R1500x

NO.EA-151-160701

6

∗ R1500J (TO-252-5-P2) is the discontinued product as of July, 2016.

TYPICAL APPLICATION

C1

R1500x

Series

CE

GND

C2

C1=Ceramic 0.47

µF

C2=Ceramic 10

µF

(External Components)

C2: Ceramic 10

µF MURATA: GRM32DB31E106K (size: 3225)

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 good frequency characteristics and ESR (Equivalent Series Resistance).

If you use a tantalum type capacitor and ESR value of the capacitor is large, output might be unstable. Evaluate

your circuit with considering frequency characteristics.

Depending on the capacitor size, manufacturer, and part number, the bias characteristics and temperature

characteristics are different. Evaluate the circuit with actual using capacitors.

PCB Layout

Connect a capacitor C1 with a capacitance value as much as 0.47

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.

No.2 pin and No.3 pin of SOT-89-5 and TO-252-5-P2 package must be wired to the GND plane when it is

mounted on board.

Thermal Shutdown

There is the built-in thermal-shutdown function in R1500x series. It discontinues operation of the IC when the

junction temperature becomes over 170

°C (Typ.) and IC re-operates when the junction temperature under 145°C.

If the temperature increasing keeps the IC repeats ON and OFF operating. The output becomes the pulse

condition.