Switching regulator suits automotive applications

Linear Technology has announced the LT3575, an isolated monolithic flyback switching regulator suitable for industrial, medical, telecom, datacom and automotive applications.

The LT3575 is said to significantly simply 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 3V to 40V input voltage range, has a 2.5A power switch and delivers up to 14W of output power.

It operates in boundary mode, which is a variable-frequency current-mode control-switching scheme, typically resulting in +/-5 per cent regulation over the full line, load and temperature range.

Boundary mode also permits the use of a smaller transformer compared with 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 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, under-voltage 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 -40C to +125C.

Back to top