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LR1117D 데이터시트(PDF) 5 Page - Leshan Radio Company |
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LR1117D 데이터시트(HTML) 5 Page - Leshan Radio Company |
5 / 9 page DETAILED DESCRIPTION LR1117 is a series of low dropout voltage, three terminal regulators. Its application circuit is very simple: the fixed version only needs two capacitors and the adjustable version only needs two resistors and two capacitors to work. It is composed of some modules including start-up circuit, bias circuit, bandgap, thermal shutdown, power transistors and its driver circuit and so on. The thermal shut down modules can assure chip and its application system working safety when the junction temperature is larger than 140°C. The bandgap module provides stable reference voltage, whose temperature coefficient is compensated by careful design considerations. The temperature coefficient is under 100 ppm/°C. And the accuracy of output voltage is guaranteed by trimming technique. TYPICAL APPLICATION LR1117 has an adjustable version andsix fixed versions (1.2V, 1.8V, 2.5V, 2.85V, 3.3V, 5V ) Fixed Output Voltage Version Vin Vout Gnd 10uF 10uF Vin Vout LR1117 Application circuit of LR1117 fixed version Adjustable Output Voltage Version LR1117 -ADJ provides a 1.25V reference voltage. Any output voltage between 1.25V~12V can be achievable by choosing two external resistors (schematic is shown below), R1 and R2 Vin Vout ADJ 10uF 10uF Vin Vout R1 R2 Application Circuit of LR1117 ADJ The output voltage of adjustable version follows the equation: Vout=1.25 (1+R2/R1)+IAdj R2. We can ignore IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA). LR1117 -ADJ 1) Recommend using 10uF tan capacitor or MLCC capacitor as bypass capacitor (C1) for all application circuit. 2) Recommend using 10uF tan capacitor MLCC capacitor to assure circuit stability. 3) Capacitor ESR range: 3m ~ 22 5/ LESHAN RADIO COMPANY, LTD. |
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