PT4833C

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DC-DC converters are ideal for applications such as step-down, step-up, isolated and non-isolated dc-dc power designs which require an intermediate energy transfer between sources. The PT4833C is a high-efficiency, high-frequency, AC-DC step-down switching regulator designed for applications ranging from low-power portable devices to high-power industrial systems. This converter is suitable for applications with 5V to 24V DC inputs, offering stable and adjustable outputs of 0.6V to 5V DC.

The PT4833C uses a non-isolated step-down topology with synchronous rectification to cycle between its high and low sides. The device implements a fixed-frequency pulse width modulation (PWM) control scheme with a 30kHz operating frequency. The maximum output current of the converter is 3A, and the efficiency of the device is >90%.

In addition to its outstanding efficacy, the PT4833C also offers several comprehensive protection features and operational modes. It incorporates built-in current limit protection and voltage limit protection to ensure stable operation and protect load circuitry from shorts. In addition, the converter has an integrated soft start control to reduce inrush current of the output when the converter is first powered on. The PT4833C can also be programmable with frequency synchronization or external clock, which allows users to synchronize multiple converters.

The PT4833C operating principle is actually quite simple. During its operating cycle, the high side and low side MOSFETs alternately switch on and off in response to a fixed switching frequency. As one of the MOSFETs is turned on, the inductor acts as a current source and charges up the output capacitor. As the inductor energy is depleted, the current gradually drops to zero, and the opposite MOSFET turns on, creating a synchronous rectification. This allows the output capacitor to discharge, completing the cycle.

Because of its exceptional features and versatility, the PT4833C converter is an ideal choice for applications that require intermediate energy transfers between power sources, such as distributed power systems, telecom systems, motor drives, LCD televisions, and many more. With its high efficiency, wide operating range, comprehensive protections and flexibility, the PT4833C certainly meets the demands of a vast range of applications.

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