UCC3804PWG4

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The UCC3804PWG4 is a highly integrated AC/DC offline flyback converter for low power applications. It combines a high voltage DC-DC controller IC, protection circuitry, and a suite of safety and isolation components in a single IC package. A comprehensive current-mode control loop ensures excellent line and load regulation performance. Low standby power and extremely low off-line no-load power consumption (< 0.5W) meet global Energy Star requirements.

The UCC3804PWG4 is suitable for a variety of low-power applications, such as TV, printer, lighting, and home appliance. It is particularly well-suited for applications that require fast response, high efficiency, and high power factor correction without the need for large external components. It also have a range of advanced safety and protection functions including safety (LPSBY, LPER, SSRP), overload (CLASS), temperature protection (TSD), and short circuit (LSCP).

The block diagram of the UCC3804PWG4 shows the main components and their interactions. It contains an input voltage rectifier, an on-chip protection circuit, and a flyback converter including an off-time controller and a current-mode loop controller. The off-time controller maintains a constant off-time of the switching transistor over a wide input voltage and load current range. The current-mode loop controllers provide tighter control of the output voltage, provide enhanced load transient response, and provide PFC operation. The output voltage is monitored by an internal error amplifier and compared to an external reference voltage. The on-chip protection circuit prevents the IC from being damaged due to excessive junction temperatures, input overvoltages, output overloads and short circuits.

The main features of the UCC3804PWG4 include wide 5V to 700V input voltage range, wide load current range from very low 10mA to several Amps, adjustable output voltage, wide frequency range up to 1MHz, and overload protection, short-circuit protection, over-temperature protection and ESD protection. In addition, it has low power consumption, high power factor, and supports peak efficiencies up to 94%.

The UCC3804PWG4 provides a highly integrated solution for AC/DC offline flyback converters, enabling designers to easily and quickly implement systems in a simple, cost-effective manner. The UCC3804PWG4 is an excellent choice for low-power applications that need fast response, high efficiency and high power factor correction.

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