UCC2808ADTR-2G4

Frequency - Switching:	194kHz
Base Part Number:	UCC2808A-2
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	49%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.1 V ~ 15 V
Output Phases:	1
Number of Outputs:	2
Topology:	Push-Pull
Output Configuration:	Positive
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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<h3>UCC2808ADTR-2G4</h3><p>The UCC2808ADTR-2G4 is a digital current-mode controller, designed for low-power, dc-to-dc and ac-to-dc switch mode power supplies. Its high switching frequency, programmable oscillator, and selectable hysterisis or peak current control mode make it an ideal choice for a variety of applications. </p><h4>Application Field</h4><p>The UCC2808ADTR-2G4 is suitable for applications ranging from simple boost, buck, or flyback controllers to advanced active power factor correction (PFC) systems. The device is also suitable for multi-phase designs. Possibilities include DC-DC converters, UPS systems, and server power supplies, among other applications. </p><h4>Working Principle</h4><p>The UCC2808ADTR-2G4 is a digitally-controlled power supply, which uses current-mode control and related technologies to accurately regulate the output voltage or current. In its most basic form, the UCC2808ADTR-2G4 will regulate the output voltage and/or current in response to a feedback voltage, and shut down the power supply output when an over voltage, over current, or short circuit condition is detected. Under short circuit conditions, the UCC2808ADTR-2G4 will shut down the output to protect the load and itself. During normal operation, the UCC2808ADTR-2G4 will provide internal soft-start, foldback current limit and cycle-by-cycle current limit, depending on the application. The device\'s MOSFET gate driver can be configured for either voltage or current mode operation and is capable of driving up to 250mA of gate current. </p><h4>Setup</h4><p>The UCC2808ADTR-2G4 offers a variety of setup and control options to configure its behavior in a given application. To set the frequency of the switching cycles, a resistor connected between the ISO and FB pins is used. Additionally, the soft-start and other timing options can be selected by various combinations of resistors and capacitors. For overload protection, the overload limit voltage can be set with a single resistor connected to the CS pin. </p><h4>Features</h4><p>The UCC2808ADTR-2G4 offers several features to support its wide range of applications. One such feature is the green current limit feature. This feature will reduce the output current before the current is too high and damage the load or device itself. Onboard UVLO (Under Voltage Lockout) circuitry is also included, which will cause the device to shut down in the event of an under voltage fault on the input. The device also features cycle-by-cycle current limiting, which will cause the device to shut off outputs to protect them from overload conditions. Additionally, the UCC4808ADTR-2G4 includes onboard thermal shutdown protection which will protect the device from overheating.</p><h4>Conclusion</h4> <p>The UCC2808ADTR-2G4 is an advanced digital current-mode controller, suitable for a variety of dc-to-dc converters and other switch mode power supplies. Its high switching frequency, programmable oscillator, and selectable hysterisis or peak current control make it suitable for a wide range of applications. Additionally, the device offers advanced features including green current limit, UVLO, thermal protection, and cycle-by-cycle current limit. The UCC2808ADTR-2G4 is a great choice for designers looking for a reliable, easily-configurable, and versatile digital current-mode controller. </p>

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