特点
Drives External Power MOSFET with External I
SENSE
Resistor
Application Input Voltage Limited Only by External Power Components
Senses Output Voltage Directly from Primary Side Winding—No Optoisolator Required
Accurate Regulation Without User Trims
Regulation Maintained Well into Discontinuous Mode
Switching Frequency from 50kHz to 250kHz with External Capacitor
Available in 16-Pin SO and SSOP Packages
Optional Load Compensation
Optional Undervoltage Lockout
典型应用
典型应用
描述
The LT1725 has a number of features not found on most other switching regulator ICs. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. Its unique control circuitry can maintain regulation well into discontinuous mode in most applications. Optional load compensation circuitry allows for improved load regulation. An optional undervoltage lockout pin halts operation when the application input voltage is too low. An optional external capacitor implements a soft-start function. A 3V output is available at up to several mA for powering primary side application circuitry.