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UA723CDRE4 Folha de dados(PDF) 10 Page - Texas Instruments |
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UA723CDRE4 Folha de dados(HTML) 10 Page - Texas Instruments |
10 / 21 page µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION R2 VI 15 pF 2N5004 1 k Ω (see Note A) R1 2N3997 1N4005 1 M Ω 100 µF 1 k Ω 220 Ω 0.1 µF L = 1.2 mH (see Note B) REF VCC+ VC OUTPUT VZ CURR LIM CURR SENS IN+ VCC– FREQ COMP IN– µA723 NOTES: A. The device requires a minimum of 9 V between VCC+ and VCC– when VO is equal to or more positive than –9 V. B. L is 40 turns of No. 20 enameled copper wire wound on Ferroxcube P36/22-3B7 potted core, or equivalent, with a 0.009-inch air gap. Regulated Output, VO R3 = 3 k Ω R4 = 3 k Ω Figure 10. Negative Switching Regulator 1000 pF VI 2 k Ω Input From Series 54/74 Logic 2 k Ω 2N4422 R1 R2 REF VCC+ VC OUTPUT VZ CURR LIM CURR SENS IN+ VCC– FREQ COMP IN– RSC µA723 NOTE A: A current-limiting transistor can be used for shutdown if current limiting is not required. Regulated Output, VO Figure 11. Remote Shutdown Regulator With Current Limiting |
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