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## LM2595 Datasheet(PDF) 11 Page - National Semiconductor (TI)

 Part # LM2595 Description SIMPLE SWITCHER Power Converter 150 kHz 1A Step-Down Voltage Regulator Download 29 Pages Scroll/Zoom 100% Manufacturer NSC [National Semiconductor (TI)] Direct Link http://www.national.com Logo

## LM2595 Datasheet(HTML) 11 Page - National Semiconductor (TI)

 11 / 29 pageLM2595 Series Buck Regulator Design Procedure (Fixed Output) (Continued)LM2595 Series Buck Regulator Design Procedure (Adjustable Output)PROCEDURE (Adjustable Output Voltage Version)EXAMPLE (Adjustable Output Voltage Version)Given:VOUT = Regulated Output VoltageVIN(max) = Maximum Input VoltageILOAD(max) = Maximum Load CurrentF = Switching Frequency(Fixed at a nominal 150 kHz).Given:VOUT = 20VVIN(max) = 28VILOAD(max) = 1AF = Switching Frequency(Fixed at a nominal 150 kHz).1. Programming Output Voltage (Selecting R1 and R2,asshown inFigure 1)Use the following formula to select the appropriate resistorvalues.Select a value for R1 between 240Ω and 1.5 kΩ. The lowerresistor values minimize noise pickup in the sensitive feed-back pin. (For the lowest temperature coefficient and the beststability with time, use 1% metal film resistors.)1. Programming Output Voltage (Selecting R1 and R2,asshown inFigure 1)Select R1 to be 1 kΩ,1%. Solve for R2.R2 = 1k (16.26 − 1) = 15.26k, closest 1% value is 15.4 kΩ.R2 = 15.4 kΩ.Procedure continued on next page.Example continued on next page.ConditionsInductorOutput CapacitorThrough Hole ElectrolyticSurface Mount TantalumOutputLoadMax InputInductanceInductorPanasonicNichiconAVX TPSSpragueVoltageCurrentVoltage(µH)(#)HFQ SeriesPL SeriesSeries595D Series(V)(A)(V)(µF/V)(µF/V)(µF/V)(µF/V)3.31522L24330/16330/16220/10330/10733L23270/25270/25220/10270/101047L31220/25220/35220/10220/104068L30180/35220/35220/10180/10647L13220/25220/16220/10220/100.51068L21150/35150/25100/16150/1640100L20150/3582/35100/16100/2051833L28330/16330/16220/10270/101047L31220/25220/25220/10220/101568L30180/35180/35220/10150/1640100L29180/35120/35100/16120/16968L21180/16180/16220/10150/160.520150L19120/251200/25100/16100/2040150L19100/25100/2568/2068/251211547L31220/25220/2568/20120/201868L30180/35120/2568/20120/2030150L3682/2582/2568/20100/2040220L3582/2582/2568/2068/251568L21180/25180/2568/20120/200.520150L1982/2582/2568/20100/2040330L2656/2556/2568/2068/25FIGURE 2. LM2595 Fixed Voltage Quick Design Component Selection Tablewww.national.com11

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