UCC25706DGK

Duty Cycle:	93%
Base Part Number:	UCC25706
Mounting Type:	Surface Mount
Supplier Device Package:	8-VSSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Operating Temperature:	-55°C ~ 150°C (TJ)
Control Features:	--
Fault Protection:	Current Limiting
Frequency - Switching:	1MHz
Series:	--
Voltage - Supply (Vcc/Vdd):	8 V ~ 15 V
Voltage - Start Up:	12V
Topology:	Boost, Flyback, Forward
Voltage - Breakdown:	--
Internal Switch(s):	No
Output Isolation:	Isolated
Part Status:	Active
Packaging:	Tube

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PMIC - AC DC Converters, Offline Switchers

The UCC25706DGK is an integrated, wide VIN range, 26V Hard Switched Flyback Controller for offline AC/DC power supplies. This component provides design engineers with all the features necessary to design low cost, high performance consumer and industrial applications. The UCC25706DGK is designed to drive N-channel MOSFETs in either diode emulation mode or Critical Conduction Mode (CRM). Applications of the UCC25706DGK include AC/DC converters for any type of consumer or industrial product where cost and size are the main criteria. This component can be used in designs where harsh conditions and extended operation, such as those found in automotive, office and industrial applications, are required.

Working Principle of the UCC25706DGK

The UCC25706DGK features an innovative adaptive control scheme that offers a highly efficient and cost-effective solution for low power, low drop-out AC/DC designs. This scheme uses a large window comparator with synchronous output to regulate the switching period, and an input voltage controlled oscillator (VCO) to adjust period for continuous regulation. The installation of two integrated programmable protections on the UCC25706DGK reduces the need for external components, which significantly reduces the overall design time. These include cycle-by-cycle current limit and fast over-voltage protection. The cycle-by-cycle current limit ensures that inductor peak current is limited by a user-defined current limit. This control also reduces audible noises and prevents secondary components from damaging due to over-current. The fast over-voltage protection provides a fast shutdown during an output voltage overshoot, hence protecting the output components from any potential damage.The UCC25706DGK reduces the size of the power supply design by making use of several innovative advanced features in the IC. It includes an integrated low power, low drop-out linear regulator, which can be used to provide bias current to drive the gate of the external MOSFET. The regulator has a low output current capability and a wide output voltage range between 0.8V and 40V. The UCC25706DGK also integrates both the error amplifier and the oscillator overvoltage detector, reducing the design time significantly. In addition, the UCC25706DGK integrates all the current sensing and control logic. Its internal gain is adjustable, and the output voltage can be programmed through the integrated digital control interface. With the available adjustable digital configuration bits, the UCC25706DGK is can be configured for different output applications in multiple logic families.

Conclusion

The UCC25706DGK is a highly integrated, wide VIN range, 26V Hard Switched Flyback controller for offline AC/DC power supplies. With its innovative adaptive control scheme and added protection features, the UCC25706DGK is an ideal solution for low cost, high performance consumer and industrial applications. Its integrated features reduce design time, and its wide output voltage range make it suitable for a variety of different applications.

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