RP112K331B datasheet(7/32 Pages) RICOH

7 / 32 page

RP112x

NO.EA-258-131024

TYPICAL APPLICATIONS

RP112x

Series

VDD

VOUT

GND

VOUT

External Parts Example:

C1, C2: Ceramic Capacitor 1.0µF, Murata, GRM155B31A105KE15

TECHNICAL NOTES

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 1.0

μF or more capacitor C2.

In case of using a tantalum capacitor, the output may be unstable due to inappropriate ESR. Therefore, the full

range of operating conditions for the capacitor in the application should be considered.

PCB Layout

The high impedances of VDD and GND could be a reason for the noise pickup and unstable operation.

Therefore, it is imperative that the impedances of VDD and GND be the lowest possible. Also, place a 1.0µF or

more capacitor (C1) between VDD pin and GND pin as close as possible to each other.

As for C2 output capacitor that is used for phase compensation, place it between VOUT pin and GND as close

as possible to each other (Refer to TYPICAL APPLICATIONS).

RP112K331B 数据表(PDF) 7 Page - RICOH electronics devices division