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LM1084 データシート(PDF) 9 Page - Texas Instruments |
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LM1084 データシート(HTML) 9 Page - Texas Instruments |
9 / 29 page LM1084 www.ti.com SNVS037G – SEPTEMBER 1999 – REVISED JANUARY 2015 7 Detailed Description 7.1 Overview A basic functional diagram for the LM1084-ADJ (excluding protection circuitry) is shown in Figure 11. The topology is basically that of the LM317 except for the pass transistor. Instead of a Darlington NPN with its two diode voltage drop, the LM1084 uses a single NPN. This results in a lower dropout voltage. The structure of the pass transistor is also known as a quasi LDO. The advantage of a quasi LDO over a PNP LDO is its inherently lower quiescent current. The LM1084 is ensured to provide a minimum dropout voltage of 1.5-V over temperature, at full load. Figure 11. Basic Functional Diagram for the LM1084, Excluding Protection Circuitry 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Ripple Rejection Ripple rejection is a function of the open loop gain within the feed-back loop (refer to Figure 11 and Figure 14). The LM1084 exhibits 75dB of ripple rejection (typ.). When adjusted for voltages higher than VREF, the ripple rejection decreases as a function of adjustment gain: (1+R1/R2) or VO/VREF. Therefore a 5-V adjustment decreases ripple rejection by a factor of four ( −12dB); Output ripple increases as adjustment voltage increases. Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 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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