UCC2806DG4

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:	Tube

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UCC2806DG4 Application Field and Working Principle

The UCC2806DG4, which belongs to the series of PMIC (Power Management IC) solutions from Texas Instruments, is a simultaneous-mode, secondary side synchronous rectification, DC/DC switching controllers. It is designed for applications such as distributed power systems, server power supplies and telecom power supplies.This device provides a variety of benefits to its users, thanks to its efficient, simultaneous-mode output control with pulse-skip capability and adjustable deadtime compensation for zero crossing. It also supports high speed cycle-by-cycle peak current limit protection and accurate hysteretic thermal shutdown with graceful degradation.This product has flexible input and output voltage range, providing adjustable/fixed output voltage option along with ±2V sensing voltage range to implement an output voltage level. With an integrated compensation network, UCC2806DG4 has less external components and thus reduces the overall design complexity. It is rated to operate between 4.75V to 16V input voltage range, and 0V to 6V output voltage range.

Working Principle

The UCC2806DG4 implements a synchronous rectification technique to increase the efficiency of the converter, supporting a variety of topologies such as buck, boost, buck-boost and SEPIC. It features a set of regulators and gates to form a synchronous controller, with a pre-driver to drive a high side/low side power MOSFET.UCC2806DG4 contains two differential inputs (VIN_COMP and VOUT_FB) to sense the output voltage and control the oscillator, respectively. The input voltage (VIN) is supplied to the GATE drive at each oscillator\'s rising edge and the GATE drive is turned off at each falling edge. This results in a reduction of the power dissipated at low output voltage levels thus increasing the efficiency of the converter.To improve the accuracy of the output voltage, UCC2806DG4 has a compensation network. This network contains adjustable compensation components such as timings (deadtime) components and current control elements which affect the output voltage ripple, duty cycle and peak current. Apart from these, the device also includes a single two-phase frequency-lock feature which is used to reduce audible noise.

Conclusion

The UCC2806DG4 from Texas Instruments is a versatile DC/DC switching controller featuring synchronous rectification, adjustable/fixed output voltage option, adjustable deadtime compensation, high speed cycle-by-cycle peak current limit protection, and accurate hysteretic thermal shutdown with graceful degradation. With its efficient and feature packed design, UCC2806DG4 is an ideal choice for distributed power systems, server power supplies, and telecom power supplies.

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