UCC2809P-1G4

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The UCC2809P-1G4 is a current-mode pulse-width modulator (PWM) power factor correction (PFC) controller. This controller uses an advanced current-mode control technique that features a fast transient response and excellent line voltage feed forward behavior.
The UCC2809P-1G4 is used as an offline switcher in AC and DC power conversion, including power factor correction, high and low power factor operations, output power control, and active rectification for boost, buck, and buck-boost applications. With a wide input voltage range and a low standby power consumption, it is ideal for applications such as LED lighting, PC power supply, motor control, white goods and adapter design.
Working Principles of the UCC2809P-1G4
The UCC2809P-1G4 is a pulse-width modulation (PWM) controller that combines current-mode control with a wide input voltage range and low standby power consumption. It uses a current-mode control technique which provides fast transient response and excellent line voltage feed forward behavior. The device includes an internal clamping loop which allows the input voltage to be increased well beyond the normal switch on voltage. This feature makes the UCC2809P-1G4 an ideal choice for applications such as LED lighting, PC power supply, motor control, and adapter design.
The UCC2809P-1G4 implements several protection features including under-voltage lockout (UVLO) and over-voltage protection (OVP) for over-voltage of the input voltage and output voltage. In addition to providing overcurrent protection (OCP), it also provides analog dimming of the output current by changing the OCP reference voltage. This also allows for improved efficiency during light-load conditions.
The UCC2809P-1G4 includes an overload detection circuit which compares the on-time of the output current waveform with the input voltage waveform. Whenever the output current waveform exceeds the input voltage waveform, the overload detection circuit detects the condition and triggers a fault signal. This fault signal can be used to protect the switch or to reduce the output power in case of an over-temperature condition.
In summary, the UCC2809P-1G4 is a current-mode pulse-width modulator (PWM) power factor correction (PFC) controller. It is used as an offline switcher in AC and DC power conversion and includes protection features such as under-voltage lockout (UVLO), over-voltage protection (OVP) and overload detection circuit. With a wide input voltage range and low standby power consumption, it is ideal for applications such as LED lighting, PC power supplies, motor control and adapter design.

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