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H-grade full bridge DC/DC MCU gets adaptive ZVS update

Posted: 09 Apr 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Linear? DC/DC controller? ZVS delay? MOSFETs?

Analog IC manufacturer Linear Technology has recently unveiled the H-grade version of the LTC3722-1, a phase-modulated full bridge DC/DC controller with adaptive or manual zero voltage switching (ZVS). Ideal for isolated high power applications of up to several kilowatts, the device's ZVS delay control and adjustable synchronous rectification timing optimises efficiency while reducing transformer size and electromagnetic interference.

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

The LTC3722-1'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. It is available in an SSOP-24 package. The 1000-piece price starts at $6.24 each for the H-grade device.

Further information regarding the LTC3722-1 can be found here.





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