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ADP1611ARMZ-R7 データシート(PDF) 11 Page - Analog Devices |
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ADP1611ARMZ-R7 データシート(HTML) 11 Page - Analog Devices |
11 / 20 page ADP1611 Rev. 0 | Page 11 of 20 Table 4. Inductor Manufacturers Vendor Part L (µH) Max DC Current Max DCR (mΩ) Height (mm) CMD4D11-2R2MC 2.2 0.95 116 1.2 CMD4D11-4R7MC 4.7 0.75 216 1.2 CDRH4D28-100 10 1.00 128 3.0 CDRH5D18-220 22 0.80 290 2.0 CR43-4R7 4.7 1.15 109 3.5 Sumida 847-956-0666 www.sumida.com CR43-100 10 1.04 182 3.5 DS1608-472 4.7 1.40 60 2.9 Coilcraft 847-639-6400 www.coilcraft.com DS1608-103 10 1.00 75 2.9 D52LC-4R7M 4.7 1.14 87 2.0 Toko 847-297-0070 www.tokoam.com D52LC-100M 10 0.76 150 2.0 Using the duty cycle and switching frequency, fSW, determine the on time by the following equation: tON = SW f D (4) The inductor ripple current (∆IL) in steady state is ∆ IL = L t V ON IN × (5) Solving for the inductance value, L, L = L ON IN I t V ∆ × (6) Make sure that the peak inductor current (the maximum input current plus half the inductor ripple current) is below the rated saturation current of the inductor. Likewise, make sure that the maximum rated rms current of the inductor is greater than the maximum dc input current to the regulator. For duty cycles greater than 50%, which occur with input voltages greater than one-half the output voltage, slope compensation is required to maintain stability of the current- mode regulator. For stable current-mode operation, ensure that the selected inductance is equal to or greater than LMIN SW IN OUT MIN f V V L L × − = > A 8 . 1 (7) CHOOSING THE INPUT AND OUTPUT CAPACITORS The ADP1611 requires input and output bypass capacitors to supply transient currents while maintaining constant input and output voltage. Use a low equivalent series resistance (ESR) input capacitor, 10 µF or greater, to prevent noise at the ADP1611 input. Place the capacitor between IN and GND as close to the ADP1611 as possible. Ceramic capacitors are preferred because of their low ESR characteristics. Alternatively, use a high value, medium ESR capacitor in parallel with a 0.1 µF low ESR capacitor as close to the ADP1611 as possible. The output capacitor maintains the output voltage and supplies current to the load while the ADP1611 switch is on. The value and characteristics of the output capacitor greatly affect the output voltage ripple and stability of the regulator. Use a low ESR output capacitor; ceramic dielectric capacitors are preferred. For very low ESR capacitors, such as ceramic capacitors, the ripple current due to the capacitance is calculated as follows. Because the capacitor discharges during the on time, tON, the charge removed from the capacitor, QC, is the load current multiplied by the on time. Therefore, the output voltage ripple (∆VOUT) is OUT ON L OUT C OUT C t I C Q V × = = ∆ (8) where: COUT is the output capacitance. IL is the average inductor current. SW ON f D t = and OUT IN OUT V V V D − = Choose the output capacitor based on the following equation: OUT OUT SW IN OUT L OUT V V f V V I C ∆ × × − × ≥ ) ( (9) Table 5. Capacitor Manufacturers Vendor Phone No. Web Address AVX 408-573-4150 www.avxcorp.com Murata 714-852-2001 www.murata.com Sanyo 408-749-9714 www.sanyovideo.com Taiyo–Yuden 408-573-4150 www.t-yuden.com |
同様の部品番号 - ADP1611ARMZ-R7 |
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同様の説明 - ADP1611ARMZ-R7 |
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