QuarEgg®

Zero Voltage Switching Architecture for Efficient AC/DC Flyback Converters

Best for AC/DC < 140W

QuarEgg is a ZVS flyback architecture that uses pulses from secondary side reflected on primary side to discharge FET parasitic capacitance forcing ZVS.

QuarEgg has been designed to offer better efficiency than both active clamp and quasi resonant flyback converters, while ensuring optimized costs in line with those of quasi resonant architectures.

QuarEgg can also lower standby power consumption to less than 18mW – reducing stress on secondary side MOSFETs for lower cost and better performance – and minimize EMI thanks to very smooth transitions.

Key features

Forced Zero Voltage Switching (ZVS) under every load condition
Up to 95% efficiency at full load
Up to 92% efficiency at light load
<18mW standby power consumption
No need for high-voltage high-side clamping MOSFET
Low EMI
Reduced voltage stress on secondary side MOSFET
Smaller size for up to 30W/in³ power density

Typical applications

Best suited for small AC/DC power converters.

Smartphones

Tablets

Laptops

Home assistants

Routers

Set top boxes

Small printers

Small LED drivers

IoT

Available configurations

Controllers

QuarEgg

EPIC2

EPIC2ACQ01

Secondary side ZVS flyback controller

Integrated USB Power Delivery 3.1
Integrated synchronous rectification
No optocoupler needed

QFN40
6mm x 6mm
40 pins

QuarEgg

EPIC Lite

EPIC1ADQ01

Primary side ZVS flyback controller

Peak efficiency > 94%
Light load efficiency >90%
Stand-by power consumption < 18mW

QFN32
5mm x 5mm
32 pins

Reference Designs

30W AC/DC Fixed voltage output

ERD00696

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Features

Synchronous ZVS flyback
Power density uncased 18.07W/in^3
Peak efficiency 94%

36W AC/DC Power Delivery

ERD00713

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Features

Synchronous ZVS flyback - PD 3.1
Robust and highly efficient design
Peak efficiency 94%

60W AC/DC Power Delivery

ERD00705

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Features

Synchronous ZVS flyback - PD 3.1
Robust and highly efficient design
Peak efficiency 94%

70W AC/DC Power Delivery

ERD00714

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Marketing Consent

Having read the privacy policy, I authorize, by ticking the corresponding box, to the processing by Company of the personal and contact data for marketing and advertising communication purposes, on promotional sales initiatives, carried out through automated contact methods (e-mail, SMS, instant messaging, social accounts of the Company, push notifications, services and tools made available by social networks and other mass messaging tools, etc.) and traditional contact methods (for example, telephone call with operator).

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Name

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Having read the privacy policy, I authorize, by ticking the corresponding box, to the processing by Company of the personal and contact data for marketing and advertising communication purposes, on promotional sales initiatives, carried out through automated contact methods (e-mail, SMS, instant messaging, social accounts of the Company, push notifications, services and tools made available by social networks and other mass messaging tools, etc.) and traditional contact methods (for example, telephone call with operator).

Features

No PFC, Synchronous ZVS flyback - PD 3.1
Power density uncased 26.44W/in^3
Peak efficiency 94,5%