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LM1084 データシート(PDF) 10 Page - Texas Instruments |
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LM1084 データシート(HTML) 10 Page - Texas Instruments |
10 / 29 page LM1084 SNVS037G – SEPTEMBER 1999 – REVISED JANUARY 2015 www.ti.com Feature Description (continued) However, the adjustable version allows this degradation of ripple rejection to be compensated. The adjust terminal can be bypassed to ground with a capacitor (CADJ). The impedance of the CADJ should be equal to or less than R1 at the desired ripple frequency. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. 1/(2 π × fRIPPLE*CADJ) ≤ R1 (1) 7.3.2 Load Regulation The LM1084 regulates the voltage that appears between its output and ground pins, or between its output and adjust pins. In some cases, line resistances can introduce errors to the voltage across the load. To obtain the best load regulation, a few precautions are needed. Figure 12 shows a typical application using a fixed output regulator. Rt1 and Rt2 are the line resistances. VLOAD is less than the VOUT by the sum of the voltage drops along the line resistances. In this case, the load regulation seen at the RLOAD would be degraded from the data sheet specification. To improve this, the load should be tied directly to the output pin on the positive side and directly tied to the ground pin on the negative side. Figure 12. Typical Application Using Fixed Output Regulator When the adjustable regulator is used (Figure 13), the best performance is obtained with the positive side of the resistor R1 tied directly to the output pin of the regulator rather than near the load. This eliminates line drops from appearing effectively in series with the reference and degrading regulation. For example, a 5-V regulator with 0.05 Ω resistance between the regulator and load will have a load regulation due to line resistance of 0.05Ω × IL. If R1 (= 125Ω) is connected near the load the effective line resistance will be 0.05Ω (1 + R2/R1) or in this case, it is 4 times worse. In addition, the ground side of the resistor R2 can be returned near the ground of the load to provide remote ground sensing and improve load regulation. Figure 13. Best Load Regulation Using Adjustable Output Regulator 10 Submit Documentation Feedback Copyright © 1999–2015, Texas Instruments Incorporated Product Folder Links: LM1084 |
同様の部品番号 - LM1084_15 |
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同様の説明 - LM1084_15 |
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