Design challenges and high costs? PI GaN series INN3-EP helps you avoid pitfalls in industrial auxiliary power supply design.

GaN has significant advantages over traditional Si MOS.

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• InnoSwitch3-EP Industrial Auxiliary Power Supply Application Market

In industrial automation, smart grids, and energy storage devices, auxiliary power supplies act like "nerve endings," providing stable power to critical components such as control systems, sensors, and actuators. Their reliability, efficiency, and integration directly determine the operational accuracy and lifespan of industrial equipment. Among the series of GaN products launched by Power Integrations (PI), the InnoSwitch3-EP (INN3-EP) stands out as the preferred solution for industrial auxiliary power supply design due to its core features specifically designed for industrial scenarios, providing both high efficiency and stability for industry applications.

Why is the INN3-EP suitable for industrial applications?

The InnoSwitch3-EP is a highly integrated offline flyback switch IC designed for industrial and high-reliability applications. It integrates three core technologies: PowiGaN™ gallium nitride technology, FluxLink™ isolated feedback, and secondary-side control, providing efficient power solutions ranging from 15-100W. It is widely used in PLCs, servo drives, industrial robots, smart grid equipment, and other scenarios. Compared to traditional Si MOS, the INN3-EP (GaN) industrial auxiliary power supply design offers five key advantages:

1. Improved energy efficiency: Full load efficiency up to 90-95%, no-load power consumption as low as <70mW, reducing energy consumption of industrial equipment and meeting green factory standards.

2. Reduced size: High integration and PowiGaN™ technology reduce the power supply size by 40%, providing 100W output without the need for a heatsink, making it suitable for compact industrial equipment.

3. Enhanced reliability: Secondary-side control + multiple protections + wide temperature range design meet the long life requirements of industrial equipment.

4. Cost optimization: BOM costs are reduced by 20%, production efficiency is improved, and heat dissipation and space costs are reduced.

5. Simplified design: No optocouplers required, fewer external components, development cycle shortened by 50%, and engineering costs reduced.

According to the engineering report provided on PI's official website, a multi-dimensional parameter comparison is made between the INN3-EP and a traditional Si MOS-designed 65W adapter:

(RDR-747 INN3679C 750V Powi-GaN)

(DER-243 TOP269EG 750V Si Mos)

(RDR-747 INN3679C 750V Powi-GaN)

(DER-243 TOP269EG 750V Si Mos)

1. Highly integrated and compact: Maintains constant high efficiency across the entire load range, delivering up to 100W of output power without the need for a heatsink.

2. EcoSmart™ – High efficiency and energy saving: With no-load power consumption of less than 30mW when the input voltage detection circuit is working, it easily meets all global energy efficiency standards.

3. Advanced protection/safety features: Fast input undervoltage/overvoltage protection, automatic restart protection in case of output overvoltage fault, and excellent surge protection suitable for industrial power supply designs or designs with a larger safety margin.

4. Fully compliant with all safety regulations: insulation strength >4000VAC, 100% of products undergo HIPOT (high voltage insulation) testing, and pass UL1577 insulation strength 4000VAC (maximum), TUV (EN62368-1), CQC (GB4943.1) and DIN EN IEC 60747-17 (VDE 0884-17) safety certifications.

INN3-EP Output Power Comparison Table

INN3-EP Industrial Auxiliary Power Supply PCB Layout Considerations

1. Minimize the primary loop area and add a CBB capacitor for filtering at the DC input.

2. The BPP power supply capacitor must be close to the chip;

3. A greater safety distance is needed between D and S; avoid creating grooves as much as possible.

4. The BPS power supply capacitor needs to be close to the chip;

5. The FB resistor needs to be close to the chip, and the top bias resistor increases RC feedforward;

6. Add a capacitor to ground near the chip where the FWD resistor is located;

7. The bottom of the chip must be covered with a primary or secondary GND layer, ensuring a safety distance, as a shielding layer;

8. Keep the auxiliary power circuit away from the main power circuit and avoid main power magnetic components, such as PFC inductors and main power transformers.

INN3-EP Industrial Auxiliary Power Supply Design Case

This solution, INN3-EP, is a 1250V PowiGaN power supply for industrial welding machines. It can handle applications with large input voltage fluctuations, and can provide a maximum power output of 100W without the need for a heatsink. It is highly integrated, reduces BOM costs, and saves PCB space.

1. InnoSwitch3-EP Product Introduction

2. InnoSwitch3-EP Datasheet

Note 1: PowiGaN™ is a highly integrated GaN technology independently developed by Power Integrations (PI). It is seamlessly integrated with PI's control ICs and FluxLink communication technology to form a complete power system solution, rather than a GaN device sold separately.

Note 2: FluxLink™ is a proprietary magnetically coupled communication technology from Power Integrations (PI ) . It is a solid-insulated, magnetically coupled communication technology that enables bidirectional transmission of feedback and control information over an isolation barrier, achieving complete electrical isolation between the high-voltage and low-voltage sides.