NCP1117XT50 datasheet(10/16 Pages) ONSEMI

Part #	NCP1117XT50

Description	1.0 A Low-Dropout Positive Fixed and Adjustable Voltage Regulators

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NCP1117, NCV1117

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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

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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