UCC3801DG4

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The UCC3801DG4 is a single-ended, primary-side envelope switching controller for Pulse Width Modulation (PWM) based DC-DC converters. It is an industry-leading device that combines an array of advanced features with a small package size. This makes it ideal for applications where space is an issue and performance is paramount.

The UCC3801DG4 is designed to operate in both the discontinuous and continuous conduction modes, and its switching frequency is adjustable or can be synchronized to an external clock. It features a programmable soft-start, adjustable dead-time, pulse-by-pulse output current limitation, thermal shutdown, and a programmable slow start-up mode.

The UCC3801DG4 is designed to control a wide variety of high frequency DC-DC converters, including buck, boost, flyback, forward, bridge, and push-pull designs. It can also be used to control various AC-DC converter topologies. Its low autotransformer voltage drop and high efficiency make it suitable for higher power systems.

In addition to its PWM control, the UCC3801DG4 also includes feed-forward control which uses an internal comparator to feedback the output current level of the converter in order to improve transient response. This feature can be disabled if not required.

The UCC3801DG4 is based on a non-insulated floating-DRAIN structure and can be configured for either single-ended or push-pull operation, making it suitable for a wide range of topologies. Its wide Vin and Vout ranges, along with its low quiescent current make it an ideal choice for battery-powered applications. In addition, the UCC3801DG4 has a selectable power-saving mode to further extend the battery life.

The UCC3801DG4 utilizes an integrated low-side MOSFET and an external high-side MOSFET to control the output power of the DC-DC converter. It monitors the primary current of the converter and generates a PWM signal to control the duty cycle of the MOSFET in order to regulate the output power. The duty cycle can be programmed to any desired value using an external potentiometer.

The UCC3801DG4 has a wide range of applications, including motor control, ac-dc converters, battery-powered systems, renewable energy systems, and automotive applications. Its wide operating frequency range, programmable parameters, low quiescent current, and low autotransformer voltage drop make it an ideal solution for these applications.

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