UCC28085DR Integrated Circuits (ICs)

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The UCC28085DR is a member of Texas Instruments\' UCC2808x family of controllers. It is an integrated circuit that provides the control and protection functions necessary to implement an AC or DC to DC converter. The UCC28085DR is designed for use in offline switcher topologies, including isolated flyback converters, push-pull converters, forward converters and resonance converters.

The UCC28085DR can be used in applications ranging from 25 watts to 300 watts, from 48 volts down to 12 volts of input voltage, with outputs from 2.5 volts to 48 volts. It provides integrated features such as input overvoltage, output overvoltage, overcurrent, temperature cutback and undervoltage lockout. The UCC28085DR also includes an active electrically-erasable programmable read-only memory (EEPROM).

In terms of operation, the UCC28085DR is a current mode controller that includes an oscillator, undervoltage lockout, cycle-by-cycle current limit with programmable peak current limit, adjustable slope compensation and an adjustable constant off-time with programmable maximum on-time. The output voltage is sensed by an opto-coupler with an open-loop voltage gain of 1. The UCC28085DR provides the flexibility of an open loop topology that supports various transformer isolation schemes.

The UCC28085DR also offers advantages such as hysteretic current mode control for improved line/load transient response, and no current sense resistor required for current limit. Additionally, it features a built-in voltage and current loop compensation network for a variety of different operating modes using both standard and custom components. Finally, the UCC28085DR features a wide operating temperature range up to 110°C.

In conclusion, the UCC28085DR is a highly integrated controller designed for AC and DC to DC applications. It offers excellent performance and protection functions, with a wide range of input and output voltages, integrated EEPROM and a range of other features. With these features, and its ability to operate over a wide temperature range, the UCC28085DR is an ideal choice for offline switcher designs.

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