The LT3575 operates in boundary mode, which is a variable frequency current-mode control switching scheme, typically resulting in +/-5% regulation over the full line, load and temperature range. Boundary mode also permits the use of a smaller transformer compared to equivalent continuous conduction-mode designs. The output voltage is easily set by two external resistors and the transformer turns ratio. Several off-the-shelf transformers, identified in the data sheet, can be used for numerous applications. The high level of integration and the use of boundary-mode operation results in a simple, clean application solution to the traditionally tough problem of isolated power delivery.
Additional features include an onboard low dropout regulator for IC power, programmable soft-start, undervoltage lockout, adjustable current limit and output voltage temperature compensation.
The LT3575 is available in a small thermally enhanced TSSOP-16 package and is offered in an extended and industrial operating junction temperature range from -40°C to 125°C. Pricing starts at $3.50 each in 1000-piece quantities. For more information, visit www.linear.com/3575.
Summary of Features: LT3575
* VIN Range from 3V to 40V
* Onboard 2.5A, 60V Integrated Power Switch
* No Transformer, Third Winding or Opto-Isolator Required for Feedback
* Current-Mode Control
* Boundary-Mode Operation
* VOUT Set with Two External Resistors
* Off-the-Shelf Transformers
* Programmable Soft-Start
* Programmable Undervoltage Lockout
* Output Voltage Temperature Compensation
* Adjustable Current Limit