R1514x

6

TYPICAL APPLICATION

C1

R1514x

Series

CE

GND

C2

C1=Ceramic 0.1

µF

C2=Ceramic 0.1

µF

TECHNICAL NOTES

When using these ICs, consider the following points:

Phase Compensation

Phase Compensation of the R1514x Series has been made internally for stable operation even though the

load current would vary. Therefore, without the capacitors, C1 and C2, the output voltage is regulated, however,

for more stable operation, use capacitors as C1 and C2. Especially, if the input line is long and impedance is high,

C1 is necessary. Moreover, if you use rather large C2, transient response will be improved. Recommended value

is in the range from 0.1

µF to 10µF. Wiring should be made as short as possible.

GND wiring of mounting on board

No.2 pin and No.4 pin of SOT-89-5 package must be wired to the GND plane. No.2 pin, No.4 pin and No.5 pin

of HSOP-6J package must be wired to the GND plane when it is mounted on board.

Thermal Shutdown

Thermal shutdown function is included in the R1514x Series, if the junction temperature is equal or more than

+150

°C(Typ.), the operation of regulator would stop. After that, when the junction temperature is equal or less

than +125

°C(Typ.), the operation of regulator would restart. Unless the cause of rising temperature would

remove, the regulator repeats on and off, and output waveform would be like consecutive pulses.

Chip Enable Circuit

output voltage would be unstable or indefinite, or unexpected current would flow internally.