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LM2595 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
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LM2595 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
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11 / 29 page  LM2595 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: V OUT = Regulated Output Voltage V IN(max) = Maximum Input Voltage I LOAD(max) = Maximum Load Current F = Switching Frequency (Fixed at a nominal 150 kHz). Given: V OUT = 20V V IN(max) = 28V I LOAD(max) = 1A F = Switching Frequency (Fixed at a nominal 150 kHz). 1. Programming Output Voltage (Selecting R 1 and R2,as shown in Figure 1) Use the following formula to select the appropriate resistor values. Select a value for R 1 between 240Ω and 1.5 kΩ. The lower resistor values minimize noise pickup in the sensitive feed- back pin. (For the lowest temperature coefficient and the best stability with time, use 1% metal film resistors.) 1. Programming Output Voltage (Selecting R 1 and R2,as shown in Figure 1) Select R 1 to be 1 kΩ,1%. Solve for R2. R 2 = 1k (16.26 − 1) = 15.26k, closest 1% value is 15.4 kΩ. R 2 = 15.4 kΩ. Procedure continued on next page. Example continued on next page. Conditions Inductor Output Capacitor Through Hole Electrolytic Surface Mount Tantalum Output Load Max Input Inductance Inductor Panasonic Nichicon AVX TPS Sprague Voltage Current Voltage (µH) (#) HFQ Series PL Series Series 595D Series (V) (A) (V) (µF/V) (µF/V) (µF/V) (µF/V) 3.3 1 5 22 L24 330/16 330/16 220/10 330/10 7 33 L23 270/25 270/25 220/10 270/10 10 47 L31 220/25 220/35 220/10 220/10 40 68 L30 180/35 220/35 220/10 180/10 6 47 L13 220/25 220/16 220/10 220/10 0.5 10 68 L21 150/35 150/25 100/16 150/16 40 100 L20 150/35 82/35 100/16 100/20 5 1 8 33 L28 330/16 330/16 220/10 270/10 10 47 L31 220/25 220/25 220/10 220/10 15 68 L30 180/35 180/35 220/10 150/16 40 100 L29 180/35 120/35 100/16 120/16 9 68 L21 180/16 180/16 220/10 150/16 0.5 20 150 L19 120/25 1200/25 100/16 100/20 40 150 L19 100/25 100/25 68/20 68/25 12 1 15 47 L31 220/25 220/25 68/20 120/20 18 68 L30 180/35 120/25 68/20 120/20 30 150 L36 82/25 82/25 68/20 100/20 40 220 L35 82/25 82/25 68/20 68/25 15 68 L21 180/25 180/25 68/20 120/20 0.5 20 150 L19 82/25 82/25 68/20 100/20 40 330 L26 56/25 56/25 68/20 68/25 FIGURE 2. LM2595 Fixed Voltage Quick Design Component Selection Table www.national.com 11 |
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