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SC4541SKTRT Datasheet(PDF) 11 Page - Semtech Corporation |
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SC4541SKTRT Datasheet(HTML) 11 Page - Semtech Corporation |
11 / 19 page SC4541 11 Applications Information ( continued) A 1µF ceramic input and output capacitor should be ade- quate for most applications. Larger capacitance reduces voltage ripple, overshoot and undershoot during load transient as well as improving loop stability margin. Recommended ceramic capacitor manufacturers are listed in Table 1. Table 2 — Recommended Ceramic Capacitor Manufacturers Vendor Phone Website Kemet 408-986-0424 www.kemet.com Murata 814-237-1431 www.murata.com Taiyo Yuden 408-573-4150 www.t-yuden.com The converter has higher efficiency under CCM and the inductor peak current is calculated by the following equation. L F 2 D V I I S IN IN PEAK _ L Assuming CCM, the duty ratio is calculated using the fol- lowing equation. D OUT D IN OUT V V V V V D V D is the forward voltage drop of the internal Schottky rectifier. The inductor ripple current is further shown by the follow- ing equation. L F D V I S IN RIPPLE _ L The recommended inductance shown in Table 1 is based on operation with regulated 5V input, dual Li-ion or three Li-ion battery packs. Increased inductance is required for higher input and output voltage configurations. Table 1 — Inductance Requirements, Driving 6 bWLED Input Type Input Voltage Range L1 Induc- tance Regulated 5V 4.5 to 5.5V 10µH Dual Lithium Ion Battery Pack 5.4 to 8.4V 22µH Three Lithium Ion Battery Pack 8.1 to 12.6V 33µH Output Capacitor Selection Ceramic capacitors are placed near IN and OUT pins to ground in order to minimize ripple voltage. The minimum capacitance needed for a given ripple can be estimated using the following equation. RIPPLE S OUT OUT IN OUT OUT V F V I V V C V RIPPLE = Peak to peak output voltage ripple I OUT = Output current V OUT = Boost output voltage V IN = Input voltage F S = Switching frequency |
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