UCC3813PWTR-0G4

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The UCC3813PWTR-0G4 is an adjustable-frequency base drive pulse-width modulation (PWM) controller built with a CMOS process, specifically optimized for high power off-line switchmode supplies that are used in consumer and industrial electronics. This integrated circuit offers a high level of integration and low cost, making it an attractive choice for low-cost, high-efficiency discrete PWM designs.

Application Field

The UCC3813PWTR-0G4 can be used in a variety of applications where a low-cost, high-efficiency power supply design is needed. These include consumer electronic products such as TVs, VCRs, stereos, and printers, as well as medical and industrial equipment. The controller is specifically designed to meet the demanding requirements of a variety of applications and can be used in a number of different topologies, including flyback, forward, bridge and push-pull.

The UCC3813PWTR-0G4 has a wide input voltage range of 50V to 600V, allowing it to be used in a wide variety of applications. It also features an adjustable frequency operation, low operating current, and a low jitter PWM waveform. This makes it suitable for use in low-cost discrete designs, as well as high-power, high-efficiency applications.

Working Principle

The UCC3813PWTR-0G4 operates by comparing the current error to a fixed level. This error is compared to the output of two separate voltage feedback paths, which determine the reference voltage for the device. When the feedback paths exceed the preset level, the output of the UCC3813PWTR-0G4 is turned on, and subsequently reduced as the output current drops. During this process, the switching frequency is adjusted to maintain a constant average output current.

When the output current reaches the preset level, the output of the UCC3813PWTR-0G4 is turned off. This results in a "valley" in the current waveform, as the device begins to ramp down the output current. Once the output current has been reduced to a level below the setpoint, the UCC3813PWTR-0G4 closes the switch again, and the cycle is repeated.

The UCC3813PWTR-0G4 also features overcurrent protection and undervoltage lockout. This feature prevents the device from operating outside of its specified operating range, protecting the user from potential damage.

Conclusion

The UCC3813PWTR-0G4 is a low-cost, high-efficiency controller designed specifically for high power off-line switchmode supplies. It is suitable for a wide variety of applications, from consumer electronics to medical and industrial equipment. Its integrated features, such as adjustable frequency operation, low jitter PWM waveform, and overcurrent protection, make it a great choice for designers who need a low-cost, high efficiency power supply design.

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