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UPD121W33AT1F-E1-AT Datasheet(PDF) 5 Page - NEC |
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UPD121W33AT1F-E1-AT Datasheet(HTML) 5 Page - NEC |
5 / 16 page Data Sheet G18852EJ1V0DS 5 μ PD121WxxA Series CIN : 0.1 μ F or higher. Be sure to connect CIN to prevent parasitic oscillation. Set this value according to the length of the line between the regulator and the INPUT pin. Use of a film capacitor or other capacitor with first-rate voltage and temperature characteristics is recommended. If using a laminated ceramic capacitor, it is necessary to ensure that CIN is 0.1 μ F or higher for the voltage and temperature range to be used. COUT : 10 μ F or higher. Be sure to connect COUT to prevent oscillation and improve excessive load regulation. Place CIN and COUT as close as possible to the IC pins (within 1 to 2 cm). Also, in case of using a laminated ceramic capacitor, please note following items. • It is necessary to ensure that COUT is 10 μ F or higher for the voltage and temperature range to be used. • In case of using laminated ceramic capacitor, it is easy to become state of parasitic oscillation. Because ESR of laminated ceramic capacitor is very low. Therefore, the capacitor and load condition (output current) which fulfill the condition of the stable operation area of ESR shown below are recommended. • Stable Operation Area as below is regulated under condition of which this product is not on a substrate. Therefore impedance on substrate is not considered. D1 : If the OUTPUT pin has a higher voltage than the INPUT pin, connect a diode. D2 : If the OUTPUT pin has a lower voltage than the GND pin, connect a Schottky barrier diode. R1, R2: The total amount of R1 and R2 is sure to below 500 k Ω (375 kΩ TYP.). R2 = 100 kΩ is recommended. VOUT = (1 + R1/R2) VADJ Note Note When VOUT = 3.0 V: R1 = 275 k Ω, R2 = 100 kΩ Caution Make sure that no external voltage is applied to the OUTPUT pin. μ PD121WxxA Series COUT ESR Stable Operation Area 10 1 0.1 0.01 0 150 300 450 600 750 900 1050 1200 1350 1500 IO (mA) Unstable Operation Area Unstable Operation Area Stable Operation Area |
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