NJM2829

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Ver.2011-01-27

TYPICALAPPLICATION

ON/OFF control

ON/OFF control can be achieved by applying positive control voltage to CONTROL terminal.

Apply positive Vcont ("H") to make chip to be ON (Enabled), and either Vcont is "L" or open (High Z) to make chip to

be OFF (Disabled).

The relations between Vcont and the state is as follows:

Vcont +1.6V

≤ Vcont ≤ +5V ("H" level):

ON state

Vcont 0V

≤ Vcont ≤ +0.6V ("L" level):

OFF state

Vcont +0.6V < Vcont < +1.6V ("L" level):

Undefined

In case ON/OFF control is not used, keep applying positive Vcont to CONTROL terminal to make chip ON.

Note that negative Vcont does not make the chip enabled.

CONTROL

GND

0.1µF

2.2µF*3

R

CS

CONTROL

CS

0.047µF

NJM2829

*3) Vo>-0.9V version: Co=4.7

µ F(Ceramic)

resistance "R".

power supply impedance or a long power supply line.

Output capacitor (Co) is required for a phase compensation of the internal error amplifier. The capacitance and the

equivalent series resistance (ESR) influences stability of the regulator.

This product is designed to work with a low ESR capacitor for the Co; however, use of recommended capacitance or

greater value is essential for stable operation.

Use of a smaller Co may cause excess output noise or oscillation of the regulator due to lack of the phase

compensation.

Therefore, use Co with the recommended capacitance or greater value and connect between Vo terminal and GND

terminal with minimal wiring. The recommended capacitance depends on the output voltage. Low voltage regulator

requires greater value of the Co. Thus, check the recommended capacitance for each output voltage.

Use of a greater Co reduces output noise and ripple output, and also improves transient response of the output

voltage against rapid load change.