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L3380 Datasheet(PDF) 6 Page - Unisonic Technologies |
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L3380 Datasheet(HTML) 6 Page - Unisonic Technologies |
6 / 9 page L3380 CMOS IC UNISONICTECHNOLOGIESCO.,LTD 6 of 9 www.unisonic.com.tw QW-R502-099,A APPLICATION CIRCUIT INFORMATION The following equations show the relation of the basic design parameters. 1. Refer to the application circuit, the increasing inductor current when the switch is turn on is given by the following equation 11 () LL ON IN S d iU T U U LL f + ∆= = − ( IN U :input voltage ; S U :transistor saturation voltage) The decreasing inductor current when the switch is turn off can derive by the equation below 11 1 () LL OFF O D IN d iU T U U U LL f − − ∆= = − + − ( D U :diode forward voltage) according to 0 LL ii +− ∆+ ∆ = ,the duty ratio is given by OD IN OD S UU U d UU U +− = +− 2. The average current flowing through the inductor is 1 O L I I d = − 3. We note that (1 ) OL I dI =− then we can write: (1 ) L OL L I I di i =− • ∆ ∆ substituting 1 LL OFF iU T L ∆= L i ∆ for equation above, output current is given by 11 (1 ) OL OFF I dU T ICR L =− • • ( ICR = L L i I ∆ ) 11 1 (1 ) ( ) OD IN d Id Uo U U ICR L f − =− • • + − IO=(1-d )2• ICR • L• f UO+UD –UIN derive that L = (1– d) 2(U O+UD-UIN) ICR • IO • f 4. The peak current of the inductor is given by 1 2 PKL L I Ii =+ ∆ 1 2 L PKL L L i I II I ∆ =+ • according to ICR = L L i I ∆ derive that 1 2 PKL L I IICR I =+ • Then derive the following equation for peak current of inductor 1 (1 ) 2 PK L I IICR =+ |
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