L5956PD

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L5956PD Application Field and Working Principle

The L5956PD is a specialized integrated monolithic voltage regulator belonging to the family of Linear Technology. It is produced as a surface-mounted device (SMD) for use with a stabilized external power supply. This specific voltage regulator unit is used to generate a well-regulated output voltage of 375V, 375mA from a highly fluctuating input voltage of 3V-14V.

The L5956PD is typically used in special-purpose applications and the direct connection of resistor-divided resistance bridge in comparator circuitry, especially in the field of telephone switching, medical instruments and automation industrial control. It can also be used as a fixed voltage center tap regulator.

Output Voltage Settings

The output voltage of the L5956PD voltage regulator is adjustable between 375V and 375mA. The output can be adjusted by simply adding a resistor between the ADJ pin and ground. The output voltage of the voltage regulator is determined by the equation:

V_OUT = 1.25V x (1+R_ADJ/R FB )

Working Principle

The L5956PD voltage regulator is composed of a standard linear, three-terminal device with a gain stage providing an adjustable output voltage. It consists of two series connected power bipolar transistors and an adjustable output voltage Divider along with two series connected Schottky rectifiers at its output.

The voltage regulator integrates a current source providing regulated current at its output, thus maintaining the output voltage constant within the input voltage normal range. This Vce (Collector-Emitter voltage) exhibits high stability with temperature and input voltage fluctuations, hence ensuring accuracy and uniformity in the output voltage.

The Vce of the regulator also has a wide differential voltage range as compared to a standard voltage regulator. This range is important to ensure the stability of the regulator over a wide range of input voltages. In addition, the current source of the L5956PD has several advantages over a standard linear voltage regulator due to the fact that it is less prone to oscillations and can provide improved noise rejection.

Advantages

The L5956PD brings many advantages to the table when compared to similar voltage regulator devices. One such advantage is its excellent output voltage stability. The voltage regulator has a low DC output impedance, which ensures that the output voltage does not become significantly affected by varying loads and input voltages. Its considerable efficiency means that the L5956PD can handle large power loads with very little power dissipation when compared to traditional linear voltage regulators.

Another key feature of the L5956PD is excellent temperature stability. This means that the output voltage of the voltage regulator remains relatively constant even within a wide range of temperature environments, allowing it to be used in various industrial applications. Finally, the L5956PD has a built-in thermal foldback protection that shuts off the output when the temperature of the device exceeds a certain limit, which further enhances its reliability.

Limitations

The current generated by the voltage regulator is limited to 375mA. This could pose an issue for applications requiring high currents, such as motor control systems.

The voltage regulator also has a limited input voltage range. Its maximum input voltage is 14V, and its minimum input voltage is 3V. This could be an issue in applications that require a wide range of input voltages, such as solar panel systems.

Finally, the L5956PD voltage regulator has a low-noise output, which could be an issue in applications that require a very high level of noise reduction.

Conclusion

The L5956PD is a specialized monolithic voltage regulator with excellent output voltage stability and temperature stability. It is used in special-purpose applications and the direct connection of resistor-divided resistance bridge in comparator circuitry. Its advantages include excellent output voltage stability, excellent temperature stability, and built-in thermal foldback protection, making it ideal for industrial applications. However, its current limitations and input voltage range could be an issue for some applications.

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