UC2853A - 高功率因数前置稳压器

UC2853A是TI德州仪器公司的一款功率因数校正产品，UC2853A是高功率因数前置稳压器，本站介绍了UC2853A的封装应用图解、特点和优点、功能等，并给出了与UC2853A相关的TI元器件型号供参考。

UC2853A - 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 UC2853A provides simple, yet high performance active power factor correction. Using the same control technique as the UC1854, this 8-pin device exploits a simplified architecture and an internal oscillator to minimize external component count. The UC2853A incorporates a precision multiplier/squarer/divider circuit, voltage and current loop error amplifiers, and a precision voltage reference to implement average current mode control with RMS line voltage compensation. This control technique maintains constant loop gain with changes in input voltage, which minimizes input line current distortion over the worldwide input voltage range.

The internal 63kHz oscillator includes an external clock input, allowing synchronization to downstream converters. Additionally, the device features an overvoltage protection comparator, a clamped MOSFET gate driver which self-biases low during undervoltage lockout, and low startup and supply current.

The UC2853A is identical to the UC2853 except the internal oscillator frequency has been reduced from 75kHz to 63kHz. The switching frequency is lowered in order to keep the second harmonic of the switching frequency below a 150kHz. For EMI specifications at 150kHz this makes it easier for a design to meet system requirements.

These devices are available in 8-pin PDIP (P) and SOIC (D) packages. The UC2853A is specified for operation from –40°C to 105°C.

产品特性

Complete 8-pin Power Factor Solution
Reduced External Components
RMS Line Voltage Compensation
Precision Multiplier/Squarer/Divider
Internal 63 kHz Synchronizable Oscillator
Average Current Mode PWM Control
Overvoltage Protection Comparator
High Current, Clamped Gate Driver

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