UCC28704DBVR-1 Integrated Circuits (ICs)

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The PMIC - AC DC Converters, Offline Switchers can be further classified with the UCC28704DBVR-1 application field and working principle. UCC28704DBVR-1 is a microprocessor- and logic-controlled, synchronous buck converter. Channels 3 & 4 belong to the low-side synchronous buck, and the channels 1 & 2 are integrated with high-side synchronous buck for space-limited application. In order to minimize the number of external components, high-side and low-side implementations can be achieved by using a single switch. The high-side and low-side integrated solution improves the efficiency of the overall design.

The UCC28704DBVR-1 is designed to deliver up to 1.5A of output current per channel. The device has both over-current limit and over-voltage protection functions. The over-voltage protection limits the output voltage to the programmed voltage limit, while the over-current limit protection limits the current to a programmed limit. With a maximum input voltage of 40V, UCC28704DBVR-1 is suitable for medium-to-high power applications as well.

The UCC28704DBVR-1 uses a control scheme that eliminates the need for an external control resistor, making layout and assembly easier. The control scheme also simplifies the startup of the converter, eliminating the need for a slow start sequence. This technique achieves single-cycle transient response and fast turn-on time. The output voltage of a synchronous buck converter can be accurately regulated by controlling the on/off time of the switch. It uses pulse-width modulation (PWM) control to maintain the output voltage at the regulated level by constantly altering the switch conduction time. The switching frequency of the converter is adjustable from 200kHz to 1MHz.

The UCC28704DBVR-1 contains various features that enable the device to achieve a wide range of application needs. Among them are under-voltage lockout, soft-start, programmable slew rate control, programmable over-current and over-voltage protection, and programmable current-limit functions. The under-voltage lockout feature prevents the device from being powered up with an input voltage lower than a certain limit. This ensures that the device does not operate during a lower input voltage condition and holds the switch in the off-state to maintain safety.

The current-limit feature helps to protect the load in short-circuit conditions by limiting the output current to a certain level. The programmable over-voltage protection feature prevents the output voltage from exceeding the rated voltage limit by limiting the duty cycle. The soft-start feature helps to reduce the output current by reducing the duty cycle when the device starts. The programmable slew-rate control and output freeze functions are also integrated in this device. These features reduce voltage transients, reduce stress on parts, and improve efficiency.

The UCC28704DBVR-1 can be applied to a variety of power management applications, such as LED and UPS power supplies, DC-DC converter for automotive applications, open-frame AC/DC and DC/DC converters, military, automotive and industrial applications. The features of UCC28704DBVR-1 make it a versatile solution for applications with medium to heavy load power requirements.

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