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TS34063CS Datasheet(PDF) 7 Page - Taiwan Semiconductor Company, Ltd |
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TS34063CS Datasheet(HTML) 7 Page - Taiwan Semiconductor Company, Ltd |
7 / 10 page TS34063 Dc to Dc Converter Controller 7/10 Version: A07 Design Formula Table Test Step Up Step Down Voltage Inverting ton toff Vsat Vcc Vin Vf Vout ! ! + (min) (min) Vout Vsat Vcc Vf Vout ! ! + Vsat Vcc Vf Vout ! + | | ( ton+ toff ) min 1 f min 1 f min 1 f CT 4.0 x 10 –5 ton 4.0 x 10 –5 ton 4.0 x 10 –5 ton Ipk(switch) 2Iout(max) !! " # $$ % & + 1 toff ton 2Iout(max) 2Iout(max) !! " # $$ % & + 1 toff ton Rsc !! " # $$ % & ) ( 3 . 0 switch Ipk !! " # $$ % & ) ( 3 . 0 switch Ipk !! " # $$ % & ) ( 3 . 0 switch Ipk L(min) ) ton( ) Ipk(switch Vsat ) Vin( max * min !! " # $$ % & ' (max) * ) ( (min) ton switch Ipk Vout Vsat Vin !! " # $$ % & ' ' (max) * ) ( (min) ton switch Ipk Vsat Vin !! " # $$ % & ' Co !! " # $$ % & ) ( * 9 pp Vripple ton Iout !! " # $$ % & + ) ( 8 ) )( ( pp Vripple toff ton switch Ipk !! " # $$ % & ) ( * 9 pp Vripple ton Iout Terms and Definitions Vsat = Saturation Voltage of the output switch. Vf = Forward Voltage drop of the rectifier. The following power supply characteristics must be chosen: Vin= Normal input voltage Vout: Desied Output voltage, |Vout| =1.25 (1+R2 / R1) Iout : Desired output current. fmin : Minimum desired output switching frequency at the selected values for Vin and Io. Vripple(p-p): Desired peak-to-peak output ripple voltage. in practice, the calculated capacitor value will need to be increased due to its equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation. |
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