Application-specific diodes give more efficient PFC

30 July 2003 Power Electronics / Power Management Asset Management

International Rectifier's ETX- and ETL-Series devices are high efficiency diodes for active power factor correction (PFC) in switch mode power supply applications. Power factor correction circuits smooth out the pulsating AC mains current. PFC is legislated under IEC-6100-3-2 standards. The ETX- and ETL-Series diode's characteristics are fine-tuned for maximum efficiency in the specific PFC applications. The PFC-specific diodes enable lower system losses (less heat), and lower stress in switching components in power supplies. This shrinks circuits and creates higher current density for space-restricted, high performance applications. The ETX-Series diodes have very low reverse recovery charge for continuous current mode (CCM) PFC, while the ETL-Series diodes have very low forward voltage drop for discontinuous current mode (DCM) PFC applications. The CCM scheme is used in power supplies rated at 200 W or higher. DCM PFC schemes are more common in power supplies in the 70 to 200 W range.

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