Print  |  Send  |   

Isolated power factor corrected offline regulator needs no opto

October 11, 2011 // Christoph Hammerschmidt

Isolated power factor corrected offline regulator needs no opto

Linear Technology announces the LT3798, an isolated flyback controller with single stage active power factor correction (PFC). A power factor of greater than 0.97% is accomplished by actively modulating the input current eliminating the need for an extra switching power stage and associated components. In addition, no opto-isolator or signal transformer is required for feedback since the output voltage is sensed from the primary-side flyback signal.

A LT3798-based design easily complies with the IEC6100-3-2 Harmonic Current Emissions specification. Efficiencies greater than 86% can be achieved with output power levels up to 100W. The device's input voltage range is dependent on the choice of external components and it can operate over a 90VAC to 277VAC range, and can easily be scaled higher or lower. Furthermore, the LT3798 can be designed into high input voltage DC applications, making it well suited for industrial, EV/EHV automotive, mining and medical applications. The LT3798 utilizes mode operation enabling the use of a smaller transformer compared to continuous conduction mode designs, further reducing the solution size.

The LT3798 is available in a thermally enhanced 16-pin MSOP package. The LT3798E version operates from -40°C to 125°C, with 1000-piece price starting at $X.XX each. The LT3798I industrial grade version operates from -40°C to 125°C, with 1,000-piece pricing starting at $X.XX each. The LT3798H industrial grade version operates from -40°C to 150°C, with 1,000-piece pricing starting at $X.XX each. All are available from stock. For more information, visit



All news

Body Electronics,Power Management,Power Management,Power components,Infotainment

Follow us

Fast, Accurate & Relevant for Design Engineers only!

Technical papers     

Linear video channel


Read more

This month Ambiq Micro is giving away five of its 'Apollo EVB' evaluation boards, worth 9 each for EETimes Europe’s readers to assess the capabilities of their cutting-edge Apollo sub-threshold microcontroller.

The new suite of Apollo MCUs is based on the 32-bit ARM Cortex-M4 floating point microcontroller and redefines 'low power' with energy consumption that is typically five to...


Design centers     

Infotainment Making HDTV in the car reliable and secure

December 15, 2011 | Texas instruments | 222901974

Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.


You must be logged in to view this page

Login here :