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TC2574 数据表(PDF) 10 Page - TelCom Semiconductor, Inc |
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TC2574 数据表(HTML) 10 Page - TelCom Semiconductor, Inc |
10 / 25 page TC2574 10 TC2574-1 1/6/00 0.5A Step-Down Switching Regulator Procedure (Adjustable Output Version: TC2574-ADJ) (Continued) Procedure Example 5. Output Capacitor Selection (COUT ) A. Since the TC2574 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 ≥ 13,000 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 ≥ 13,300 x 40 22.2 µF 24 x 1000 To achieve an acceptable ripple voltage, select COUT 100 µF electrolytic capacitor. Table 1. Diode Selection Guide gives an overview about through-hole diodes for an effective design. 1.0 Amp Diodes VR Schottky Fast Recovery 20V 1N5817 MBR120P 30V 1N5818 MUR110 MBR130P (rated to 100V) 40V 1N5819 MBR140P 50V MBR150 60V MBR160 |
类似零件编号 - TC2574 |
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类似说明 - TC2574 |
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