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Resonant mode controller enables compact power design

Posted: 22 May 2007 ?? ?Print Version ?Bookmark and Share

Keywords:resonant mode controller? compact power design? adjustable switching frequency?

ON Semi's NCP1396 resonant mode controller

ON Semiconductor has introduced NCP1396, a high performance resonant mode controller featuring built-in high side and low side MOSFET drivers. The device enables compact design of a reliable and highly efficient power supply for different applications including flat panel display power converters, high power density AC/DC adapters, industrial power sources and game consoles.

The architecture of the NCP1396 includes a 500kHz voltage controlled oscillator. Because it is important to stay away from the resonating peak in resonant topologies so as to keep operating the converter in the right region, NCP1396 features an adjustable and accurate minimum switching frequency. Supported by proprietary high voltage technology, this controller welcomes a bootstrapped MOSFET driver for half bridge applications accepting bulk voltages up to 600V. An adjustable dead time helps to fight cross-conduction between the upper and the lower transistor and also insures zero voltage switching (ZVS) operation for the primary switches under all load conditions. A skip-cycle mode can be easily implemented to improve standby power and no-load operation efficiency.

NCP1396 offers enhanced protection with multiple protection features that contribute to a safer converter design, without engendering additional circuitry complexity. Among the enhanced protection features of the NCP1396, are broken feedback loop detection, fast and slow events inputs and brown-out detection to avoid operation from a low input voltage.

Designed for power supply applications, the NCP1396 is available in two versions. NCP1396A is designed for high power consumer applications and the NCP1396B is ideal for power industrial supplies.

NCP1396 updates the NCP1395 as a key component in ON Semiconductor's open GreenPoint reference design for 220W LCD TV power supplies. A complete reference design documentation package is available, including description, schematic, BOMs, Gerber images and evaluation results.

Offered in an SOIC-16 package, NCP1396 is priced at $1.60 each in 2,500-unit quantities. NCP1396 will soon be offered in a PDIP-16 package.

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