поискавой системы для электроныых деталей |
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UC3380 датащи(PDF) 7 Page - Unisonic Technologies |
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UC3380 датащи(HTML) 7 Page - Unisonic Technologies |
7 / 9 page UC3380 CMOS IC UNISONICTECHNOLOGIESCO.,LTD 7 of 9 www.unisonic.com.tw QW-R502-099.D APPLICATION CIRCUIT INFORMATION (Cont.) 6. Output ripple voltage is given by () PP C L O VU ESR I I =Δ + • − (ESR: equivalent series resistance of the output capacitor) () PP L O Q VESR I I C Δ =+ • − Then we give the following example about choosing external components by considering the design parameters. Design parameters: UIN=1.5V UO=2.1V IO=200mA VPP=100mV f=300KHz ICR=0.2 Assume UD and US are both 0.3V, the duty ratio is 2.1 0.3 1.5 0.429 2.1 0.3 0.3 OD IN OD S UU U d UU U +− +− == = +− + − In order to generate the desired output current and ICR, the value of inductor should meets the following formula L ≤ (1– d)2(UO+UD-UIN) ICR • IO • f = (1– 0.429)2(2.1V+0.3V-1.5V) 0.2×0.2A×300000HZ = 24.5uH Calculate the average current and the peak current of inductor 0.2 0.35 1 1 0.429 O L I A IA d == = −− 11 (1 ) 0.35 (1 0.2) 0.385 22 PK L II ICR A A =+ = × + × = So, we make a trial of choosing a 22uH inductor that allowable maximum current is lager than 0.385A. Determine the delta charge stores in C3 during charging up 11 0.429 ( ) (0.35 0.2 ) 0.286 300000 LO d QI I A A uC fHZ −− Δ= − • = − × = Assume the ESR of C3 is 0.15Ω, determine the value of C3 6 0.286 10 3.69 ( ) 0.1 0.15 (0.35 0.2 ) PP L O QC CuF VESR I I A A − Δ× ≥= = −• − − Ω × − Therefore, a Tantalum capacitor with value of 10uF and ESR of 0.15Ω can be used as output capacitor. However, the optimized value should be obtained by experiment. |
Аналогичный номер детали - UC3380_15 |
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Аналогичное описание - UC3380_15 |
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