Alpha and Omega launch 100V FETs for flyback SR


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AO4290A and AON6220 100V MOSFETs

Alpha and Omega Semiconductor, a designer, developer, and supplier of power semiconductors and power ICs, announced the release of two new products in the 100V MOSFET family, AO4290A and AON6220. These products are designed for synchronous rectification for flyback converters, used in high-speed charger and PD adapters. Both parts are designed to be fully driven with 4.5V gate drive voltage.

The AO4290A is offered in an SO-8 package with a maximum on-resistance (Rdson) of 7.6mohm at 4.5V gate drive voltage. The AON6220 is packaged in a low profile DFN5x6 package with a maximum Rdson of 7.4mohm at 4.5V gate drive voltage. The minimum break down voltage is 100V, which is suitable for usage in flyback circuit designs featuring adjustable output voltage, such as an adaptive quick charge for mobile phones and USB PD adapters.

High-capacity batteries extend the mobility of the newest smart phones and laptop computers, and have driven the demand for high power chargers and adapters. Synchronous rectification has become the standard circuit design of choice for more and more flyback converters by enabling higher efficiency and lower heat generation while keeping the charger or adapter slim with improved power density. The latest digitally-controlled synchronous rectifier ICs provide an option to fully eliminate the Schottky diode paralleled with the synchronous MOSFET. This also requires further reduction of the MOSFET switching loss.

The AO4290A and AON6220 are designed to address the demand for higher output power and lower switching loss. With similar specs provided in both the SO-8 and DFN5x6 packages, the design engineer has more flexibility in selecting the right part in accordance with the target thermal dissipation and manufacturing requirements from the PCB factories.

‟The power supply industry sees a tremendous acceleration in the adoption of synchronous rectification in flyback applications. It has been proven to be an effective way of reducing heat generation and achieving a compact design. The evolution in Quick Charge and Direct Charge continues to drive new demand.

The standardization of USB Type C is propelling the output power to a higher level. AOS has been the major supplier from the first generation of fast chargers. Our AlphaSGTTM technology provides the solutions for both 5V fixed voltage and 5V/9V/12V/20V adaptive voltage topologies. These two newly released parts will help our partners and customers design high-efficiency flyback converters,” said Lei Feng, Sr. Marketing Director of MOSFET product line at AOS.

All the products released are immediately available in production quantities with a lead-time of 12-14 weeks.

Alpha and Omega Semiconductor