NCP561

http://onsemi.com

8

Output

R

1

2

3

5

4

Input

1.0

mF

1.0

mF

Output

1

2

3

5

4

Input

1.0

mF

1.0

mF

Q2

Q1

R3

R1

R2

Output

1

2

3

5

4

Input

1.0

mF

1.0

mF

Output

1

2

3

5

4

Enable

1.0

mF

1.0

mF

C

Output

1

2

3

5

4

Input

1.0

mF

1.0

mF

Q1

R

5.6 V

Figure 14. Current Boost Regulator

Figure 15. Current Boost Regulator

with Short Circuit Limit

Figure 16. Delayed Turn-on

Figure 17. Input Voltages Greater than 6.0 V

The NCP561 series can be current boosted with a PNP transist‐

when the pass transistor begins conducting; this circuit is not

short circuit proof. Input/Output differential voltage minimum is

If a delayed turn-on is needed during power up of several

voltages then the above schematic can be used. Resistor R,

and capacitor C, will delay the turn-on of the bottom regulator.

A regulated output can be achieved with input voltages that

exceed the 6.0 V maximum rating of the NCP561 series with

the addition of a simple pre-regulator circuit. Care must be

taken to prevent Q1 from overheating when the regulated

Q1

R

APPLICATION CIRCUITS