UCC2809D-1G4

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Power management integrated circuits (PMICs) play an important role as they provide steady, continuous and efficient power supply from a variety of sources. Among these, AC/DC converters, offline switchers and UCC2809D-1G4 are particularly important for providing the necessary power for electronics. This article covers the application fields and working principles of the UCC2809D-1G4.

The UCC2809D-1G4 is specifically designed for offline switch Mode Power Supply (SMPS) topologies and is designed to drive a flyback converter. It has built-in features that provide protection from over-voltage, over-temperature and over-current. The internal function block and features of UCC2809D-1G4 make it suitable for isolated and non-isolated Flyback converters, Buck converters, and Boost converters.

UCC2809D-1G4 is a highly integrated ultra-low power PWM controller which incorporates an on-chip primary-side control, full protection and other features needed in many offline applications. It supports a variety of control methods, including valley switching control, skip cycle control, and low current burst stop mode control. The UCC2809D-1G4 also provides a wide operating voltage range for the input voltage of 4.5 V to 265 VAC or 120 V to 370 VDC.

UCC2809D-1G4 consists of a voltage detector, an error amplifier, a low power IC regulator,and a gate driver. The voltage detector monitors the output voltage of the power supply and is used to determine the error amplifier output. If the output voltage is too low, the error amplifier’s output increases to reduce the duty cycle of the switcher. The IC regulator is used to limit the Maximum Duty Cycle (MDC) of the switcher. The gate driver is used to drive the high voltage gate supply to the main power MOSFET or IGBT.

UCC2809D-1G4 can be used in various applications such as adapter and charger, battery charger and UPS, IoT connected systems and motor pump controllers. Adapters and chargers use the UCC2809D-1G4 to supply power from the wall outlet to electronic devices. It also supports battery chargers for lithium-ion, lead acid and other battery chemistries. It is also used in industrial applications such as uninterruptible power supplies (UPS) and motor pump controllers. IoT connected systems also rely on the UCC2809D-1G4 to provide low power, ultra reliable operations to wireless applications.

UCC2809D-1G4 relies on an on-chip valley switching control, skip cycle control and low current burst stop mode control method to accurately control current and voltage while the power supply is in operation without the need for an external control loop. The auto-burst operation reduces the system noise and power dissipation when the load is light. The SMPS also includes current mode control for accurate output voltage regulation, programmable frequency for boosting efficiency and a low start-up current for reducing power loss.

In addition to its high-performance power supply capabilities, UCC2809D-1G4 also provides full protection from over-temperature, over-voltage, over-current and short-circuit. Over-temperature protection shuts down the converter when the temperature of the die reaches the maximum operating temperature and restarts the converter after cooling down. Over-voltage protection monitors the incoming voltage and disables the converter if the voltage is too high. Over-current protection shuts down the converter if the current is too high and restarts the converter after the current has dropped to a safe level. Finally, the UCC2809D-1G4 provides short-circuit and soft-start protection.

In conclusion, the UCC2809D-1G4 is a highly integrated PWM controller specifically designed for offline switch mode power supply (SMPS) applications. It is suitable for powering a variety of applications such as adapters and chargers, battery chargers, UPS and IoT connected systems. It relies on an on-chip valley switching control, skip cycle control and low current burst stop mode control to accurately control voltage and current. It also offers full protection from over-temperature, over-voltage, over-current and short-circuit. The UCC2809D-1G4 is clearly an ideal choice for a wide range of power management applications.

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