High-Performance Flyback Controller for Efficient Power Conversion
"(《世界人权宣言》) UCC28704 is a high-efficiency, primary-side regulated (PSR) flyback controller from 德州仪器（TI）, designed to deliver accurate constant-voltage (CV) and constant-current (CC) regulation without the need for an optocoupler. This advanced controller is ideal for low-standby power applications and supports a wide range of AC input voltages, making it a preferred choice for industrial, consumer, and communication power supplies.
Engineered with a proprietary control algorithm, the device enables precise output regulation and high efficiency across varying load conditions. The controller integrates multiple protection features and supports valley-switching for reduced switching losses, making it a reliable and energy-efficient solution for modern power supply designs.
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技术规格和电气特性
The following table outlines the key technical parameters of the UCC28704 flyback controller:
| 参数 | 价值 | 说明 |
|---|---|---|
| 输入电压范围 | 85 V to 265 V AC | Wide input range for global compatibility |
| Start-Up Voltage | 21 V (typical) | Ensures reliable start-up under low input conditions |
| Operating Supply Current | 250 µA (typical) | Ultra-low standby power consumption |
| 开关频率 | Up to 83 kHz | Adaptive frequency control for optimized efficiency |
| Output Regulation | ±1% CV, ±5% CC | High-accuracy voltage and current regulation |
| 保护功能 | OVP, OCP, OTP, UVLO | Comprehensive system protection |
| 包装类型 | SOT-23-6 | Compact footprint for space-constrained designs |
Why Choose This Flyback Controller Over Conventional Alternatives?
Compared to traditional flyback controllers, this device offers several key advantages that make it a superior choice for power supply designers:
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- Primary-Side Regulation (PSR): Eliminates the need for optocouplers and secondary feedback circuits, reducing BOM cost and improving long-term reliability.
- Valley Switching: Minimizes switching losses and electromagnetic interference (EMI), enhancing overall system efficiency.
- Low Standby Power: With a typical operating current of just 250 µA, the controller supports ultra-low standby power designs, meeting global energy efficiency standards such as Energy Star and ErP Lot 6.
- Integrated Protection: Built-in overvoltage, overcurrent, undervoltage lockout, and thermal protection ensure robust operation in harsh environments.
- High Accuracy: Delivers tight output voltage and current regulation, critical for sensitive electronic loads and battery charging applications.
These features make the controller an ideal solution for designers seeking to optimize performance, reduce component count, and meet stringent energy regulations.
工业和消费电子产品中的典型应用
This controller is widely used in a variety of power supply applications across multiple industries. Typical use cases include:
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- AC-DC adapters for smartphones, tablets, and laptops
- Standby power supplies in televisions and set-top boxes
- Industrial control systems and automation equipment
- Battery chargers for power tools and consumer electronics
- LED lighting drivers and smart lighting systems
Its compact form factor and high efficiency make it especially suitable for space-constrained designs and thermally sensitive environments.
德州仪器：电源管理领域值得信赖的品牌
德州仪器（TI） is a globally recognized leader in analog and embedded processing technologies. With decades of innovation in power management ICs, TI delivers reliable, high-performance solutions that meet the evolving needs of industrial, automotive, and consumer markets. The UCC28704 is a testament to TI’s commitment to energy efficiency, system protection, and design simplicity.
Engineers and product developers worldwide trust TI for its robust documentation, long product life cycles, and comprehensive design support. The UCC28704 is backed by TI’s extensive application notes, reference designs, and simulation tools, ensuring a smooth design-in process and faster time to market.
常见问题（FAQ）
1. What is the main benefit of using a primary-side regulated controller?
Primary-side regulation eliminates the need for optocouplers and secondary feedback circuits, reducing component count, improving reliability, and lowering overall system cost while maintaining accurate output regulation.
2. Can this controller be used in universal input power supplies?
Yes, it supports a wide input voltage range from 85 V to 265 V AC, making it suitable for universal input applications across global markets without requiring additional circuitry.
3. How does valley switching improve efficiency?
Valley switching reduces switching losses by turning on the MOSFET when the drain voltage is at its minimum, which also helps lower EMI and improves overall power conversion efficiency.
4. What protection features are integrated into the controller?
The device includes overvoltage protection (OVP), overcurrent protection (OCP), undervoltage lockout (UVLO), and thermal shutdown (OTP), ensuring safe and reliable operation under fault conditions.
5. Is this controller suitable for low standby power applications?
Yes, with a typical operating current of just 250 µA, it supports ultra-low standby power designs, helping manufacturers meet stringent energy efficiency standards like Energy Star and ErP Lot 6.
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