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LM317S/NOPB 数据表(PDF) 17 Page - Texas Instruments |
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LM317S/NOPB 数据表(HTML) 17 Page - Texas Instruments |
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17 / 51 page ![]() LM317-N 17 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) 9.2.1.3 Application Curve As shown in Figure 19, VOUT will rise with VIN minus some dropout voltage. This dropout voltage during startup will vary with ROUT. Figure 19. VOUT vs VIN, VOUT = 5V 9.2.2 5-V Logic Regulator With Electronic Shutdown Figure 20 shows a variation of the 5-V output regulator application uses the L117 along with an NPN transistor to provide shutdown control. The NPN will either block or sink the current from the ADJ pin by responding to the TTL pin logic. When TTL is pulled high, the NPN is on and pulls the ADJ pin to GND, and the LM117 outputs about 1.25 V. When TTL is pulled low, the NPN is off and the regulator outputs according to the programmed adjustable voltage. NOTE: Min. output ≊ 1.2 V Figure 20. 5-V Logic Regulator With Electronic Shutdown |
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