Product Overview for Texas Instruments UCC28710DR

1. Introduction

The Texas Instruments UCC28710DR is a high-performance flyback power supply controller that serves as an advanced solution for switch-mode power supplies (SMPS). Engineered for energy efficiency and adaptability, this part is essential in applications that require optimized power conversion, including AC-DC adapters, consumer electronics, and appliances. This article provides a comprehensive overview of UCC28710DR, including its features, technical specifications, common applications, decoding part numbers, and frequently asked questions (FAQs) for prospective users.

2. Product Description

The UCC28710DR belongs to Texas Instruments' UCC28710 series of flyback controllers, designed to maximize energy efficiency and minimize standby power loss. This device supports high switching frequencies and operates across a wide input voltage range, making it ideal for universal AC adapters and various low- to mid-power AC-DC converters. One of the defining characteristics of the UCC28710DR is its use of the primary-side regulation (PSR) topology, which enables output voltage regulation without requiring an optocoupler or secondary-side feedback circuit. This not only simplifies the design but also enhances durability and reduces overall system costs.

3. Key Features

The UCC28710DR offers numerous features aimed at achieving high efficiency and stability, including:

• Primary-Side Regulation (PSR): No optocoupler required for output voltage regulation, simplifying design.
• Low Standby Power: Standby power is reduced to below 30 mW, making it highly energy-efficient.
• Frequency Modulation and DCM: Supports frequency modulation with Discontinuous Conduction Mode (DCM) to enhance efficiency across variable loads.
• Integrated 700V Power MOSFET Drive: Reduces the need for external components in high-voltage systems.
• Constant-Voltage (CV) and Constant-Current (CC) Control: Ideal for battery chargers and power adapters where stable output is required.
• Output Over-Voltage and Short Circuit Protection: Ensures the safety and longevity of connected devices.
• Current Sense with Built-In Leading Edge Blanking: Reduces noise interference and enhances signal integrity.

4. Detailed Specifications

5. Applications

The UCC28710DR is suited for a variety of applications where efficiency, cost, and reliability are priorities:

• AC-DC Adapters: Used in universal adapters for various electronic devices due to its broad input voltage range and efficiency.
• Battery Chargers: The CV/CC capabilities are ideal for stable charging solutions.
• Consumer Electronics: Applicable in TVs, set-top boxes, and other devices needing low standby power.
• Industrial Power Supplies: Reliable for powering low-wattage industrial electronics.
• LED Lighting Drivers: Optimized for use in efficient LED driver circuits where high efficiency is crucial.

6. Decoding Part Number: UCC28710DR

Understanding the part number is essential for identifying the specific features and specifications:

• UCC: Indicates the device belongs to Texas Instruments' line of controllers.
• 28710: Model number, identifying the specific series and functionality (i.e., flyback controllers with PSR).
• D: Refers to the package type, which in this case is SOIC (Small Outline Integrated Circuit).
• R: Designates the device’s packaging format, indicating a reel-type format, which is suitable for high-volume production.

7. Manufacturer Overview: Texas Instruments

Texas Instruments (TI) is a renowned leader in the semiconductor industry, recognized for its innovations in analog and embedded processing technology. With a product range encompassing microcontrollers, processors, and power management devices, TI supplies components essential for sectors including automotive, industrial, consumer electronics, and telecommunications. TI’s focus on quality, sustainability, and performance has made it a trusted partner for engineers and manufacturers worldwide.

8. Frequently Asked Questions (FAQ)

Q1: What is primary-side regulation (PSR), and how does it benefit designs?
A1: Primary-side regulation allows output voltage regulation without a secondary-side feedback circuit. This reduces the need for additional components, simplifies design, and improves reliability by eliminating potential failure points, such as optocouplers.

Q2: How does the UCC28710DR achieve low standby power?
A2: The UCC28710DR features adaptive frequency modulation and low switching frequency under light load conditions, which helps it achieve standby power levels below 30 mW.

Q3: What types of protection features are integrated into the UCC28710DR?
A3: The UCC28710DR includes protections against overvoltage, short circuits, overcurrent, and thermal shutdown, safeguarding both the controller and connected components.

Q4: Can the UCC28710DR be used for high-power applications?
A4: No, the UCC28710DR is best suited for low to medium-power applications. It may not be appropriate for high-power applications due to current and power limits.

Q5: What is the input voltage range of the UCC28710DR?
A5: The UCC28710DR supports an AC input voltage range of 85V to 265V, making it suitable for both low and high-line applications.

Q6: How does the UCC28710DR handle varying loads?
A6: The UCC28710DR operates in Discontinuous Conduction Mode (DCM), adjusting the switching frequency based on the load, which maximizes efficiency across different load conditions.

Q7: What package type does the UCC28710DR come in?
A7: The UCC28710DR is available in a 7-pin SOIC (Small Outline Integrated Circuit) package, making it compact and easy to integrate into designs.

Q8: Is the UCC28710DR suitable for battery charging applications?
A8: Yes, the UCC28710DR is suitable for battery chargers due to its CV/CC control, providing stable current and voltage during charging.

Q9: Can the UCC28710DR be used in LED drivers?
A9: Yes, the device is well-suited for LED driver applications where efficiency and compact design are required.

Q10: What operating temperatures does the UCC28710DR support?
A10: The UCC28710DR is designed to operate across a wide temperature range, allowing it to function in various environmental conditions.

9. Additional Information

The UCC28710DR’s primary-side regulation and adaptive control techniques make it a versatile component that meets stringent energy efficiency standards, such as those set by ENERGY STAR and EU EcoDesign. Furthermore, its high-frequency switching capabilities reduce magnetic component sizes, resulting in a more compact overall design, which is critical for portable and consumer electronics.

10. Conclusion

The Texas Instruments UCC28710DR is a high-efficiency, cost-effective flyback power supply controller, well-suited for low- to medium-power applications. With its primary-side regulation, low standby power, and robust protection features, it’s an ideal choice for engineers seeking a streamlined solution for AC-DC power supplies. The UCC28710DR combines energy efficiency with ease of use, contributing to more sustainable, reliable power solutions across consumer electronics, industrial equipment, and LED lighting. Texas Instruments' reputation for quality further reinforces the UCC28710DR as a top choice in this category.

This power controller offers a balanced solution that meets the demands of today’s power-sensitive applications, making it invaluable in markets prioritizing both performance and environmental impact.

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