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LM317SX/NOPB 数据表(PDF) 21 Page - Texas Instruments |
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LM317SX/NOPB 数据表(HTML) 21 Page - Texas Instruments |
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21 / 51 page ![]() LM117 LM117 21 LM117, LM317-N www.ti.com SNVS774Q – MAY 2004 – REVISED JUNE 2020 Product Folder Links: LM117 LM317-N Submit Documentation Feedback Copyright © 2004–2020, Texas Instruments Incorporated Typical Applications (continued) 9.2.7 Emitter-Follower Current Amplifier The LM117 is used as a constant current source in the emitter follower circuit (see Figure 25). The LM195 power transistor is being used as a current gain amplifier, boosting the INPUT current. The LM117 provides a stable current bias than just using a resistor. Figure 25. Emitter-Follower Current Amplifier 9.2.8 1-A Current Regulator A simple, fixed current regulator can be made by placing a resistor between the VOUT and ADJ pins of the LM117 (see Figure 26). By regulating a constant 1.25 V between these two terminals, a constant current is delivered to the load. Figure 26. 1-A Current Regulator |
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