UCC3808APWTR-1G4

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PMIC or Power Management Integrated Circuit is a device responsible for controlling a system’s power levels and voltage. AC/DC converters, offline switchers and regulators are the main categories of PMICs. The UCC3808APWTR-1G4 is an offline switcher, used to generate the well-regulated voltage needed to power AC/DC adapters, motor drives and inductive loads. The UCC3808APWTR-1G4 uses a synchronous full-bridge converter to rapidly switch high currents with low losses. Its synchronous rectification allows higher efficiency and lower switching losses compared to diode rectification. Its low-noise signal chain eliminates current sensing and its switches are capable of operating at higher frequencies and voltages. The UCC3808APWTR-1G4 includes a start-up circuit and a PWM control circuit for its full-bridge converter. It has a regulation tolerance of ±2.5% over a wide range of input voltage (85-265Vac) and output current. The UCC3808APWTR-1G4 is suitable for use in applications such as AC/DC adapters, battery chargers, motor drives, as well as power supplies for instrumentation, lighting and other equipment requiring high efficiency and EMC performance. The UCC3808APWTR-1G4 operates by way of a voltage loop control system, which is used to regulate the output voltage of the device. It has a programmable under-voltage lockout (UVLO) and providing fast current limiting. When the downstream load is connected to the output terminal, the voltage loop control system measures the output voltage and detected current.The feedback signal is then compared to the target reference voltage, where an error is then generated. This error signal will then be used to adjust the output voltage, providing an regulated voltage output.The PWM control circuit is an oscillator with a frequency range of 8kHz to 500kHz. This oscillator generates a PWM signal when the error signal is within the defined bandwidth. This PWM signal is then outputted to the gate drivers of the full-bridge converter. The duty cycle of this PWM signal are proportional to the error signal, which in turn is used to regulate the output voltage.In conclusion, the UCC3808APWTR-1G4 is an offline switcher that is manufactured to provide efficient and reliable power conversion. Its synchronous full-bridge converter can quickly switch high currents with low losses and its low-noise signal chain eliminates current sensing. This makes it very suitable for AC/DC adapters, motor drives and other inductive loads. Most notably, its voltage loop control system allows for a highly accurate output voltage and provides fast current limiting. With these functionalities, it is no wonder why this device is popularly used in a variety of applications.

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