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NCP1117ST33T3G Datasheet(PDF) 11 Page - ON Semiconductor |
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NCP1117ST33T3G Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 17 page NCP1117, NCV1117 www.onsemi.com 11 Figure 27. Constant Current Regulator Figure 28. Slow Turn−On Regulator Figure 29. Regulator with Shutdown Figure 30. Digitally Controlled Regulator Figure 31. Battery Backed−Up Power Supply Figure 32. 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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