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R1152N084B Datasheet(PDF) 6 Page - RICOH electronics devices division |
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R1152N084B Datasheet(HTML) 6 Page - RICOH electronics devices division |
6 / 21 page R1152N 6 OPERATION In these ICs, fluctuation of Output Voltage, VOUT is detected by the feed-back registers, and the result is compared with a reference voltage with the error amplifier and control the base current of an external PNP transistor so that a constant voltage is output. The base current is monitored with the base current limit circuit. If the base current may be too large, the protection circuit works. TECHNICAL NOTES When using these ICs, consider the following points: Make VDD and GND lines sufficient. When their impedance is high, noise pickup or unstable operation may result. When you choose an external transistor, select with considering output current, input voltage, and power dissipation. Generally, low VCE(SAT) and hFE range from 100 to 300 are the appropriate characteristics. In these ICs, phase compensation is made for securing stable operation even if the load current is varied. For this purpose, be sure to use a 10 µF or more output capacitor, as close as possible to the ICs. If you choose an electrolytic capacitor, ESR shift by temperature should be small. If you choose a ceramic capacitor, add an appropriate series resister. If the set output voltage is less than 4.0V, and IOUT>1A must be obtained, at least VIN≧5.0V is the appropriate condition. (Supposed as hFE =100) Voltage level for CE should not be floating, or middle range voltage. If the CE voltage is not appropriate, output voltage may be unstable or conduction current may flow. All external components should be located as close as possible to the IC, and wiring should be as short as possible. If hFE value of the PNP transistor is too high, output voltage may rise at low load current (less than 1mA). |
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