LT3575 - Isolated Monolithic Flyback Regulator

sleuz — Sun, 27 Oct 2013 02:57:12 GMT

Current Revision posted to Documents by sleuz on 10/27/2013 2:57:12 AM

Isolated Monolithic Flyback Regulator Simplifies Design & Eliminates Optocoupler

V_INRange 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
V_OUT 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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Attachments:

community.element14.com/.../6036.LTspice_5F00_Quick_5F00_Start.pdf	LTspice_Quick_Start.pdf
community.element14.com/.../3617.WE_5F00_Library_5F00_LTspice.zip

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