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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TC2575-3.3VAT Fiches technique(PDF) 10 Page - TelCom Semiconductor, Inc |
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TC2575-3.3VAT Fiches technique(HTML) 10 Page - TelCom Semiconductor, Inc |
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10 / 25 page  TC2575 1.0A Step-Down Switching Regulator 10 TC2575-1 3/13/00 Procedure (Adjustable Output Version: TC2575-ADJ) (Continued) Procedure Example 5. Output Capacitor Selection (COUT ) A. Since the TC2575 is a forward–mode switching regulator with voltage mode control, its open loop 2–pole–1–zero frequency characteristic has the dominant pole–pair determined by the output capacitor and inductor values. For stable operation, the capacitor must satisfy the following requirement: COUT ≥ 7.785 VIN(max) [ µF] VOUT x L [µF] B. Capacitor values between 10 µF and 2000µF will satisfy the loop requirements for stable operation. To achieve an acceptable output ripple voltage and transient response, the output capacitor may need to be several times larger than the above formula yields. C. Due to the fact that the higher voltage electrolytic capaci- tors generally have lower ESR (Equivalent Series Resistance) numbers, the output capacitor’s voltage rating should be at least 1.5 times greater than the output voltage. For a 5.0V regulator, a rating of at least 8.0V is appropriate, and a 10V or 16V rating is recommended. 5. Output Capacitor Selection (COUT ) A. COUT ≥ 7.785 12 = 53 µF 8 x 220 To achieve an acceptable ripple voltage, select COUT 100µF electrolytic capacitor. Table 1. Inductor Selection Guide Inductor Code Inductor Value Pulse Eng Renco AIE Tech 39 L100 100 µHPE–92108 RL2444 415–0930 77 308 BV L150 150 µHPE–53113 RL1954 415–0953 77 358 BV L220 220 µHPE–52626 RL1953 415–0922 77 408 BV L330 330 µHPE–52627 RL1952 415–0926 77 458 BV L470 470 µHPE–53114 RL1951 415–0927 – L680 680 µHPE–52629 RL1950 415–0928 77 508 BV H150 150 µH PE–53115 RL2445 415–0936 77 368 BV H220 220 µHPE–53116 RL2446 430–0636 77 410 BV H330 330 µHPE–53117 RL2447 430–0635 77 460 BV H470 470 µHPE–53118 RL1961 430–0634 – H680 680 µHPE–53119 RL1960 415–0935 77 510 BV H1000 1000 µHPE–53120 RL1959 415–0934 77 558 BV H1500 1500 µHPE–53121 RL1958 415–0933 – H2200 2200 µHPE–53122 RL2448 415–0945 77 610 BV Note: *Contact Manufacturer |
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