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SI-3120KM-TL Datasheet(PDF) 5 Page - Allegro MicroSystems |
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SI-3120KM-TL Datasheet(HTML) 5 Page - Allegro MicroSystems |
5 / 9 page SI-3120KM 1 A, Low-Dropout, 12 V Regulator www.allegromicro.com Linear Regulators 5 APPLICATIONS INFORMATION Input Capacitor (C I, ≥22 µF). This is necessary either when the input line includes inductance or when the wiring is long. Output Capacitor (C O, ≥47 µF). This device is not designed for a use with a very low ESR output capacitor such as a ceramic capacitor. Output oscillation may occur with that kind of capacitor. The recommended ESR is 0.2~2 Ω at T A = 25°C. Reverse-Bias Protection Diode (D1). Diode D1 provides reverse-bias protection between the input and output. Sanken type SFPL-52 is recommended. ENABLE Input. The ENABLE (control) input features an internal pull-down resistor. Leaving this input open causes the output to turn off. Parallel Operation. Parallel operation to increase load current is not permitted. TYPICAL CHARACTERISTICS (cont.) (VI = 14 V, TA = 25°C) Overvoltage Protection GND Pin Current Increased Output Voltage. The output voltage (V O) may be increased by inserting a resistor (R EXT) between SENSE and OUTPUT. The current flowing into SENSE is typically 90 µA ±30%. To minimize the effect of I SENSE and temperature on R EXT, it is recommended that a 24 kΩ resistor be added between SENSE and GND to increase the current in R EXT. The value of REXT is then R EXT = (VO – 12) × 10 6 /600 |
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