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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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LM3352MTCX-2.5 Arkusz danych(PDF) 9 Page - National Semiconductor (TI) |
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LM3352MTCX-2.5 Arkusz danych(HTML) 9 Page - National Semiconductor (TI) |
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9 / 11 page  Filter Capacitor Selection (Continued) iii) C FIL A 1 µF, XR7 ceramic capacitor should be connected to pin C FIL. This capacitor provides the filtering needed for the in- ternal supply rail of the LM3352. Of the different capacitor technologies, a sample of vendors that have been verified as suitable for use with the LM3352 are shown in Table 2. TABLE 2. Capacitor Vendor Information Manufacturer Tel Fax Website Ceramic Taiyo-yuden (408) 573-4150 (408) 573-4159 www.t-yuden.com AVX (803) 448-9411 (803) 448-1943 www.avxcorp.com Tantalum Sprague/Vishay (207) 324-4140 (207) 324-7223 www.vishay.com Nichicon (847) 843-7500 (847) 843-2798 www.nichicon.com Polymer Electrolytic Cornell-Dubilier (ESRD) (508) 996-8561 (508) 996-3830 www.cornell-dubilier.com Sanyo (POSCAP) (619) 661-6322 (619) 661-1055 www.sanyovideo.com Maximum Available Output Current The LM3352 cannot provide 200 mA under all V IN and VOUT conditions. The V OUT vs VIN graphs in the Typical Perfor- mance Characteristics section show the minimum V IN at which the LM3352 is capable of providing different load cur- rents while maintaining V OUT regulation. Refer to the Electri- cal Characteristics for guaranteed conditions. Maximum Load Under Start-Up Due to the LM3352’s unique start-up sequence, it is not able to start up under all load conditions. Starting with 45 mA or less will allow the part to start correctly under any tempera- ture or input voltage conditions. After the output is in regula- tion, any load up to the maximum as specified in the Electri- cal Characteristics may be applied. Using a Power On Reset circuit, such as the LP3470, is recommended if greater start up loads are expected. Under certain conditions the LM3352 can start up with greater load currents without the use of a Power On Reset Circuit ( See application note AN-1144: Maximizing Startup Loads with the LM3352 Regulated Buck/Boost Switched Capacitor Converter). Thermal Protection During output short circuit conditions, the LM3352 will draw high currents causing a rise in the junction temperature. On-chip thermal protection circuitry disables the charge pump action once the junction temperature exceeds the thermal trip point, and re-enables the charge pump when the junction temperature falls back to a safe operating point. Typical Application Circuits DS101037-33 FIGURE 2. Basic Buck/Boost Regulator www.national.com 9 |
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Podobny opis - LM3352MTCX-2.5 |
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