PIN power diodes combine low recovery losses and softness for efficiency and low EMI

May 16, 2013 // By Paul Buckley
Power Integrations’ 200 V Qspeed silicon diodes exceed the performance of Schottky and trench Schottky devices, offering ‘soft’ switching characteristics that are beneficial for high-efficiency, high-frequency power supply secondary rectifiers and audio amplifiers

Power Integrations has introduced the LQA200 series of 200 V diodes. The company’s Qspeed high-performance silicon diodes are based on merged-PIN technology that offers ‘soft’ switching and low reverse recovery charge (Qrr). This balance of features enables high-frequency operation and permits the use of small, inexpensive magnetic components while maximising operational efficiency. Available from 10 A to 40 A in common-cathode configuration, these “soft” 200 V diodes reduce peak reverse voltage, increasing voltage margin and enhancing operational reliability and ruggedness. The need for snubber capacitors is also reduced or even eliminated, which further improves efficiency and lowers cost. Designers can make a trade-off between board area/compoient count and marginal circuit efficiency. When compared with equivalent Schottky products, the Qspeed diodes reduce Qrr by up to 80%, and have a 45% lower junction capacitance.

Klaus Pietrczak, product marketing manager for Power Integrations, commented: “Our new LQA200 diodes are suitable for use in power-supply output rectification circuits for hard- or soft-switching applications such as telecom power supplies and audio amplifiers. By reducing the levels of EMI produced, designers can save space and component cost as well as improve performance with a more elegant design.”

LQA200 diodes are available in DPAK, D2PAK and TO-220 packages, and cost from $0.40 to $1.20 (10,000).

Power Integrations,