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R1515S050B Datasheet(PDF) 6 Page - RICOH electronics devices division |
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R1515S050B Datasheet(HTML) 6 Page - RICOH electronics devices division |
6 / 20 page R1515x 6 TYPICAL APPLICATION C1 R1515x Series VDD VOUT CE GND C2 C1=Ceramic 0.1 µF C2=Ceramic 0.1 µF VOUT TECHNICAL NOTES When using these ICs, consider the following points: Phase Compensation Phase Compensation of the R1515x 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. Connect the capacitor, C1 between VDD pin and GND pin and C2 between VOUT and GND as close 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 R1515x 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 Do not make voltage level of chip enable pin keep floating level, or in between VCEH and VCEL. Otherwise, the output voltage would be unstable or indefinite, or unexpected current would flow internally. |
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