Power Integrations Expands Flyback Topology to 440 W with New TOPSwitchGaN IC Family
Power Integrations has introduced a new generation of flyback converter technology designed to significantly extend the power capabilities of this widely used power supply architecture. The company announced the launch of its TOPSwitchGaN™ integrated circuit family, a development that expands the maximum power range of flyback converters to 440 watts—a level traditionally associated with more complex resonant and LLC power designs.
The new devices combine the company’s PowiGaN™ gallium nitride switching technology with the well-known TOPSwitch™ integrated circuit architecture, creating a simplified yet highly efficient power conversion solution. By merging these two technologies, Power Integrations aims to help engineers design high-power supplies with fewer components, reduced thermal management requirements, and lower system costs.
A Shift in Power Supply Design
For decades, flyback converters have been widely used in low- and medium-power applications because of their simplicity, cost-effectiveness, and minimal component count. However, as power levels increase, designers have typically transitioned to more sophisticated architectures such as resonant or LLC converters. These alternative topologies can deliver higher efficiency at larger power levels but require more complex control circuits, additional components, and more challenging design processes.
With the introduction of the TOPSwitchGaN family, Power Integrations is challenging that conventional design path.
According to Silvestro Fimiani, the new technology allows engineers to rethink how they approach high-power power supply development.
He explained that for many years designers were forced to migrate to resonant topologies as power demands grew. The new devices enable flyback converters to operate in a power range previously considered impractical for the architecture. As a result, engineers can now achieve high performance and strong efficiency levels while maintaining the relative simplicity of flyback design.
This breakthrough effectively expands the applicability of flyback converters into markets that previously required more complex and expensive solutions.
High Efficiency Across Load Conditions
The TOPSwitchGaN devices deliver strong energy performance across a wide operating range. Power Integrations reports that the new ICs achieve approximately 92 percent efficiency across loads from 10 percent to full capacity.
In addition to strong operational efficiency, the devices are designed to meet stringent regulatory requirements for standby power consumption. The ICs comfortably satisfy European Energy-related Products (ErP) efficiency standards, achieving less than 50 milliwatts of power consumption in standby and off-mode conditions.
One notable advantage of the architecture is that these performance levels are achieved without the need for synchronous rectification, which is often used in high-efficiency power supply designs but adds cost and complexity.
Because of these characteristics, the new IC family is well suited for a variety of modern electronics and industrial systems. Potential applications include:
- High-end home appliances
- Electric bicycle chargers
- Industrial power systems
- Smart home equipment
- Consumer electronics power supplies
These applications increasingly demand compact power supplies with high efficiency and low standby consumption, particularly as global efficiency regulations continue to tighten.
PowiGaN Technology Drives Higher Power
At the core of the new devices is Power Integrations’ proprietary PowiGaN technology, which uses gallium nitride switches to deliver higher performance than traditional silicon-based components.
Gallium nitride offers significantly lower RDS(ON) resistance compared with conventional silicon power transistors. This reduction in resistance leads to lower conduction losses during operation. Lower losses translate directly into improved efficiency and the ability to support higher power output without excessive heat generation.
The integration of 800-volt PowiGaN switches into the TOPSwitchGaN ICs further enhances the performance of the devices. These switches provide strong surge-withstand capability, making the power supplies more resilient in demanding electrical environments. They also reduce switching losses, enabling operation at switching frequencies of up to 150 kilohertz.
Higher switching frequencies allow designers to reduce the size of magnetics components, such as transformers, which are often among the largest parts in a power supply. As a result, engineers can create more compact power supplies, which is particularly valuable in consumer electronics and space-constrained industrial products.
Extremely Low Standby Consumption
Standby efficiency has become a critical requirement for modern electronics, especially for devices that remain connected to power continuously. The new ICs are designed with very low no-load consumption to meet these demands.
Power Integrations reports that the devices achieve well below 50 milliwatts of no-load consumption at 230-volt AC input, even when including line-sense circuitry. In addition, the system can deliver up to 210 milliwatts of output power from only 300 milliwatts of input power while operating in standby mode.
This capability enables the power supply to run housekeeping functions, such as control circuitry, sensors, or communication modules, while maintaining extremely low overall energy consumption.
Continuing the TOPSwitch Legacy
The launch of TOPSwitchGaN builds on a long history of innovation within the TOPSwitch product line.
When it was first introduced in the 1990s, TOPSwitch helped transform power supply design by integrating multiple offline switching functions into compact packages. Since its introduction in 1994, billions of TOPSwitch devices have been deployed across consumer electronics, industrial systems, and household appliances.
According to Fimiani, the TOPSwitch brand has become synonymous with efficiency and ease of design for engineers developing power conversion solutions. By integrating PowiGaN technology into the established architecture, Power Integrations aims to extend those benefits into much higher power levels.
The result is an architecture that combines simplified design, high efficiency, and strong reliability, while enabling flyback converters to handle applications that were previously considered out of reach for the topology.
Packaging Options for Different Designs
To support a broad range of design requirements, the TOPSwitchGaN ICs are available in two different package styles.
One option is the low-profile eSOP™-12 surface-mount package, designed for compact and ultra-slim products. This package allows designers to deliver up to 135 watts of output power from a universal input range of 85 to 265 volts AC without the need for a heat sink. Such capabilities make it ideal for applications like modern appliances and compact consumer electronics.
The second package option is the eSIP™-7 vertical package, which minimizes the footprint on the printed circuit board. Despite its small size, the package offers thermal performance comparable to that of a traditional TO-220 package.
When paired with a simple clip-mounted metal heat sink, the eSIP-7 package can support the extended Power Integrations range of the TOPSwitchGaN family. This configuration allows designers to achieve outputs approaching the 440-watt upper limit, making it suitable for demanding applications such as:
- Power tools
- Electric bicycle chargers
- Garage door openers
- Industrial equipment
Design Compatibility and Flexibility
Another advantage of the new IC family is its compatibility with existing Power Integrations products. The TOPSwitchGaN devices are pin-to-pin compatible with TinySwitch™-5 offline switcher ICs, allowing engineers to maintain familiar design approaches while scaling their power levels.
This compatibility enables designers to apply the same development methodology across a wide range of Power Integrations outputs, from as low as 10 watts up to 440 watts. The consistent architecture helps shorten design cycles and simplifies the process of creating product families with different Power Integrations ratings.
Pricing and Reference Designs
Power Integrations has also released several reference designs to help engineers quickly evaluate the capabilities of the new devices and accelerate product development.
Pricing for the TOPSwitchGaN ICs starts at approximately $1.00 per unit in quantities of 10,000, making them competitive for high-volume manufacturing.
Available reference designs include:
- DER-1079 – a 60-watt isolated flyback power supply designed for appliance applications using the TOP7074K device.
- DER-1019 – a 356-watt high-line industrial flyback power supply delivering 89 volts at 4 amps based on the TOP7078E IC.
- RDK-1018 – a 168-watt isolated flyback charger design for e-bikes built around the TOP7075E device.
These design resources provide schematics, performance data, and development guidance to help engineers integrate the technology into their products.
Expanding the Role of Flyback Converters
With the launch of the TOPSwitchGaN family, Power Integrations is effectively expanding the capabilities of one of the most widely used power supply topologies.
By enabling flyback converters to operate at power levels up to 440 watts while maintaining high efficiency and low standby consumption, the company is opening new possibilities for simpler, more compact power supply designs.
For engineers developing next-generation electronics, appliances, and industrial equipment, the technology offers a compelling combination of higher power density, lower system complexity, and reduced cost, potentially redefining how high-power AC-DC conversion is implemented in many modern applications.
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