UC2852 - 高功率因数前置稳压器

UC2852是TI德州仪器公司的一款功率因数校正产品，UC2852是高功率因数前置稳压器，本站介绍了UC2852的封装应用图解、特点和优点、功能等，并给出了与UC2852相关的TI元器件型号供参考。

UC2852 - 高功率因数前置稳压器 - 功率因数校正 - 离线隔离型DC/DC控制器和转换器 - 德州仪器

产品描述

The UC1852 provides a low-cost solution to active power-factor correction (PFC) for systems that would otherwise draw high peak current pulses from AC power lines. This circuit implements zero-current switched boost conversion, producing sinusoidal input currents with a minimum of external components, while keeping peak current substantially below that of fully-discontinuous converters.

The UC1852 provides controlled switch on-time to regulate the output bulk DC voltage, an off-time defined by the boost inductor, and a zero-current sensing circuit to reactivate the switch cycle. Even though switching frequency varies with both load and instantaneous line voltage, it can be maintained within a reasonable range to minimize noise generation.

While allowing higher peak switch currents than continuous PFCs such as the UC1854, this device offers less external circuitry and smaller inductors, yet better performance and easier line-noise filtering than discontinuous current PFCs with no sacrifice in complexity or cost. The ability to obtain a power factor in excess of 0.99 makes the UC1852 an optimum choice for low-cost applications in the 50 to 500 watt power range. Protection features of these devices include under-voltage lockout, output clamping, peak-current limiting, and maximum-frequency clamping.

The UC1852 family is available in 8-pin plastic and ceramic dual in-line packages, and in the 8-pin small outline IC package (SOIC). The UC1852 is specified for operation from -55°C to +125°C, the UC2852 is specified for operation from -40°C to +85°C, and the UC3852 is specified for operation from 0°C to +70°C.

产品特性

Low-Cost Power Factor Correction
Power Factor Greater Than 0.99
Few External Parts Required
Controlled On-Time Boost PWM
Zero-Current Switching
Limited Peak Current
Min and Max Frequency Limits
Starting Current Less Than 1mA
High-Current FET Drive Output
Under-Voltage Lockout

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