基于LT3748設計的絕緣反激拓撲開關電源控制技術(shù)
本文介紹了LT3748主要特性,方框圖以及25W/12V通信電源,汽車IGBT控制電源,±300V 絕緣反激轉(zhuǎn)換器和輸入24-96V輸出48V/0.5A 電源。Linear 公司的LT3748是開關電源控制器,特別設計用于絕緣反激拓撲和大功率開關電源。輸入電壓5V-100V,平均柵極驅(qū)動源電流和沉電流1.9A,能驅(qū)動低邊外接功率MOSFET,不需要第三個繞組或光隔離器,并具有可編的軟起動,主要用于絕緣的通信轉(zhuǎn)換器,大功率汽車電源和絕緣工業(yè)電源。
LT3748主要特性:
5V to 100V Input Voltage Range
1.9A Average Gate Drive Source and Sink Current
Boundary Mode Operation
No Transformer Third Winding or Opto-Isolator Required for Regulation
Primary-Side Winding Feedback Load Regulation
VOUT Set with Two External Resistors
INTVCC Pin for Control of Gate Driver Voltage
Programmable Soft Start
Programmable Undervoltage Lockout
Available in MSOP Package
LT3748應用:
Isolated Telecom Converters
High Power Automotive Supplies
Isolated Industrial Power Supplies
圖1。LT3748方框圖
圖2。LT3748 25W/12V通信電源框圖
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