</a>PFC" title="PFC">PFC" title="PFC">PFC的反激控制器,功率因素大于0.97,不需要光耦合器,諧波低,恒流和恒壓調整,精度在±5%,無負載的功耗小于0.5W,和能源之星標準兼容,主要用在離線5W-100W電源,高DC VIN絕緣應用和離線總線轉換器(12V,24V或48V輸出).本文介紹了LT3798主要特性,框圖以及通用輸入24W和48W PFC電源電路圖.
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應用:
Offline 5W to 100W+ Applications
High DC VIN Isolated Applications
Offline Bus Converter (12V, 24V or 48V Outputs)
圖1. LT3798方框圖
圖2. LT3798通用輸入24W PFC總線電源電路圖
圖3. LT3798通用輸入48W PFC電源電路圖
詳情請見:
http://cds.linear.com/docs/Datasheet/3798p.pdf
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應用:
Offline 5W to 100W+ Applications
High DC VIN Isolated Applications
Offline Bus Converter (12V, 24V or 48V Outputs)
圖1. LT3798方框圖
圖2. LT3798通用輸入24W PFC總線電源電路圖
圖3. LT3798通用輸入48W PFC電源電路圖
詳情請見:
http://cds.linear.com/docs/Datasheet/3798p.pdf
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