PT4683C

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DC-DC converters are used to convert direct current (DC) electricity from one DC voltage level to another. PT4683C is a synchronous buck converter with ultra-low current noise offering high efficiency and wide input voltage range. It was designed to deliver up to 5A output current using a single inductor solution and is ideal for space-constrained applications requiring low EMI noise.

The main application field of the PT4683C is automotive, industrial, telecom, consumer, and medical applications. It can be used in many communication products like Ethernet Switch, industrial TV/monitoring system, battery-powered products, and Wi-Fi access points. Its ultra-low current noise makes it particularly suitable for communication products to reduce EMI noise and improve EMC performance.

The working principle of the PT4693C is based on the synchronous rectification architecture. It is able to generate a voltage output that features accuracy, stability, fast transient response, and EMC compatibility. The input voltage range spans from 3.3-42V and is suitable for automotive, telecom, consumer, and medical systems for 24V and other high input voltage applications. PT4683C also features programmable switching frequency, power-good function, and programmable soft-start to speed up load transient.

The structural diagram PT4683C is as shown in figure one. It has a control circuit, an internal power MOSFET, an inductor and a Schottky diode. Its control circuit also includes a switching frequency setting circuit, an over current protection circuit, and an output voltage setting circuit. The input voltage will be stepped down by the MOSFET according to the control signal from the comparison between the output reference voltage and the feedback voltage.

The operation process can be seen in figure two. At the beginning of the switch cycle, the MOSFET is conducting and current builds up in the inductor. When the current reaches the pre-set current limit level, the MOSFET turns off. Then the current will decrease till it reaches zero. The swept energy stored in the inductor will flow to the output capacitor through the Schottky diode. Then the output voltage rises till it reaches the output reference voltage and the cycle will start again.

In summary, PT4683C is a wide range input voltage converter with ultra-low current noise ideal for communication products. It offers fast and effective transient response, high efficiency, and EMC compatibility. With its wide input voltage range, high power capability, and a synchronous rectification architecture, PT4683C is a smart choice for automotive, industrial, telecom, consumer, and medical applications.

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