Low-noise, high-efficiency diodes solve EMI and distortion challenges in power amplifiers

Power Integrations now offers its 200V Qspeed diodes – LQ10N200CQ and LQ20N200CQ. These devices are now available with AEC-Q101 automotive qualification. Qspeed silicon diodes use merged-PIN technology to provide a unique balance of soft switching and low reverse recovery charge. This produces low EMI and reduced output noise, which is particularly relevant for in-vehicle audio systems.

The newly-qualified 200V diodes feature what is claimed to be the industry’s lowest reverse recovery charge, typically 32.4nC at TJ of 125C, and a diode softness ratio of 0.39. This reduces high-frequency EMI inherent in the Schottky rectifiers frequently used in Class-D power amplifier output stages. Dual 10A and 20A common-cathode diodes are housed in an industry-standard, rugged DPAK TO-252 package.

Comments Edward Ong, product marketing manager at Power Integrations: “The automotive audio industry has been clamouring for an alternative to Schottky diodes with their ‘snappy’ reverse recovery, which causes ringing that generates EMI and noise in sensitive Class D amplifiers. Our automotive-qualified 200 V QSpeed diodes are the perfect solution for in-car audio amplification applications.”