Phase modulated full-bridge controller features wide operating temperature range

April 09, 2013 // By Christoph Hammerschmidt
With the the H-grade version of its LTC3722-1 a phase-modulated full bridge DC/DC controller with adaptive or manual zero voltage switching (ZVS), Linear Technology makes this IC available for applications subjected to high ambient temperatures.

The LTC3722-1's ZVS delay control and adjustable synchronous rectification timing optimize efficiency while reducing transformer size and electromagnetic interference, making it well suited for isolated high power applications of up to several kilowatts.

The chip's adaptive zero voltage technology is accomplished by sensing the bridge MOSFETs and input voltage, allowing the converter to adapt to any change in load current, temperature, component tolerances, driver circuitry delay or input voltage variations. Additional features include fixed frequency current mode control, adjustable current limit, leading edge blanking, soft start, short-circuit protection and programmable slope compensation. An accurate 5V low dropout regulator provides up to 15mA to power auxiliary circuits.

The H-grade version operates up to a junction temperature of 150°C, compared to the E- and I-grade versions'
85°C maximum junction temperature. The H-grade product is tested and guaranteed to the maximum junction temperature of 150°C, making it ideal for automotive and industrial applications which are subjected to high ambient temperatures.

The LTC3722-1 is available in an SSOP-24 package. The 1000-piece price starts at $6.24 each for the H-grade device. For more information, visit