UCC2804PWTRG4

Duty Cycle:	49%
Base Part Number:	UCC2804
Mounting Type:	Surface Mount
Supplier Device Package:	8-TSSOP
Package / Case:	8-TSSOP (0.173", 4.40mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Frequency Control
Fault Protection:	Current Limiting
Frequency - Switching:	Up to 1MHz
Series:	--
Voltage - Supply (Vcc/Vdd):	8.3 V ~ 12 V
Voltage - Start Up:	12.5V
Topology:	Boost, Flyback, Forward
Voltage - Breakdown:	--
Internal Switch(s):	No
Output Isolation:	--
Part Status:	Active
Packaging:	Tape & Reel (TR)

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UCC2804PWTRG4 application field and working mechanism

UCC2804PWTRG4, designed and developed by Texas Instruments, is a 8-pin remotely shutdown off-line switcher. It is part of a family of integrated circuits which notably belong to the Power Management IC (PMIC) AC/DC converters and Offline/non-isolated switchers.

Overview

UCC2804PWTRG4 is a SMPS controller IC that provides accurate primary side-control for high-performance, low cost, flyback topology converters. This versatile device can be used in either a synchronous or asynchronous topology. The device is designed to provide high efficiency, using features such as pulse frequency modulation (PFM), primary side regulation, and synchronous rectification. It also works with up to 85V AC line input.The UCC2804 includes a voltage-mode control loop, with a high-voltage start-up regulator, to accurately control the output voltage during line and load changes with excellent line and load regulation. It also provides for current mode control for soft-start and short-circuit protection. Lastly, it provides for open or shorted optocoupler photo-IC protection for both normal and fault conditions in continuous or burst modes.

Application Fields

The UCC2804PWTRG4 finds its ideal zone of application in indoor applications such as wall chargers, small switching power supplies and any other Switch Mode Power Supplies with power needs between 5W and 70W at 5V to 12V outputs.

Working Mechanism

UCC2804PWTRG4 works primarily by using pulse frequency modulation (PFM) technique to achieve high performance conversion efficiency. Additionally, voltage-mode control loop and open/short optocoupler photo-IC protection are frequently employed in order to control the output voltage during line and load changes, as well as provide for current mode control for soft-start and short-circuit protection features. The control algorithm of UCC2804PWTRG4 implements a non-synchronous rectification and allows for the usage of low cost FETs. In the monostable mode operation, the IC provides a shutdown mode where the driver stage is turned off. The operation is protected from over-current and open loop states respective feedback connections. For the operation mode, the IC operates in a slopes compensation regime providing linear voltage regulation. The current mode control loop allows for the usage of fewer components, simplifying the design and improving the system EMI.

Conclusion

UCC2804PWTRG4 is a high performance off-line switcher which finds usage in PMIC AC/DC converter and Offline/non-isolated switcher solutions. It provides excellent efficiency flyback topologies with pulse frequency modulation (PFM), primary side regulation, and synchronous rectification. With advanced features including over-current and open loop, voltage-mode and current mode control, it is the perfect choice of power supply IC for a host of applications.

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