UCC2802NG4

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The UCC2802NG4 is a high performance and fully programmable, single-channel power supply control and protection integrated circuit optimized for low-cost off-line switched mode power supplies (SMPS). It is suitable for low power AC-DC and DC-DC converter applications such as PC power supplies, mobile adapters, and compact electronic ballasts. This IC from Texas Instruments features programmable shutdown and undervoltage lockout, primary-side current sensing, and an adjustable transconductance error amplifier for maximum flexibility and cost-efficiency.

Features of UCC2802NG4

• Low operating current
• Compatible with Resistive, Capacitive and MOSFET feedback control
• Flexible undervoltage lockout
• Adjustable shutdown threshold and output voltage
• Programmable soft-start
• Power device thermal shutdown circuit
• No auxillary bias winding or zener diode necessary
• Sufficiently optimized startup characteristics for diode emulation or hysteretic start
• Continuous conduction mode operation
• Includes CMOS logic level compatible logic input and active low output

Application Field of UCC2802NG4

The UCC2802NG4 is designed for applications with low to medium power range (up to 15W). The optimized feedback control used in this IC makes it suitable for a wide range of commonly used AC-DC converters. It is suitable for cost-sensitive applications such as PC power supplies and mobile adapters, as well as for lighting applications such as electronic ballasts. Additionally, it is also suitable for small DC-DC converters.

Working Principle of UCC2802NG4

The UCC2802NG4 operates in continuous conduction mode by combining a resistive, capacitive, or MOSFET feedback control with an adjustable transconductance error amplifier. The adjustable transconductance error amplifier has a wide range of operating input voltages and feedback control sensitivity, enabling optimization of the power stage. With the adjustable transconductance error amplifier, the duty cycle of the primary switch is varied to adjust the output voltage.

The UCC2802NG4 can be easily adapted to a variety of load types by selecting the appropriate feedback control. The feedback control is optimized for a resistive load and works well with lightly loaded inductive, capacitive and MOSFET loads. For more heavily loaded inductive and capacitive loads, the feedback control can be adjusted using the resistive, capacitive, and MOSFET control pins.

The UCC2802NG4 provides both a logic input to enable/disable the device, as well as an active low output to indicate when the device is enabled. An adjustable undervoltage lockout, adjustable shutdown threshold, and programmable soft-start ensure reliable startup and operation. Additionally, the UCC2802NG4 includes a power device thermal shutdown circuit to protect the power devices and the power stage from overtemperature conditions.

Conclusion

The UCC2802NG4 from Texas Instruments is a cost-effective and reliable control IC designed for AC-DC and DC-DC switch mode power supplies with output powers up to 15W. This IC integrates a wide range of features such as adjustable undervoltage lockout, adjustable shutdown threshold, and programmable soft-start. Additionally, the adjustable transconductance error amplifier allows the use of a wide range of feedback control types, making the UCC2802NG4 suitable for a wide range of applications.

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