Isolated Monolithic Flyback Regulator Simplifies Design & Eliminates Optocoupler
- 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
The LT3575LT3575 is an isolated monolithic flyback switching regulator that significantly simplifies the design of an isolated DC/DC converter. No opto-isolator, third winding or signal transformer is required for feedback since the output voltage is sensed from the primary-side flyback signal. The LT3575LT3575 operates over a 3V to 40V input voltage range, has a 2.5A power switch and delivers up to 14 Watts of output power.
LT3575EFE#PBFLT3575EFE#PBF Schematic
The LT3575LT3575 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 high level of integration and the use of boundarymode 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 LT3575LT3575 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.
More info on www.linear.com/3575 or go to Design Kit Demoboard
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