Linear LT3798通用输入绝缘48W电源解决方案
Linear公司的LT3798是绝缘无光耦带PFC的反激控制器,功率因素大于0.97,不需要光耦合器,谐波低,恒流和恒压调整,精度在±5%,无负载的功耗小于0.5W,和能源之星标准兼容,主要用在离线5W-100W电源,高DC VIN绝缘应用和离线总线转换器(12V,24V或48V输出).本文介绍了LT3798主要特性,框图以及通用输入24W和48W PFC电源电路图.
Isolated No Opto-Coupler Flyback Controller with Active PFC
The LT®3798 is a constant voltage/constant current isolated flyback controller that combines active power factor correction (PFC) with no opto-coupler required for output voltage feedback into a single-stage converter. A LT3798 based design can achieve a power factor of greater than 0.97 by activELy modulating the input current, allowing compliance with most Harmonic Current Emission requirements.
The LT3798 is well suited for a wide variety of off-line applications. The input range can be scaLED up or down, depending mainly on the choice of external components.
Efficiencies higher than 86% can be achieved with output power levels up to 100 watts. In addition, the LT3798 can easily be designed into high DC input applications.
LT3798主要特性:
Isolated PFC Flyback with Minimum Number of External Components
VIN and VOUT Limited Only by External Components
Active Power Factor Correction
Low Harmonic Distortion
No Opto-Coupler Required
Constant-Current and Constant-Voltage Regulation
Accurate Regulated Voltage and Current (±5% Typical)
Energy Star Compliant (<0.5W No Load Operation)
Thermally Enhanced 16-lead MSOP Package
LT3798应用:
Offline 5W to 100W+ Applications
High DC VIN Isolated Applications
Offline Bus Converter (12V, 24V or 48V Outputs)
图1. LT3798方框图
图2. LT3798通用输入24W PFC总线电源电路图
图3. LT3798通用输入48W PFC电源电路图
Isolated No Opto-Coupler Flyback Controller with Active PFC
The LT®3798 is a constant voltage/constant current isolated flyback controller that combines active power factor correction (PFC) with no opto-coupler required for output voltage feedback into a single-stage converter. A LT3798 based design can achieve a power factor of greater than 0.97 by activELy modulating the input current, allowing compliance with most Harmonic Current Emission requirements.
The LT3798 is well suited for a wide variety of off-line applications. The input range can be scaLED up or down, depending mainly on the choice of external components.
Efficiencies higher than 86% can be achieved with output power levels up to 100 watts. In addition, the LT3798 can easily be designed into high DC input applications.
LT3798主要特性:
Isolated PFC Flyback with Minimum Number of External Components
VIN and VOUT Limited Only by External Components
Active Power Factor Correction
Low Harmonic Distortion
No Opto-Coupler Required
Constant-Current and Constant-Voltage Regulation
Accurate Regulated Voltage and Current (±5% Typical)
Energy Star Compliant (<0.5W No Load Operation)
Thermally Enhanced 16-lead MSOP Package
LT3798应用:
Offline 5W to 100W+ Applications
High DC VIN Isolated Applications
Offline Bus Converter (12V, 24V or 48V Outputs)
图1. LT3798方框图
图2. LT3798通用输入24W PFC总线电源电路图
图3. LT3798通用输入48W PFC电源电路图