LM78S40CN

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The LM78S40CN is a single-output DC-DC power converter integrated module developed by ON Semiconductor, incorporating an efficient buck switching regulator and controller, in-line MOSFETs, inductor, and other active and passive passive components. It provides an output cold start current up to 2A, and it is an ideal choice when space and cost are of primary concern.

Application Field

The LM78S40CN is widely used in power supply systems, such as communications, consumer electronics, and automotive systems. In automotive systems, its main applications include power supply for any electronic device that requires a stable voltage in the 5V to 40V range. It is also used in many battery-operated applications, such as mobile phones, PDAs, portable media players, and other miniaturized electronic devices.

Working Principle

The LM78S40CN is equipped with an external feedback pin, so it will integrate an internal 1.2V voltage reference to provide open-loop current mode controlled power management. In this way, the device can operate without loss, without compromising system reliability. In addition, the LM78S40CN comes with integrated protection features, such as over-voltage, under-voltage, output over-current and thermal protection, so that the device will be automatically disabled when the system reaches dangerous operating conditions and restart when the fault is eliminated.

The LM78S40CN is also able to provide good power rate characteristics, which is essential for high-efficiency applications without the need for external compensation circuits. To improve the power efficiency, the device can enter low power standby mode when the voltage or current decreases to a certain value.

Conclusion

The LM78S40CN is an effective solution for cost and space conscious designs, allowing for a simple, efficient and cost-effective DC-DC power converter. It is suitable for applications such as communication, consumer electronics and automotive systems, providing a good and reliable power management solution.

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