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LM317KC 데이터시트(PDF) 4 Page - Texas Instruments |
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LM317KC 데이터시트(HTML) 4 Page - Texas Instruments |
4 / 10 page LM317 3-TERMINAL ADJUSTABLE REGULATOR SLVS044H – SEPTEMBER 1997 – REVISED DECEMBER 2001 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION R1 240 Ω IAdj R2 Cin (Note A) 0.1 µF CO (Note B) 1.0 µF VI VO NOTES: A. Cin is not required if the regulator is close enough to the power-supply filter. B. CO improves transient response, but is not needed for stability. Since IAdj is typically 50 µA, it is negligible in most applications. Vref = 1.25 V V out + Vref 1 ) R2 R1 ) (I Adj R2) Vout is calculated as: INPUT OUTPUT ADJUST LM317 Figure 1. Adjustable Voltage Regulator C1 0.1 µF R1 120 Ω R2 3 k Ω INPUT OUTPUT ADJUST LM317 VO +35 V R3 680 Ω –10 V Since IAdj is typically 50 µA, it is negligible in most applications. V out + Vref 1 ) R2 ) R3 R1 ) I Adj(R2 ) R3) – 10 V Vout is calculated as: Figure 2. 0-V to 30-V Regulator Circuit |
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