UCC25701DTR Integrated Circuits (ICs)

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

The UCC25701DTR is a high voltage, constant-frequency, hysteretic-mode, offline primary-side regulated (PSR) switch-mode power supply (SMPS) controller. It is designed to provide a low component count solution to meet the most common requirements of offline flyback and forward converter applications. The UCC25701DTR is optimized for LED lighting applications, but is also suitable for general purpose offline SMPS. This device is used in applications ranging from 5 V to 375 V for AC to DC solutions.

The UCC25701DTR features an adaptive control system that continuously optimizes for the best tradeoff between efficiency and line regulation. It does this by controlling the on-time of the power MOSFET based on the voltage sense of the primary winding of the power transformer. The UCC25701DTR is also equipped with an overvoltage protection circuit that will turn off the power MOSFET once the sensed voltage exceeds the reference voltage, as well as a light-load-mode to ensure minimal standby current.

The primary aspect of the UCC25701DTR is its hysteretic-mode control operation. This operation mode provides the user with simple and efficient voltage regulation, while reducing the number of components needed. This mode of operation is achieved by continuously monitoring the current in the primary winding of the power transformer and adjusting the on-time of the power MOSFET accordingly. The hysteretic-mode allows the UCC25701DTR to maintain a stable output voltage in the presence of transformer and output load variation.

The UCC25701DTR combines with an Opto-Coupler and a Drive Transistor in the Feedback Loop to control the power MOSFET. The Opto-Coupler provides the necessary isolation for secondary feedback and the Drive Transistor serves as a buffer between the Opto-Coupler and the output stage. The UCC25701DTR includes a number of features that make it suitable for a wide range of AC/DC power supply applications.

The UCC25701DTR integrates an under-voltage lockout (UVLO) circuit that turns off the power FET when the input voltage is below a predetermined level. This allows the UCC25701DTR to remain in standby mode until the voltage reaches the correct operating level, saving energy and preventing premature shutdown of the system. The Device also includes internal soft start and constant current limit functions that protect both the output voltage and the input circuit from overloading.

In addition to its hysteretic-mode of operation, the UCC25701DTR offers a pulse-skipping mode for light-load conditions. This feature can be used to maintain efficiency in the device over a wide range of input and output voltages. Furthermore, the UCC25701DTR includes an overvoltage protection circuit that senses an over-voltage condition and disables the output to protect from unnecessary power losses.

The UCC25701DTR is a robust and efficient tool for AC/DC power supply applications such as compact consumer electronics, for example TVs and monitors, as well as lighting. With the constant frequency high voltage method and the hysteretic control technology, the UCC25701DTR eliminates the need for high-frequency controllers, reducing overall cost and complexity of the system. It is also highly suitable for lighting applications, where the user needs to ensure no-load power consumption while still maintaining a steady output.

The specific data is subject to PDF, and the above content is for reference