIN |
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