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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LTM8068 Datenblatt(PDF) 11 Page - Linear Technology |
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LTM8068 Datenblatt(HTML) 11 Page - Linear Technology |
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11 / 20 page  LTM8067 11 8067fc For more information www.linear.com/LTM8067 APPLICATIONS INFORMATION For most applications, the design process is straight forward, summarized as follows: 1. Look at Table 1 and find the row that has the desired input range and output voltage. 2. Apply the recommended CIN, COUT and RFB. Whilethesecomponentcombinationshavebeentestedfor proper operation, it is incumbent upon the user to verify proper operation over the intended system’s line, load and environmental conditions. Bear in mind that the maximum output current may be limited by junction temperature, the relationship between the input and output voltage magnitude and polarity and other factors. Please refer to the graphs in the Typical Performance Characteristics section for guidance. Capacitor Selection Considerations The CIN and COUT capacitor values in Table 1 are the minimum recommended values for the associated oper- ating conditions. Applying capacitor values below those indicated in Table 1 is not recommended, and may result in undesirable operation. Using larger values is generally acceptable, and can yield improved dynamic response, if it is necessary. Again, it is incumbent upon the user to verify proper operation over the intended system’s line, load and environmental conditions. Ceramic capacitors are small, robust and have very low ESR. However, not all ceramic capacitors are suitable. X5R and X7R types are stable over temperature and ap- plied voltage and give dependable service. Other types, including Y5V and Z5U have very large temperature and voltage coefficients of capacitance. In an application cir- cuit they may have only a small fraction of their nominal capacitance resulting in much higher output voltage ripple than expected. A final precaution regarding ceramic capacitors concerns the maximum input voltage rating of the LTM8067. A ceramic input capacitor combined with trace or cable inductance forms a high-Q (underdamped) tank circuit. If the LTM8067 circuit is plugged into a live supply, the input voltage can ring to much higher than its nominal value, possibly exceeding the device’s rating. This situation is easily avoided; see the Hot-Plugging Safely section. Table 1. Recommended Component Values for Specific VOUT Values VIN VOUT CIN COUT RFB 2.8V to 40V 2.5V 2.2µF, 50V, 1206 100µF, 6.3V, 1210 15.4k 2.8V to 40V 3.3V 2.2µF, 50V, 1206 47µF, 6.3V, 1210 11.8k 2.8V to 40V 5V 2.2µF, 50V, 1206 22µF, 16V, 1210 8.25k 2.8V to 37V 8V 2.2µF, 50V, 1206 22µF, 16V, 1210 5.23k 2.8V to 33V 12V 4.7µF, 50V, 1206 10µF, 50V, 1210 3.48k 2.8V to 30V 15V 4.7µF, 50V, 1206 4.7µF, 25V, 1210 2.8k 2.8V to 27V 18V 4.7µF, 50V, 1206 4.7µF, 25V, 1210 2.37k 2.8V to 21V 24V 4.7µF, 50V, 1206 4.7µF, 25V, 1210 1.78k Note: An input bulk capacitor is required. |
Ähnliche Teilenummer - LTM8068 |
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Ähnliche Beschreibung - LTM8068 |
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