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LM317LCLP 데이터시트(PDF) 11 Page - Texas Instruments |
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LM317LCLP 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 29 page R1 = 470 Ω R2 = 5.1 kΩ C1 = 25 µF 2N2905 R3 = 50 kΩ 1N4002 VO = 15 V VI LM317L Adjustment Output Input R3 = 240 Ω VI C1 = 0.1 µF C2 = 1 µF Output Adjust VO R2 = 1.5 kΩ R1 = 470 Ω LM317L R4 = 2 kΩ Adjustment Output Input LM317L Adjustment Output Input LM317L www.ti.com SLCS144E – JULY 2004 – REVISED OCTOBER 2014 General Configurations (continued) 9.3.4 Tracking Preregulator Circuit The tracking preregulator circuit application keeps a constant voltage across the second LM317L in the circuit. Figure 6. Tracking Preregulator Circuit 9.3.5 Slow-Turn On 15-V Regulator Circuit The capacitor C1, in combination with the PNP transistor, helps the circuit to slowly start supplying voltage. In the beginning, the capacitor is not charged. Therefore, output voltage will start at 1.9 V, as determined by Equation 5. As the capacitor voltage rises, VOUT will rise at the same rate. When the output voltage reaches the value determined by R1 and R2, the PNP will be turned off. VC1 + VBE + 1.25 V = 0 V + 0.65 V + 1.25 V = 1.9 V (5) Figure 7. Slow-Turn On 15-V Regulator Circuit Copyright © 2004–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM317L |
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