UCC2802N

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The UCC2802N, manufactured by Texas Instruments, is a high speed, duty cycle control circuit designed to provide an inexpensive, low parts-count solution for off-line, switch mode power supplies. It is a Power Management Integrated Circuit (PMIC) designed for AC/DC converters and offline switchers. It provides unitless, peak current mode control through an external resistor, and allows for the control of output peak current. The IC can control and protect various appliances and electronic devices such as TVs, monitors, and printers.

The UCC2802N is typically used in off-line, switch mode power supplies where input is always present and the output is off during active power supply control. It is also used in multiple output, switch mode power supplies as well as AC-DC/DC-DC converters. Furthermore, it can accept numerous input sources such as batteries, wall Mains, or universal supplies with wide voltage swings.

In addition, the output can be in either open loop or closed loop mode. When used in closed loop mode, the UCC2802N is used to regulate output voltage or current. In open loop mode, the device senses output voltage or current. The IC provides a feedback input for each mode as well as outputs for one to five voltage rails. The UCC2802N also provides various protection and control functions such as cycle by cycle peak current limiting, over-temperature protection, power up sequencing, multiple fault detection, and active pre-bias startup.

The UCC2802N is a pulse-width modulation (PWM) controller that uses peak current mode control to regulate the output voltage or current. The circuit monitors the load current and controls the switching frequency and duty cycle to achieve the desired output voltage or current. The output of the circuit is also short-circuit protected.

The UCC2802N features an adjustable frequency control function. All the internal PWM values can be modified by an external resistor. This allows the user to digitally adjust the switching frequency, dead time, and compensation by setting the appropriate resistor values. The IC also provides two analog timer comparators for some external events as well.

The UCC2802N is available in eight different packages and comes in 8 to 40 pin configurations. It is designed for a switching frequency range of 25 kHz to 400kHz and is offered in wide temperature range (-40°C to +125°C). The device can also support a maximum power output of 10 watts.

The UCC2802N is a cost-effective and efficient solution for application in off-line, switch mode power supplies, AC/DC converters, and DC/DC converters as well. It provides a unitless peak current mode control, adjustable frequency control, over-temperature protection, power up sequencing, and multiple fault detection. Furthermore, it is available in a variety of packages and offers high temperature operation and short-circuit protection.

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