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PMIC - AC DC Converters, Offline Switchers

UCC2802DG4 is an integrated circuit that belongs to the PMIC family that is known for its conversion of AC inputs to DC outputs. It provides an offline switch dedicated to controlling the power supply. It operates with an operating voltage range of ±8V to ±45V and power rating of 75W, so it is suitable for applications that require high efficiency and low power dissipation.

Features of UCC2802DG4

• Highly efficient switch mode power supply circuit
• Control voltage: ±8V to ±45V
• Power rating: 75W
• Toggle frequency up to 1MHz
• Power on reset
• Under voltage lockout control
• Operating temperature: -40°C to 125°C

Applications of UCC2802DG4

UCC2802DG4 is widely used in a wide range of applications such as LED lighting, DCDC converters, offline power adapters, power management, AC/DC converters, and medical healthcare. It provides higher efficiency, low power dissipation, and a wide input voltage range. It is well suited for applications that require highly efficient and reliable power conversion.

Working Principle of UCC2802DG4

UCC2802DG4 is a non-isolated buck-boost switching regulator that utilizes pulse-width modulation (PWM) control to convert AC input voltage to the required output voltage. The main components used in UCC2802DG4 include an inductor, output filter capacitor, a MOSFET switch, an output rectifier, and an internal control IC. The internal IC is used for the feedback loop error control, switching frequency, and power on and off reset function.

First, the internal IC outputs the switching signal to the MOSFET switch. This switching signal is used to control the power on/off and the duty cycle of the MOSFET switch. The switching voltage is amplified and rectified into a constant DC voltage by the output filter capacitor and rectifier, then the output is provided to the load. The internal IC monitors the output and provides feedback to the MOSFET to control the duty cycle. The frequency of the switching signal generated by IC is adjustable up to 1MHz.

Conclusion

The UCC2802DG4 is an integrated circuit that is used for converting AC power into DC power. It provides an efficient, low power dissipation, and wide input voltage range. It is widely used in LED lighting, DCDC converters, offline power adapters, power management, AC/DC converters, and medical healthcare. Its internal IC controls the duty cycle of the switch, feedback loop error control and the switching frequency.

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