RP114x

No.EA-236-220901

10

TECHNICAL NOTES ON EXTERNAL COMPONENTS

When using these ICs, consider the following points:

Phase Compensation

In this IC, phase compensation is made for securing stable operation even if the load current is varied. For this

purpose, use a capacitor C2 with 1.0µF or more and good ESR (Equivalent Series Resistance).

(Note: If additional ceramic capacitors are connected with parallel to the output pin with an output capacitor for

phase compensation, the operation might be unstable. Because of this, test this IC with as same external

components as ones to be used on the PCB.)

PCB Layout

Make VDD and GND lines sufficient. If their impedance is high, noise pickup or unstable operation may result.

Connect a capacitor C1 with a capacitance value as much as 1.0µF or more between VDD and GND pins, and

as close as possible to the pins.

Set external components, especially the output capacitor C2, as close as possible to the IC, and make wiring

as short as possible.

Typical Application Circuit

C1

1.0 µF

RP114x

Series

VDD VOUT

CE

GND

C2

1.0 µF

VOUT

CE Control