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Rectification drivers target SMPS applications

Posted: 14 May 2010     Print Version  Bookmark and Share

Keywords:rectification driver  switch-mode power supplies  SMPS  MOSFET 

NCP4303A rectification driver

ON Semiconductor has launched the NCP4303A and NCP4303B full-featured synchronous rectification controller and driver ICs that are versatile to be used in various power topologies, such as flyback, forward and half-bridge resonant LLC.

The ICs are targeted for use in switch-mode power supplies (SMPS) for applications such as ATX power supplies, flat-screen TVs, high-power AC/DC adapters and gaming consoles. The devices' unique features provide efficient and flexible solution for secondary side rectification in SMPS.

Capable of a maximum operating frequency of 500kHz, these new ICs feature high current gate drivers along with high-speed logic circuitry to provide appropriately timed drive signals to the synchronous rectification MOSFET. The extremely low turn-off delay time of 40ns typical, combined with the high sink current capability of the drivers and the automatic package parasitic inductance compensation system allow synchronous rectification MOSFET conduction time to be maximised—thus increasing the efficiency of the SMPS.

Externally adjustable minimum on and off times (which are independent of the Vcc level) help to deal with the ringing induced by PCB layouts and other parasitic elements. This results in reliable, noiseless operation. The NCP4303 also features a trigger input that can be used to interface with the primary side of the power supply, allowing use in constant current applications.

The NCP4303 is available with two different gate drive clamp voltages to tailor to the characteristics of different synchronous MOSFETs available on the market. The NCP4303A has a gate drive clamp of 12V, while the NCP4303B has a 6V gate drive clamp.

"The pressure being placed on engineers to improve power supply efficiency is greater than ever," said Christophe Warin, ON Semiconductor business unit manager for AC/DC power conversion products. "The NCP4303 product family provides unique features such as our patented MOSFET parasitic inductance compensation. This feature provides a new method for optimising the efficiency of a synchronous rectification system."

Both the NCP4303A and NCP4303B are offered in Pb-free, 8-pin SOIC packages. Pricing for both devices is Rs.19.86 ($0.43) per unit in quantities of 10,000 units.

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