Intersil Corp. (Milpitas, CA) debuted its new ISL6744 double-ended controller for unregulated bus converters in 48 V dc-dc and off-line ac-dc power supplies. The ISL6744 integrates all of the control and protection features required to improve performance and reduce costs for the rapidly-growing isolated power bus converter market. The ISL6744 controller works over a wide range of input voltages bringing high performance and cost savings to isolated-bus applications, including 400 V power-factor-corrected ac-dc converters and 48 V intermediate buses for telecom, datacom and server systems.
The new converter IC has been designed to provide efficiency optimization with its ability to accurately program the output drive signals' non-overlap time with delays as fast as 20 ns. This performance allows power engineers to optimize the efficiency of their power modules and achieve conversion efficiencies greater than 95%. In addition to high conversion efficiency, the ISL6744 provides an adjustable oscillator frequency, adjustable soft-start, over-current shutdown, and precise control of the switching frequency. It features low startup and operating currents, operation up to 1 MHz, integrated 20 V/1 A MOSFET drivers, and fast propagation delays, all in a eight-lead MSOP or SOIC package.
Pricing for 1,000-unit quantities is $1.30 for the ISL6744AU (MSOP package) and $1.20 for the ISL6744AB (SOIC package).
