UCC25705PG4

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UCC25705PG4 Application Field and Working Principle

UCC25705PG4 is a PWM-controlled LED driver from Texas Instruments. This controller is particularly suited for driving LED strings up to 15V and up to 75 mA in constant current, constant voltage, and dimming applications. This model is part of the Universal Combination Controllers (UCC) family, and it is a DC-DC Switching Controller that is designed to accurately control switch mode converters over the broadest range of input voltage and output current requirements.

Features of the UCC25705PG4

The UCC25705PG4 controller is designed to implement and drive a variety of modern Switch Mode converter topologies and can easily control a wide range of loads. The advanced control algorithms provide high efficiency, fast transient response, and improved system reliability. The main features of the UCC25705PG4 model include:

• High-Performance PWM Controller for LED Drivers
• High-Frequency and High-Efficiency PWM Output
• Wide Output Voltage Range from 0.7V to 11V
• Wide Output Current Range up to 75mA
• Programmable Constant Voltage and Constant Current Outputs
• Programmable Dimming Function with OVP, OCP, and UVP Protection
• Integrated Low-Dropout linear regulator equipped with reverse current protection

UCC25705PG4 Application Field

The UCC25705PG4 controller is particularly suitable for LED applications, such as LED backlighting, LED strips, LED decorative lighting, LED signs and panels, and LED projection systems. The UCC25705PG4 controller can be used in a wide range of applications, including LED TV, LED monitor, LED laptop, LED projector, LED automotive lighting, and many more.

UCC25705PG4 Working Principle

The UCC25705PG4 DC-DC Switching Controller is designed to enable the efficient operation of various switch mode converters, such as buck, boost, buck-boost, and flyback converters. This controller takes an input voltage from the source and transforms it into an output voltage which can be used for a range of applications. The controller utilizes a PWM signal to accurately control the on-time of the power switch. The power switch is enabled for the duration of the PWM pulses and is disabled when the pulses are inactive. The output voltage is regulated with a feedback loop, which consists of an error amplifier and a voltage divider feeding back to the PWM comparator. This feedback loop continuously monitors and adjusts the output voltage to maintain a desired level.

The UCC25705PG4 also provides several protection abilities, such as Over Voltage Protection, Under Voltage Protection, and Current Protection. This ensures that the converter function properly and safely across a wide range of input voltages and output currents. The integrated low-dropout linear regulator allows for a regulated output voltage even when the input voltage is significantly lower than the output voltage.

Conclusion

The UCC25705PG4 from Texas Instruments is a high-performance PWM controller specifically designed for LED drivers. It is part of the Universal Combination Controllers family, and it is a DC-DC Switching Controller that is designed to accurately control switching converters over a wide range of input voltages and current requirements. This controller is particularly suitable for driving LED strings up to 15V and up to 75 mA in constant current, constant voltage, and dimming applications. This model provides several protection abilities, such as Over Voltage Protection, Under Voltage Protection, and Current Protection.

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