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R1500H080B-T1-FE Datasheet(PDF) 6 Page - RICOH electronics devices division |
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R1500H080B-T1-FE Datasheet(HTML) 6 Page - RICOH electronics devices division |
6 / 27 page R1500x NO.EA-151-160701 6 ∗ R1500J (TO-252-5-P2) is the discontinued product as of July, 2016. TYPICAL APPLICATION C1 R1500x Series VDD VOUT CE GND C2 VOUT 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 Make VDD and GND lines sufficient. If their impedance is high, noise pickup or unstable operation may result. Connect a capacitor C1 with a capacitance value as much as 0.47 µF or more between VDD and GND pin, and as 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. |
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