SG117K-JAN

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SG117K-JAN Application Field and Working Principle

SG117K-JAN is a low-dropout three-terminal regulator which is designed for medium-power, low-voltage applications. It is a highly efficient, monolithic linear voltage regulator that provides excellent regulation and extremely low dropout voltage. SG117K-JAN is suitable for medium current applications, and its small size allows it to be ideal for space-saving designs.

Features of SG117K-JAN

• Low dropout voltage: 0.3V TYP. @ 1A
• High-efficiency integrated circuit
• Current limit transistor built-in
• Low voltage operation: 1.3V (TYP.)
• High-temperature operation: +125℃ (MAX.)

Applications of SG117K-JAN

• Minicomputers
• Portable instruments and hand-held systems
• Battery-operated systems
• Polyphonic music synthesizers and digital pianos.

Working Principle of SG117K-JAN

SG117K-JAN is a three-terminal linear voltage regulator. It is composed mainly of two transistors, two resistors and two capacitors. The two transistors are NPN and PNP type, respectively. When the voltage at the control terminal (Vctl) is lower than the voltage at the output terminal (V out), the PNP transistor turns on. This causes current to flow from the Vctl terminal through the PNP trunk and resistor to the V out terminal. The voltage at the Vctl terminal increases, and the PNP transistor turns off. At the same time, the NPN transistor turns on and current flows from the Vctl terminal to ground. This causes the voltage at the Vctl terminal to decrease, and the NPN transistor turns off. This cycle continues, and the voltage at the output terminal remains constant. The two capacitors help filter out any sudden changes in load or input voltage.

Conclusion

SG117K-JAN is a low-dropout three-terminal linear voltage regulator that can provide excellent regulation with extreme low dropout voltage. Its small size and high efficiency make it ideal for space-saving designs, while its low voltage operation and high temperature operation make it suitable for a variety of applications including minicomputers, portable instruments, battery-operated systems, and more. Its working principle is based on a NPN and PNP transistor, two resistors, and two capacitors that allow it to regulate the voltage and rectify any sudden changes in load or input voltage.

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