B5973D

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The B5973D is a DC-to-DC switching regulator from NXP Semiconductor. This switching regulator is suitable for regulating high-output applications such as PoE, high-current automotive applications, and isolated common bus (CAN bus) systems. The B5973D is ideal for use in commercial and industrial applications that require a high efficiency DC-to-DC converter with a wide input-voltage range and fast transient response.

The B5973D is a synchronous step-down DC-DC converter with up to 98% efficiency. Its adjustable output voltage can range from 0.7V to 30V, and it can support output currents of up to 16A and power requirements of up to 480W. The device features a 2MHz switching frequency, protection features such as overvoltage protection and an overload current monitor, and an integrated current-mode PWM controller with external loop compensation. The B5973D is also designed with low-noise operation in mind, with a proprietary low-noise inductor that operates at low current ripple and a low-noise input capacitor.

The working principle of the B5973D is simple. As an input voltage is applied to the device, a power switch and an inductor, both connected with the output, form a DC-DC switching circuit. As the switch is opened, it initiates a current flow from the input voltage source through the inductor. When the switch is closed, the stored energy from the inductor is transferred to the output node.

The B5973D also includes additional features for accurate control over the switching frequency and the device\'s power output. It integrates an enable pin that allows for power-stable modes, enabling an efficient shutdown of the device when it reaches the end of its lifecycle. The device also features programmable soft start, which allows the user to customize the DC-to-DC converter\'s start-up speed. The B5973D also offers protection features such as cycle-by-cycle current limit, which prevents overload conditions, and a programmable overvoltage (OVP) window.

The B5973D is well-suited for applications that require high performance and a wide input voltage range. The device is ideal for a multitude of applications such as power over Ethernet systems, automotive applications, and isolated common bus systems. It is designed to the highest industry standards and is RoHS compliant.

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