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NCP1117DT18RKG Datasheet(PDF) 10 Page - ON Semiconductor |
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NCP1117DT18RKG Datasheet(HTML) 10 Page - ON Semiconductor |
10 / 17 page NCP1117, NCV1117 http://onsemi.com 10 Figure 24. Constant Current Regulator Figure 25. Slow Turn−On Regulator Figure 26. Regulator with Shutdown Figure 27. Digitally Controlled Regulator Figure 28. Battery Backed−Up Power Supply Figure 29. Adjusting Output of Fixed Voltage Regulators The 50 W resistor that is in series with the ground pin of the upper regulator level shifts its output 300 mV higher than the lower regulator. This keeps the lower regulator off until the input source is removed. Resistor R2 sets the maximum output voltage. Each transistor reduces the output voltage when turned on. 1 2 Constant Current Output 3 Input NCP1117 XTA ++ 10 mF Iout + Vref R ) Iadj 10 mF R 1 2 Output 3 Input NCP1117 XTA ++ 10 mF 10 mF 1N4001 R2 R1 10 mF 50 k 2N2907 1 2 Output 3 Input NCP1117 XTA ++ 10 mF 10 mF 120 2N2222 360 1.0 k 1.0 k Output Control On Off 1 2 Output 3 Input NCP1117 XTA ++ 10 mF 10 mF R1 2N2222 R2 1 50 W 2 Output 3 Input NCP1117 XT50 ++ 10 mF 10 mF + RCHG 1 NCP1117 XT50 + 10 mF − 6.6 V 5.3 V AC Line 5.0 V Battery 1 2 Output 3 Input NCP1117 XT50 ++ 10 mF + 10 mF 10 mF 2.0 k 5.0 V to 12 V Vout(Off) + Vref Output Voltage Control 2 3 |
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