IR's PWM Control IC Addresses Synchronous Buck Applications With Wide Input Voltage Range
El Segundo, CA - International Rectifier ("IR") recently introduced the IR3651, a synchronous PWM control IC designed for high performance synchronous DC-DC buck applications with an input voltage range up to 75V. With programmable switching frequency up to 400kHz, the IR3651 is ideal for a wide range of applications including telecom and base-station power supplies, networking servers, automotive and industrial control.
"The IR3651, with a pair of IR's DirectFET® MOSFETs, can achieve greater than 88% system efficiency at 48Vin and 3.3Vout at 6A without a heatsink or airflow," said Rami Hamze, senior marketing manager for IR's DC-DC Computing Products. "Another advantage compared to similar devices on the market is IR3651's higher maximum input voltage rating, enabling a more robust and reliable design," he added.
The IR3651 is designed to drive a pair of external N-channel MOSFETs up to 25A. Protection features such as programmable soft-start, hiccup current limit and under-voltage lockout are provided for required system-level reliability in the event of a fault condition. The device also offers synchronization which allows simplified system-level EMI filter design.
The new controller includes a 150V half-bridge driver that allows for considerable design flexibility. For instance, the device may be used in low power (less than 60W) non-isolated DC-DC converters for network equipment as well as high power (greater than 200W) pre-regulator stages in regulated isolated converters. As a result, the IR3651 can be applied to designs for 36V inkjet printers, 28V aerospace applications, 24V electric bicycles, 72V battery systems, 18V wall bricks, 12V secondary-side post regulators and general purpose high-voltage, non-isolated DC/DC converters.
Data sheets, online design tools, and demonstration board information are posted on-line. For more information, you can go to http://www.irf.com/whats-new/nr070208.html.
SOURCE: International Rectifier