L78M08CDT-TR

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Linear voltage regulators are a basic circuit element that is found in a variety of electronic applications. They are designed to produce a constant output voltage from a varying input voltage, despite changes in the load on the output voltage. The L78M08CDT-TR linear voltage regulator from STMicroelectronics is a small, cost-effective solution for providing the regulated output voltage that is needed in these applications. This article will discuss the application field and working principle of the L78M08CDT-TR linear voltage regulator.

The L78M08CDT-TR is a low-dropout (LDO) linear voltage regulator that is designed to provide a stable 5V regulated output voltage from an input voltage that is between 2.5V to 10V. It has a maximum output current of 150mA and an adjustable output voltage that is set using only two external resistors. The device is packaged in a small 3-pin SOT-89 package and provides excellent performance characteristics in terms of transient response, output noise, and line regulation.

The L78M08CDT-TR is designed for a variety of applications, including microcontrollers, memory circuits, and mixed-signal power supplies. It is ideal for applications that require a tightly regulated output voltage and a high efficiency rating, such as portable battery-operated circuits and industrial control systems. Furthermore, the device is also well-suited for use in automotive and mobile applications due to its low power consumption, high PSRR, and low quiescent current.

The working principle of the L78M08CDT-TR is based on the use of a series pass-transistor configuration, whereby the output voltage is regulated by controlling the current flow through the pass-transistor. The input voltage is supplied to the base of the pass-transistor and the output voltage is fed back to the emitter of the pass-transistor. This feedback circuit ensures that the output voltage is maintained at a constant level, regardless of changes in the load current. The output voltage is adjusted by varying the resistance of the two external resistors, which are connected to the regulator’s two control pins.

To ensure an optimum performance from the L78M08CDT-TR, proper design techniques must be employed. The most important aspect is to ensure that the output voltage is correctly wired to the regulator’s feedback pin, as any error in this connection will lead to incorrect regulation. Additionally, the regulator should be supplied with a low-impedance and noise-free power source and sufficient decoupling capacitors should be used to reduce the effect of noise on the output voltage. Finally, the operating temperature range and power dissipation should be taken into consideration, as the device is only rated for operation within its specified temperature range.

The L78M08CDT-TR is a powerful linear voltage regulator that is designed for use in a variety of applications. Its highly efficient output voltage regulation, combined with its small form factor, make it an ideal choice for applications that require a fixed, low-noise and stable output voltage. Furthermore, proper design techniques must be employed to ensure that the device operates within its specified operating temperature range and delivers the desired performance characteristics.

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