LT1374CT7#PBF

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LT1374CT7#PBF Application Field and Working Principle

PMIC – Voltage Regulators – DC DC Switching Regulators refers to a single-chip power management index and its products related to it. The LT1374CT7#PBF belongs to this kind of products, and it is a dual-mode boost/flyback converter suitable for automotive and industrial applications. In this article, we will introduce the application field of LT1374CT7#PBF and its working principle in details.

Application Field of LT1374CT7#PBF

The LT1374CT7#PBF is a dual-mode boost/flyback converter that has a wide input range from 0.45V to 28V, so it is suitable for automotive and industrial applications. It comes with low quiescent current and a low-noise inductor, which makes it suitable for on-board embedded systems. The LT1374CT7#PBF can be used for powering 1.2V to 3.3V systems from 4.5V or 5V inputs, or it can be used to power 5V systems from 12V or 24V inputs. It can also be used for short-term battery backup applications where the input power is greater than the output power. Moreover, the device has an internal frequency foldback scheme that will shut down the device if the input voltage is too low to sustain operation.

Working Principle of LT1374CT7#PBF

The LT1374CT7#PBF works on the principle of flyback or boost depending on the load conditions. During start-up, the converter operates in flyback mode, where the primary winding current is maximized with a square wave. As the load current increases, the inductor current ramps up linearly and the converter enters boost mode, where the voltage at the primary winding is increased. When the current in the primary winding approaches zero, it returns to zero and the converter re-enters flyback mode. In flyback mode, the primary winding current is minimized, allowing for steady-state operation. In boost mode, the voltage at the primary winding is increased, allowing for higher output voltages.

The LT1374CT7#PBF also incorporates several protection features such as auto-restart, over-voltage, over-current and under-voltage lockout. The device also includes a power good indicator, so the user can monitor the output voltage. In addition, the LT1374CT7#PBF comes with an internal soft-start circuit, which limits inrush current when the device is first powered up.

Conclusion

The LT1374CT7#PBF is an ideal dc-dc switching regulator for automotive and industrial applications due to its wide input range and low quiescent current. It works on the principle of flyback and boost, allowing it to operate efficiently in both modes. Furthermore, the device comes with several protection features, making it a robust and reliable device. The device is highly recommended for applications where high efficiency and low noise operation is desired.

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