LT1425 - Isolated Flyback Switching Regulators

The LT®1425 is a monolithic high power switching regulator specifically designed for the isolated flyback topology. No “third winding” or optoisolator is required; the integrated circuit senses the isolated output voltage directly from the primary side flyback waveform. A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry. The LT1425 operates with input supply voltages from 3V to 20V and draws only 7mA quiescent current. It can deliver output power up to 6W with no external power devices. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. The LT1425 has a number of features not found on other switching regulator ICs. Its unique control circuitry can maintain regulation well into discontinuous mode in most applications. Optional load compensation circuitry allows for improved load regulation. An externally activated shutdown mode reduces total supply current to 15µA for standby operation.

特点
  • No Transformer
  • ±5% Accurate Output Voltage Without User Trims (See Circuit Below)
  • Resistor Programmable Output Voltage
  • Regulation Maintained Well Into Discontinuous Mode (Light Load)
  • Optional Load Compensation
  • Operating Frequency: 285kHz
  • Easily Synchronized to External Clock
  • Available in 16-Pin Narrow SO Package
典型应用
LT1425 Typical Application
LT1425 Typical Application
应用
  • Isolated Flyback Switching Regulators
  • Ethernet Isolated 5V to -9V Converter
  • Medical Instruments
  • Isolated Telecom Supplies
封装信息
LT1425 Package Drawing
Order Information 订购型号
器件型号封装温度价格 (以 1 ~ 99 片为批量)价格 (以 1000 片为批量) *
LT1425CS#PBFSO-16C$3.55$2.90
LT1425CS#TRPBFSO-16C$2.96
LT1425IS#PBFSO-16I$4.90$3.95
LT1425IS#TRPBFSO-16I$4.01
演示电路板
器件型号描述价格
DC159A-ALT1425CS | ISOLATED FLYBACK CONVERTER, 5V to 15V INPUT, +/- 5V OUTPUT @ 220 mA$125.00
DC159A-BLT1425CS | ISOLATED FLYBACK CONVERTER, 5V to 15V INPUT, +/- 15V OUTPUT @ 60mA$125.00
数据表
规格变更通知书
应用指南
设计要点
可靠性数据
CAD 符号
相关产品
LT1425 - Isolated Flyback Switching Regulators
LT1425 - SPECIFICATION NOTICE
AN84 - Linear Technology Magazine Circuit Collection, Volume IV
DN158 - Isolated DC/DC Conversion with the LT1425
R387 Reliability Data
LT1425 Footprints and Symbols