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LTM8056 数据表(PDF) 11 Page - Linear Technology |
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LTM8056 数据表(HTML) 11 Page - Linear Technology |
11 / 28 page LTM8056 11 8056fa For more information www.linear.com/LTM8056 APPLICATIONS INFORMATION For most applications, the design process is straight for- ward, 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, RFB1/RFB2 and RT values. 3. Apply the output sense resistor to set the output current limit. The output current is limited to 58mV/RSENSE, where RSENSE is the value of the output current sense resistor in ohms. 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 is limited by junction temperature, the rela- tionship between the input and output voltage magnitude and other factors. Please refer to the graphs in the Typical Performance Characteristics section for guidance. The maximum frequency (and attendant RT value) at which the LTM8056 should be allowed to switch is given in Table 1 in the fMAX column, while the recommended frequency (and RT value) for optimal efficiency over the given input condition is given in the fOPTIMAL column. There are additional conditions that must be satisfied if the synchronization function is used. Please refer to the Synchronization section for details. Note that Table 1 calls out both ceramic and electrolytic output capacitors. Both of the capacitors called out in the table must be applied to the output. The electrolytic capacitors in Table 1 are described by voltage rating, value and ESR. The voltage rating of the capacitor may be increased if the application requires a higher voltage stress derating. The LTM8056 can tolerate variation in the ESR; other capacitors with different ESR may be used, but the user must verify proper operation over line, load and environmental conditions. Table 2 gives the description and part numbers of electrolytic capacitors used in the LTM8056 development testing and design validation. Table 1. Recommended Component Values and Configuration (TA = 25°C) VIN RANGE VOUT CIN COUT RFB1/RFB2 fOPTIMAL (kHz) RT(OPTIMAL) fMAX (kHz) RT(MAX) 5V to 24V 3.3V 2 × 4.7µF, 50V, 0805 22µF, 6.3V, X5R, 0805 100µF, 6V, 75mΩ, Electrolytic 100k/56.2k 650 31.6k 800 24.9k 5V to 22V 5V 2 × 4.7µF, 50V, 0805 22µF, 6.3V, X5R, 0805 100µF, 6V, 75mΩ, Electrolytic 100k/31.6k 450 53.6k 800 24.9k 5V to 28V 8V 2 × 4.7µF, 50V, 0805 22µF, 10V, X7R, 1206 100µF, 16V, 100mΩ, Electrolytic 100k/17.4k 500 45.3k 800 24.9k 5V to 41V 12V 2 × 4.7µF, 50V, 0805 22µF, 25V, X5R, 0805 68µF, 16V, 200mΩ, Electrolytic 100k/11k 650 31.6k 800 24.9k 5.8V to 58V 18V 3 × 2.2µF, 100V, 1206 22µF, 25V, X5R, 0805 47µF, 25V, 900mΩ, Electrolytic 100k/6.98k 650 31.6k 800 24.9k 7V to 58V 24V 3 × 2.2µF, 100V, 1206 22µF, 25V, X5R, 0805 33µF, 35V 300mΩ, Electrolytic 100k/5.23k 525 43.2k 800 24.9k 8.5V to 58V 36V 3 × 2.2µF, 100V, 1206 10µF, 50V, X5R, 1206 10µF, 50V 120mΩ, Electrolytic 100k/3.40k 500 45.3k 800 24.9k 12.5V to 58V 48V 3 × 2.2µF, 100V, 1206 10µF, 50V, X5R, 1206 10µF, 63V 120mΩ, Electrolytic 100k/2.55k 475 49.9k 800 24.9k Notes: An input bulk capacitor is required. The output capacitance uses a combination of a ceramic and electrolytic in parallel. Other combinations of resistor values for the RFB network are acceptable. |
类似零件编号 - LTM8056 |
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类似说明 - LTM8056 |
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