UCC2806DTR

Frequency - Switching:	47kHz
Base Part Number:	UCC2806
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, Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	50%
Series:	--
Voltage - Supply (Vcc/Vdd):	8 V ~ 14.5 V
Output Phases:	1
Number of Outputs:	2
Topology:	Boost, Flyback, Forward Converter
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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UCC2806DTR Application Field and Working Principle

The UCC2806DTR is a high-performance current-mode PWM controller that is typically used in primary-side control and secondary-side feedback equipment. It is specifically designed to work with single-ended input/output transformer isolated DC-DC converter topologies such as the buck, boost and flyback. This device can operated with a wide input supply range of 2.65V to 10V, making it ideal for battery-powered applications. It contains features such as constant frequency/skip cycle operation, separate fault and soft-start logic, an internal pull-down Current Sense Amplifier (CSA) and an over-current shutdown timer.

Application Field

The UCC2806DTR is in the class of power management integrated circuit (PMIC) voltage regulators, specifically in the sub-class of DC-DC switching controllers. The device is typically used in laptop adapters, notebooks, battery chargers, non-isolating buck/boost converters, and many other communication networks. It also works with many other power management applications, such as battery-powered adapters, automobiles, medical devices and more.

Working Principle

The UCC2806DTR uses a current-mode PWM control method to regulate voltage by monitoring and controlling the current that flows through an inductor. It operates using an on-duration pulse width modulation (PWM) method in which a Pulse Frequency Modulator (PFM) circuit is used to determine when the FET switch is on. When on, the current starts to charge the inductor up, and when off, the energy in the inductor is released. The current then begins to be pulled through the load and diode, with the voltage across the load increasing. The UCC2806DTR monitors the current in the inductor, the load current, and the voltage. When the inductor current exceeds a certain limit, the power switch is then shut off, which protects the load and prevents any damage to the circuit. It also monitors the input and output voltages, and when it detects one of them is too low or too high, it shuts off the power switch as well. This feature is especially helpful to protect the load against power surges or short-circuiting.The controller includes an internal pull-down current sense amplifier (CSA) which allows for accurate output voltage sensing for either current or voltage mode control. The controller also has fault and soft start logic, which allows the user to safely and accurately control the start and stop of the power switch. The UCC2806DTR is designed to operate at a constant frequency, but is also capable of skip switching at a predetermined frequency, allowing it to be tailored exactly to the needs of the specific application. Overall, the UCC2806DTR is a high performance current-mode PWM controller that is designed for use in primary-side control and secondary-side feedback equipment. It is extremely versatile and can be used in a wide variety of power management applications. The device includes many features that make it extremely reliable and efficient, and it is the perfect choice for DC-DC switching controller applications.

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