The LTC3765 and LTC3766 synchronous forward converter chipset features active clamp reset and Direct Flux Limit that prevents power transformer saturation under all conditions. The LTC3765 is a primary-side intelligent controller that works in concert with the LTC3766 to implement a self-starting isolated power supply. After start-up, the LTC3765 receives timing signals and bias power from the secondary-side LTC3766 controller through a tiny pulse transformer. The LTC3765/LTC3766 contains control circuitry to implement an active clamp transformer reset technique enabling efficiencies up to 96% and greater power densities when compared to conventional catch winding or resonant reset techniques. Additional features include an average current limit, fixed-frequency adjustable operation from 75 kHz to 500 kHz, clean start-up into pre-biased loads, multiphase operation for high power designs, over-temperature protection, and true remote output voltage sense. The LTC3765 is available in a thermally enhanced MSOP-16 package while the LTC3766 comes QFN-28 and SSOP-28 packages. Prices start at $1.55 and $2.60 each/1,000, respectively. LINEAR TECHNOLOGY CORP., Milpitas, CA. (800) 454-6327.