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PWM controller suits synchronous DC/DC apps

Posted: 14 Feb 2007 ?? ?Print Version ?Bookmark and Share

Keywords:PWM controller? PWM? DC/DC? IR? MOSFET?

IR3651 synchronous PWM control IC from IR

International Rectifier (IR) has 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 suitable for a wide range of applications including telecom and base station power supplies, networking servers, automotive and industrial control.

Protection features
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 undervoltage lockout are provided for required system-level reliability in the event of a fault condition. The device also offers synchronization that 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.

88% efficiency
"The IR3651, with a pair of IR's DirectFET MOSFETs, can achieve greater than 88 percent system efficiency at 48Vin and 3.3Vout at 6A without a heat sink or airflow," said Stephen Tsang, senior VP of Asia sales at IR. "Another advantage compared to similar devices on the market is IR3651's higher maximum input voltage rating, enabling a more robust and reliable design."

The IR3651 is available immediately. The devices are Pb-free and are compliant with the RoHS.

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