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CAT32TDI-T3 Datasheet(PDF) 7 Page - Catalyst Semiconductor |
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CAT32TDI-T3 Datasheet(HTML) 7 Page - Catalyst Semiconductor |
7 / 14 page CAT32 © Catalyst Semiconductor, Inc. 7 Doc. No. MD-5001 Rev. AD Characteristics subject to change without notice APPLICATION INFORMATION INDUCTOR SELECTION AND EFFICIENCY Inductor vendors are shown below. Contact the manufacturer for detailed technical data and new product information. Table 1: Inductor Manufacturers Inductor L (μH) Maximum DCR (mΩ) Maximum Height (mm) Vendor Web ELJEA4R7 4.7 180 2.2 ELJEA6R8 6.8 250 2.2 Panasonic 714.373.7334 www.panasonic.com LQH3C4R7M24, LQH32CN4R7M11 4.7 260 2.2 LQH3C100K24, LQH32CN100K11 10 300 2.2 Murata 770.436.1300 www.murata.com LB2016B4R7 4.7 250 2.0 LB2016B100 3.8 350 2.0 Taiyo Yuden 408.573.4150 www.t-yuden.com CMD4D06-4R7 4.7 216 0.8 CMD4D06-6R8 6.8 296 0.8 CLQ4D10-4R7 4.7 162 1.2 CLQ4D10-6R8 6.8 195 1.2 Sumida 847.956.0666 www.sumida.com CAPACITOR SELECTION Low ESR (equivalent series resistance) capacitors should be used at the output to minimize the output ripple voltage. The low ESR and small package options available with multilayer ceramic capacitors make them excellent choices. The X5R and X7R capacitor types are preferred because they retain their capacitance over wider voltage and temperature ranges than the Y5V or Z5U types. A 1.0µF or 2.2µF output capacitor is recommended for most applications. The voltage rating of the output capacitor C2 depends on the number of LEDs driven in series. A 10V ceramic capacitor is recommended when driving two LEDs. A 16V ceramic capacitor is recommended when driving 3 or 4 LEDs. Table 2: Ceramic Capacitor Manufacturers Supplier Phone Web Taiyo Yuden 408.573.4150 www.t-yuden.com Murata 814.237.1431 www.murata.com Kemet 408.986.0424 www.kemet.com Low profile ceramic capacitors with a 1mm maximum height/thickness are available for designs height requirements. Ceramic capacitors also make a good choice for the input capacitor, which should be mounted as close as possible to the CAT32. A 2.2µF or 4.7µF input capacitor is recommended. Table 2 shows a list of several ceramic capacitor manufacturers. Consult the manufacturers for detailed information as new products and package options are introduced regularly. |
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