RP200x

9

TYPICAL APPLICATION

C1

RP200x

Series

CE

GND

AE

C2

(External Components)

C1, C2 : Ceramic Capacitor

1.0

μF

MURATA: GRM155B31A105KE15

TECHNICAL NOTES

When using these ICs, consider the following points:

Phase Compensation

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

this purpose, use a capacitor C2 with 1.0

μF 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 these ICs with as same external

components as ones to be used on the PCB.)

PCB Layout

Connect a capacitor C1 with a capacitance value as much as 1.0

close as possible to the pins.

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

as short as possible.

Impedance of Input Pin (CE Pin and AE Pin)

In those ICs, there is a pull-down constant current in the CE Pin and the AE Pin.

However, if those pins are floating and wired long that produce the noise environment, it might miss-operation of

ICs. For this purpose, please make sure enough evaluation of ICs.

＊RP200Q (SC-88A) is the discontinued product. As of March in 2015.