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LM317E3 データシート(PDF) 6 Page - Cystech Electonics Corp. |
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LM317E3 データシート(HTML) 6 Page - Cystech Electonics Corp. |
6 / 10 page CYStech Electronics Corp. Spec. No. : C513E3 Issued Date : 2003.04.09 Revised Date :2005.05.17 Page No. : 6/10 LM317E3 CYStek Product Specification + Cin 0.1µF Adjust Vin Vout PL317 R2 1% R1 1% Co 1µF RL Vo + D1 * CAdj 10µF 1N4002 Vout=10V * D1 Discharges CAdj if output is shorted to ground 24V 14V f=120Hz Application Information Basic Circuit Operation The LM317 is a 3-terminal floating regulator. In operation, the LM317 develops and maintains a nominal 1.25V reference (Vref) between its output and adjustment terminals. This reference voltage is converted to a programming current (Iprog) by R1(see Fig 5), and this constant current flows through R2 to ground. The regulated output voltage is given by: Vout=Vref (1+R2/R1)+IAdjR2 Since the current from the adjustment terminal (IAdj) represents an error term in the equation, the LM317 was designed to control IAdj to less than 100 µA and keep it constant. To do this, all quiescent operating current is returned to the output terminal. This imposes the requirement for a minimum load current. If the load current is less than this minimum, the output voltage will rise. Since the LM317 is a floating regulator, it is only the voltage differential across the circuit which is important to performance, and operation at high voltages with respect to ground is possible. R1 R2 Vout Adjust Vin Vout IAdj PL317 Iprog Vref Vref=1.25V typical Fig 4. Ripple Rejection Test Circuit Fig 5. Basic Circuit Configuration LM317 LM317 |
同様の部品番号 - LM317E3 |
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同様の説明 - LM317E3 |
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