R1511x

9

TYPICAL APPLICATIONS

R1511xxxxB

Series

CE

GND

R1511x001C

Series

GND

NOTES CONCERNING EXTERNAL PARTS

Phase Compensation

In the R1511x Series, phase compensation is provided to secure stable operation even when the load current

In case of using a tantalum type capacitor and the ESR (Equivalent Series Resistance) value of the capacitor

is large, the output might be unstable. Evaluate the circuit including consideration of frequency characteristics.

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

characteristics are different. Evaluate the circuit taking actual characteristics into account.

PCB Layout and GND Wiring

pins, and as close as possible to the pins (Please refer to the Typical Application above).

In the case of using HSOP-6J package, please make sure to wire No. 2, No. 3, and No. 5 pins to the GND

plane. Also, in the case of using TO-252-5-P2 package, please make sure to wire No. 2 and No. 3 pins to the

GND plane.

Thermal Shutdown

R1511x contains a thermal shutdown circuit, which stops regulator operation if the junction temperature of

R1511x becomes higher than 160ºC (Typ.). Additionally, if the junction temperature after the regulator being

stopped decreases to a level below 135ºC (Typ.), it restarts regulator operation. As a result the operation of the

thermal shutdown circuit causes the regulator repeatedly to turn off and on until the causes of overheating are

removed. As a consequence a pulse shaped output voltage occurs.

Output Voltage Setting Method (R1511x001C)

R1511x001C can be adjusted the output voltage up to 12.0V by using the external divider resistors. The output

voltage can be calculated by the following equation.

(guaranteed by design).