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Active bridge driver replaces lossy diodes

Alpha & Omega’s AOZ7203AV active bridge driver controls two external N-channel MOSFETs to replace two low-side diodes in an AC/DC bridge rectifier. The self-powered dual-driver IC can help improve efficiency and reduce standby power consumption when used in AC/DC adapters and power supplies.

“Today’s power-hungry gaming laptops, game consoles, and high-performance desktops demand high efficiency from the AC-DC power supply. Using the AOZ7203AV with AOS’ low-ohmic high-voltage external MOSFETs significantly improves the efficiency of the power converter as the typical rectifier-diode forward-conduction losses are reduced by 50%. Efficiency can improve up to about 0.7% at 90 V (AC) mains voltage,” said Armin Hsu, power IC senior marketing manager at AOS.

The AOZ7203AV is the latest member of the 600-V AlphaZBL family of active bridge drivers. In addition to minimizing forward-conduction losses, the part features ultra-low operating current, integrated X-capacitor discharge (CB safety certified), and a wide operating temperature range of -40°C to +125°C. A break-before-make function prevents shoot-through current when driving the low-side high-voltage MOSFETs in an active bridge rectifier circuit.

Available now in production quantities, the AOZ7203AV in 8-pin SO packages costs $1.68 each in lots of 1000 units.

AOZ7203AV product page

Alpha & Omega Semiconductor 

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