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MOSFETs simplify circuit design in VoIP equipment

Posted: 18 Nov 2009 ?? ?Print Version ?Bookmark and Share

Keywords:MOSFET? VoIP? broadband?


Diodes Inc. introduces a pair of n-channel MOSFETs offering designers of VoIP communications equipment a rugged solution that reduces circuit complexity and cost.

The ZXMN15A27K and ZXMN20B28K are designed to meet the requirements of the primary switch position in transformer-based subscriber line interface circuits (SLIC) with DC/DC converters in a variety of VoIP applications, including voice over broadband systems, PBX systems, cable and DSL gateways.

The devices feature breakdown voltages of 150V and 200V, respectively, and can withstand the high-pulse avalanche energy and commutation modes in the SLIC environment without the need for additional protection circuitry. With the right choice of transformer, these MOSFETs are capable of driving line voltages beyond 150V and supplying multiple subscriber lines at loop lengths exceeding 6km.

Low-input capacitance makes these MOSFETs easy to drive directly from the SLIC controlled IC with minimal or no buffering, further simplifying circuit design and reducing component count and cost. The ZXMN20B28K is also capable of low gate drive at logic level.

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