RP173Q552B-TR-FE datasheet(8/22 Pages) RICOH

8 / 22 page

RP173x

TYPICAL APPLICATIONS

RP173x

Series

VDD

VOUT

GND

VOUT

External Parts Example:

C2: Ceramic Capacitor 0.1µF, Murata,GRM155B31C104KA87D

TECHNICAL NOTES

When using the ICs, please note 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 0.1

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

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 0.1

μF or more between VDD and GND pin, and as

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.

POWER ACTIVATION

If the ICs are started up with VIN and VCE under the no-load condition, the both pin voltages have to be started

up with faster than 2.0V/s. If the IC is started up with slower than 2.0V/s under the no-load condition, start up the

IC only with VCE.

RP173Q552B-TR-FE Datasheet(PDF) 8 Page - RICOH electronics devices division