Power Integrations Adds New DPA-Switch to Power Emerging PoE Applications

Power Integrations, Inc. announced that it has extended its DPA-Switch® DC-DC IC family with the introduction of the 10W DPA422, which enables designers to develop efficient power supply designs for Power Over Ethernet (PoE) applications, and is especially suitable for Class 2 PoE implementations for applications such as VoIP telephones.

Andy Smith, Power Integrations Product Marketing Manager for the DPA-Switch family, explained, "Integrated PoE solutions available on the market are a costly answer to a simple requirement. In contrast, by using our DPA-Switch family plus a few low-cost discrete components, designers can achieve a similar solution – simply, reliably and cost-effectively."

Power Integrations claims that its DPA-Switch family is the only scaleable family of parts available that covers all current and proposed PoE classes from 3 to 30W and beyond. Rated at up to 10W output power, the new DPA422 has been specifically designed to meet the power requirements of IEEE802.3af Class 2 Powered Devices (PDs).

DPA-Switch family devices include a monolithic 220V MOSFET and feature voltage mode feedback control which requires no slope compensation, an internal, tight tolerance cycle-by-cycle current limit which needs no external current sense components and output overload and loop fault "auto-restart" protection. Other benefits include remote ON/OFF control, low EMI, high efficiency, soft start and hysteretic thermal shutdown. The DPA422 device is available in DIP-8, SMD 8 package.

DPA422P devices in the DIP-8 are priced at $0.97 in 10,000-piece volumes and are available immediately. As well as PoE implementations, these devices are well suited to dc-dc merchant power supply designs and as a low-cost alternative to power bricks.