ON Launches ICs For SMPS In Flat-Screen TVs

ON's range of products aimed at next-generation power-system design can be used in applications such as ATX power supplies, flat-screen televisions, high-power AC/DC adapters and gaming consoles. The NCP4303A and NCP4303 synchronous rectification controller and driver integrated circuits (ICs) targeted at use in Switch Mode Power Supplies (SMPS). Their features provide an efficient and flexible solution for secondary side rectification in SMPS.

The NCP4303 range provides MOSFET parasitic inductance compensation, enabling optimisation of a synchronous rectification system. Capable of a maximum operating frequency of 500kHz, these ICs feature high-current gate drivers along with high-speed logic circuitry to provide appropriately timed drive signals to the synchronous rectification MOSFET. The 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.

Externally adjustable minimum on and off times help to deal with the ringing induced by PCB layouts and other parasitic elements, resulting 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. It 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.

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