International Rectifier, (IR)® introduced the IR1166 SmartRectifier IC for ac-dc power converters used in laptops, mini-PCs, LCD and PDP televisions, game systems, home theater audio, motor drive, and other digital computing and home entertainment systems. Enabling smaller and cooler supplies, the eight-pin IR1166 IC simplifies the design of mid-power secondary synchronous rectification (SR) circuits of resonant half-bridge converters and flyback converters designed for 50-150W discontinuous conduction mode (DCM), critical conduction mode (CrCM), and continuous conduction mode (CCM).
The IR1166 SmartRectifier IC works independently from the primary control and enables synchronous rectification so it can be used in a variety of transformer switching modes and applications with capacitive output filters. Furthermore, when "burst mode" occurs on the primary side, the secondary side remains unaffected, complying with California Energy Commission (CEC) 80Plus™ and "1W Standby."
This new device, based on IR's proprietary high voltage IC (HVIC) technology, is compatible with all MOSFET gate types, and offers a direct connection to a wide range of 40 to 200V SR MOSFETs. When used with IR's standard and logic-level HEXFET® power MOSFETs, the new IC reduces losses dissipated in the SR MOSFET by 50%, reducing the number of MOSFETs needed in the circuit or enabling the use of smaller packages, such as surface mount SO-8 parts. These optimized MOSFETs work with the IR1166 to create a "total chipset solution" to further maximize efficiency and power density in SR circuits.
In addition to the SmartRectifier IC, there will be an IRAC1166-100W 100W flyback converter reference design available that operates in CrCM. This reference design demonstrates the SmartRectifier features by resolving the output rectification function using a combination of one IR1166SPbF IC and two IRF7853 (SR) MOSFETs in parallel. The entire solution uses only three SO-8 packages for low-side output rectification and requires no heatsink.
The new IC is available immediately in an SO-8 package and soon in DIP-8 package, which are both lead-free (PbF) and compliant with the Restriction of Hazardous Substances Directive (RoHS). Unit pricing is US $0.70 each for the IR1166SPbF, IR1166STRPbF and IR1166PbF, in 10,000-unit quantities. Production quantities are available immediately.
