MC7815CDTG

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The MC7815CDTG is a linear voltage regulator used within the broad range of Power Management ICs (PMICs) from ON Semiconductor. This device offers fixed output voltage between 5V and 24V and evaluates the bandgap device to offer voltage accuracy of 1% over temperature and line variations. It is an easy to use device which includes many excellent features, allowing designs to meet the toughest performance requirements for advanced, personal hand-held and mobile radio applications.

Application field

The main application fields of MC7815CDTG include desktop personal computers, battery-backed systems, AC/DC converters, isolated DC/DC converters and power supplies. It also supports some specialized applications like TVs, audio products, motor speed control and others. This device is designed to provide an excellent cost-to-performance ratio and simplifies dc/DC conversion, enabling designers of low-power systems to produce superior results with minimal design effort.

Working principle

The MC7815CDTG is a linear regulator that uses a PNP bipolar transistor as a power transistor. It works on a standard 78xx voltage regulation circuit as shown in Figure 1. The voltage divider decreases the input voltage to a suitable level for the zener diode. The zener diode DZY then provides a reference voltage. This reference voltage is compared to the output voltage by the error amplifier. Whenever the output voltage drops below the reference voltage, the error amplifier drives the PNP transistor, and the current flows through the PNP transistor to the output, thus increasing the output voltage. The output maintains a constant voltage until the input voltage drops below the reference voltage.

Figure 1: Standard 78xx Voltage Regulation Circuit

The regulating characteristics of the MC7815CDTG are summarized in Figure 2. The maximum output current capability is limited by the available power dissipation. When the ambient temperature is above 50°C, the output current should be reduced by approximately 30% to maintain the thermal rating of the device. The output voltage of the device is internally preset and may be adjusted with two external resistors. The MC7815CDTG provides an excellent load regulation, line regulation, and a low operating temperature coefficient.

Figure 2: Regulating Characteristics of MC7815CDTG

The MC7815CDTG is designed to provide an efficient and reliable voltage regulator solution in a wide range of applications from battery-backed systems, AC/DC converters, isolated DC/DC converters, and power supplies. This device is easy to use and offers superior performance as compared to other voltage regulator options. Moreover, it also offers excellent cost-to-performance ratio, making it an ideal choice for low-power systems.

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