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LTM8055 データシート(PDF) 10 Page - Linear Technology |
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LTM8055 データシート(HTML) 10 Page - Linear Technology |
10 / 26 page LTM8055 10 8055fb For more information www.linear.com/LTM8055 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 LTM8055 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 LTM8055 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 LTM8055 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, X5R, 0805 22µF, 6.3V, X5R, 0805 100µF, 6V, 75mΩ, Electrolytic 100k/56.2k 600 36.5k 800 24.9k 5V to 28V 5V 2 × 4.7µF, 50V, X5R, 0805 22µF, 6.3V, X5R, 0805 100µF, 6V, 75mΩ, Electrolytic 100k/31.6k 550 39.2k 800 24.9k 5V to 31V 8V 2 × 4.7µF, 50V, X5R, 0805 47µF, 10V, X5R, 1206 100µF, 16V, 100mΩ, Electrolytic 100k/17.4k 500 45.3k 800 24.9k 5V to 36V 12V 2 × 4.7µF, 50V, X5R, 1210 22µF, 25V, X5R, 0805 68µF, 16V, 200mΩ, Electrolytic 100k/11k 600 36.5k 800 24.9k 5V to 36V 18V 2 × 4.7µF, 50V, X7R, 1210 2 x 22µF, 25V, X5R, 1210 47µF, 25V, 900mΩ, Electrolytic 100k/6.98k 500 45.3k 800 24.9k 5V to 36V 24V 2 × 4.7µF, 50V, X7R, 1210 22µF, 25V, X5R, 1210 33µF, 35V 300mΩ, Electrolytic 100k/5.23k 650 31.6k 800 24.9k 5.5V to 36V 36V 2 × 4.7µF, 50V, X7R, 1210 10µF, 50V, X5R, 1206 10µF, 50V 120mΩ, Electrolytic 100k/3.40k 650 31.6k 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. Table 2. Electrolytic Caps Used in LTM8055 Testing DESCRIPTION MANUFACTURER PART NUMBER 100µF, 6V, 75mΩ, Tantalum C Case AVX TPSC107M006R0075 100µF, 16V, 100mΩ, Tantalum Y Case AVX TPSY107M016R0100 68µF, 16V, 200mΩ, Tantalum C Case AVX TPSC686M016R0200 47µF, 25V, 900mΩ, Tantalum D Case AVX TAJD476M025R 33µF, 35V, 300mΩ, Tantalum D Case AVX TPSD336M035R0300 10µF, 50V, 120mΩ, Aluminum 6.3 × 6mm case Suncon 50HVP10M |
同様の部品番号 - LTM8055 |
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同様の説明 - LTM8055 |
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