LM78L15ACM

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LM78L15ACM Application Field and Working Principle

The LM78L15ACM is a voltage regulator that belongs to the family of linear voltage regulators. It’s a 3-terminal 15V fixed voltage regulator, suitable for a variety of applications, especially low power including local on-card regulation. It consists of adjustable voltage references, a temperature compensated series of pass transistors, an error amplifier, and a few passive components and provides a low noise, very stable output voltage over temperature and supply voltage.

Features of LM78L15ACM Regulator

• High Reliability: 175°C Operating Junction Temperature with 1.5V Maximum Output Voltage Error
• Low Temperature Coefficient: 0.2mV/°C Maximum
• Triple Output Voltage: +5V, +15V and -15V
• External Adjustor for Output Voltage
• Internal Club Regulation
• Thermal Shut-Down Protection
• Performance and Specifications: 37mA Output Current and 8mA Quiescent Current
• Low Ripple: 10mV Maximum

Working Principle of LM78L15ACM Regulator

The working principle of LM78L15ACM regulator is simple. It works by using an external voltage source to power a single, low loss resistor and an adjustable voltage reference amplifier. The voltage reference is typically set to the desired output voltage of the regulator. As the input voltage varies, the output voltage is regulated by the reference amplifier. When the voltage is too low, the regulator output voltage increases. When it is too high, the regulator reduces the output voltage.

The integrated circuits in the 78L15ACM circuit provide temperature compensation for the voltage regulator, allowing for stable output voltage even with temperature changes. The circuit also includes a thermal protection feature, which turns off the regulator to protect it from damage if it is overstressed.

Applications of LM78L15ACM Regulator

The LM78L15ACM regulator is an ideal choice for applications requiring good efficiency at low power levels. It is used in battery-powered systems, such as computer notebooks, cellular phones and portable instruments. The LM78L15ACM can also be used for supplying power for microcomputers, for example with the PDA, miniature audio systems and other low power applications.

The 78L15ACM regulator is also applicable for amplifiers, automotive NAV systems, cellular phones, consumer electronics, hand-held computers, LED displays, medical equipment, modems, portable electronic devices, transceivers and more.

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