E-UC3842BD1

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The E-UC3842BD1 device is a monolithic, high performance, single-chip controller that is specifically designed to achieve minimum system cost and increased design flexibility when using off-line flyback converters. E-UC3842BD1 integrated all the necessary active functions needed to implement many popular levels of off-line flyback converters. This controller nicely combines a compound control loop with a cycle by-cycle single-cycle over current protection. The parts are fully protected against bursts of load current up to 15 A peak and feature a minimum start-up current of 5 mA.

The E-UC3842BD1 provides an ideal solution for many AC / DC Converters, Offline Switchers, low power applications and high frequency power supplies. It is designed to operate from universal mains (50 / 60 Hz line frequencies) and is available in high performance, commercial, or automotive temperature ranges.

Working Principle of the E-UC3842BD1

The E-UC3842BD1 employs a “compound” control loop which ensures good response for small output voltage changes. To meet world wide power line requirements, the E-UC3842BD1 can be used in the operation of either low line voltage (85Vac) or high line voltage (265Vac). Cycle by cycle single cycle over current protection is provided with a fast latching circuit that allows a very accurate setting over a wide dynamic range. An adjustable soft start is used to prevent the output from inrush current and overshoot; it is also use to prevent an instantaneous output voltage from overloading higher than the power line voltage.

The E-UC3842BD1 has a constant frequency operation for proper EMI filtration. It allows to use smaller magnetics elements and allow operation over a wider range. It also includes a controller latch which prevents a false start-up operation of the PWM cycle if the R-C element is removed. The thermally enhanced packaging improves cooling, resulting in improved dynamic performance.

Applications of the E-UC3842BD1

The E-UC3842BD1 is of particular value in AC to DC Switching Power Supplies. It can also be used in many refrigeration systems and products such as fume hoods, medical equipment, vending machines, computer peripherals, office/household appliances, audio and video equipment, and industrial equipment. this control IC offers sophisticated features in an improved package that minimize external components.

The E-UC3842BD1 is a versatile and feature rich controller that provides enhanced system cost and design flexibility for a wide range of AC to DC power converters. It combines a compound control loop with a cycle by-cycle single-cycle over current protection and other features. The device ensures continuous current and temperature protection, improving system safety and reliability. the IC also has low start-up current and is protected against input spike surges and multi line ground transients.

The controller can operate in open loop or closed loop depending on external components and settings. In open loop it can easily replace a single pulse topologies, while in closed loop configuration, it can replace two pulse forward converters. It is also can be used to replace charge-pump topologies in a single switch asynchronous pre-regulation scheme. It also includes a voltage feedback circuit ideal for PFC (Power Factor Correction) applications. The E-UC3842BD1 is also ideal for applications that require reduced electromagnetic interference (EMI).

Conclusion

The E-UC3842BD1 is a high power, feature rich controller that can easily replace single and two pulse forward converters. It can be used for AC to DC power converters as well as for many refrigeration systems and accessible consumer applications. The controller is highly reliable and provides a number of features that ensure that it can easily meet the requirements of a wide variety of applications. The device is suitable for applications that require low start-up current, EMI, and fast response to input voltage changes.

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