UCC2891DR

Frequency - Switching:	250kHz
Base Part Number:	UCC2891
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, On Time Control, Ramp, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	70%
Series:	--
Voltage - Supply (Vcc/Vdd):	8.5 V ~ 16 V
Output Phases:	1
Number of Outputs:	1
Topology:	Flyback, Forward Converter
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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UCC2891DR is a new integrated controller developed by Texas Instruments. It enables system designers to have a more efficient, simplified and cost-effective ACDC or DCDC power supply solution. It has superior performance, effective isolation and high system efficiency due to its flexibility. The UCC2891DR can be used in a variety of applications such as ACDC or DCDC power conversion, PFC, and other motor control systems.The UCC2891DR provides cost-effective ACDC and DCDC power conversion, with features such as digital control, integrated line voltage feedback, wide input voltage range, programmable response time, and low output ripple. The controller has additional benefits such as low mains voltage starting power, savings in external components like optocouplers, magnetic components and shielding, and simple calibration.The UCC2891DR can be used for a wide range of ACDC and DCDC power supplies. It can be used for applications such as chargers, converters, PFCs, motor drives, active clamping and other applications. The controller can be configured with various topologies, such as flyback, forward, push-pull and other popular topologies. It also has a wide input voltage range from 85Vac to 550Vac, with system adjustable through either resistor divider or digital potentiometer.The UCC2891DR has advanced features to provide superior performance. It has integrated line voltage tracking, programmable response time, active clamp disabling, dual voltage sensing, and remote sensing. The controller also features frequency adjustment and dead-time control through external components. The integrated features of the controller provide superior power conversion and superior system reliability, allowing customers to simplify designs and reduce overall costs.The UCC2891DR works on the principle of peak current mode control. This method of controlling power conversion helps to reduce electromagnetic interference, increase efficiency and reliable operation. The controller uses a sense resistor at the output of the power stage, which allows for direct current sensing of the peak current, resulting in improved transient response and excellent regulation of the output voltage/current. This peak current mode control gives the controller an advantage over other controllers, as it can process rapid changes in load and provides superior system protection.In conclusion, the UCC2891DR from Texas Instruments is an advanced integrated switching controller, designed for ACDC or DCDC power conversion. It provides wide input voltage range, programmable response time, high system efficiency, and integrates line voltage feedback. The controller works on the principle of peak current mode control, resulting in excellent transient response and superior system reliability. The UCC2891DR is a cost-effective solution and is ideal for applications such as ACDC or DCDC power conversion, PFC and motor control systems.

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