Isolated monolithic flyback regulator simplifies design, eliminates optocoupler
August 02, 2010 // Paul Buckley
Linear Technology Corporation has unveiled an isolated monolithic flyback switching regulator that simplifies the design of an isolated DC/DC converter.
No opto-isolator, third winding or signal transformer are required for feedback since the output voltage is sensed from the primary-side flyback signal. The LT3575 operates over a 3 V to 40 V input voltage range, has a 2.5 A power switch and delivers up to 14 Watts of output power, making it well suited for a wide variety of industrial, medical, telecom, datacom and automotive applications.
The LT3575 operates in boundary mode, which is a variable frequency current-mode control switching scheme, typically resulting in +/-5 percent 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.
Summary of Features: LT3575
- VIN Range from 3 V to 40 V
- Onboard 2.5 A, 60 V 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
Related link: LT3575 All news
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