UCC28780D

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Power management integrated circuit (PMIC) is a type of integrated circuit (IC) which manages the power in the electronic systems. It has become an increasingly important component in modern electronics because it ensures reliable operation of the whole system. UCC28780D is a low-cost, low-voltage, synchronous rectifier buck controller from Texas Instruments. It is designed to provide efficient conversion of a wide input voltage range (4 V to 17 V) to adjustable output voltages for medium power applications up to 28 V and 4 A. It operates in pulse-width-modulated (PWM), current-mode control providing a fast transient response for DC-DC converters. This device also features protection functions, such as over-voltage, over-temperature protection, enable and soft-start.

UCC28780D Application Field and Working Principle

UCC28780D IC is often used in modern application related power supply systems. It provides the efficiency, accuracy, and flexibility that make it suitable for automotive, commercial, industrial, and other applications. In addition, it is suitable for off-line switchers, isolated and non-isolated DC-to-DC converters, power-factor-correction (PFC) converters, and secondary side offline regulation.

The UCC28780D uses a synchronous rectifier buck controller to regulate the output voltage. The major function of this IC is to convert a wide input voltage range (4 V to 17 V) to adjustable output voltages. In the process, it consumes the least amount of energy by switching between Pulse Width Modulation (PWM) and Current Mode Control modes. This works by adjusting an internal oscillator to get an exact frequency based on the desired output voltage. Furthermore, it allows to adjust the power efficiency and frequency of switching. As the MOSFET switch is being turned on and off, the voltage is being regulated.

Pulse width modulation is used to adjust the ratio between the on-time and the off-time of the MOSFET switch. This frequency is usually between 300 KHz and 20 MHz. In order to compensate the switching losses in the MOSFET, UCC28780D uses current-mode control. This enables it to not only adjust the amount of power consumed by the internal clock but also reduces the voltage dropping and trashing times of the output voltage. Moreover, UCC28780D features several protection functions such as over-voltage protection, over-temperature protection and enable controls.

UI protections include over-voltage protection (OVP), under-voltage lockout (UVLO), over-temperature protection (OTP) and other functions. OVP ensures that the output voltage does not exceed the manufacturer\'s specified limit at any given time, while UVLO prevents the controller from working when the input voltage is too low. OTP helps to protect the circuitry by shutting down the controller when the device temperatures rise above a certain limit.

The UCC28780D also includes a soft start function, which helps it regulate the ramp-up rate of the output voltage when the controller is first turned on. To prevent against short-circuit and over-current conditions, the device also contains an over-current detection and a short-circuit protection. These two features help the controller to respond quickly to unexpected surges of current and shut down the circuit in the event of a short.

In conclusion, UCC28780D is an excellent choice for PMIC applications in modern power systems, especially those related to AC DC converters, offline switchers and non-isolated DC to DC converters. It provides efficient and accurate power conversion with adjustable output voltages and flexible protection functions. This device is also easy to use and program, making it ideal for a wide range of applications.

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