NCP571, NCV571

http://onsemi.com

7

APPLICATIONS INFORMATION

A typical application circuit for the NCP571 series is

shown in Figure 2.

Input Decoupling (C1)

A 0.1

mF capacitor either ceramic or tantalum is

recommended and should be connected close to the NCP571

package. Higher values and lower ESR will improve the

overall line transient response.

Output Decoupling (C2)

The NCP571 is a stable Regulator and does not require

any specific Equivalent Series Resistance (ESR) or a

minimum output current. Capacitors exhibiting ESRs

ranging from a few m

W up to 3.0 W can thus safely be used.

The minimum decoupling value is 0.1

mF and can be

augmented to fulfill stringent load transient requirements.

The regulator accepts ceramic chip capacitors as well as

tantalum devices. Larger output capacitors can be used

without fear of instabilities. Larger values improve noise

rejection and load regulation transient response.

Enable Operation

The enable pin will turn on or off the regulator. These

limits of threshold are covered in the electrical specification

section of this data sheet. If the enable is not used then the

leave this pin on air. In case the voltage of Enable signal is

higher then Input voltage of NCP571 device it is necessary

add an resistor divider in order to keep voltage at Enable pin

bellow Input voltage. A single gate device of VHC family

could be used for this logic level translation. The NL17SZ06

device could be chosen for non inverting open−drain buffer

as shown in Figure 19. Other possibility is using NL17SZ16

device as shown in Figure 20. More information is

mentioned in Application Note AND8101/D.

Figure 19.

Enable

GND

Enable

NC

GND

GND

0.1

mF

NL17SZ06

3.3 V

NCP571

0.1

mF

3.3 V

0 V