Highly reliable isolated power supply design with enhanced insulation.

In isolated DC-DC converters and gate driver power supplies, the insulation performance of the transformer is a crucial factor in ensuring isolation between the primary and secondary sides. High insulation performance is particularly required in industrial and medical equipment.

The WE-PPTI Reinforced EP7 HV is an IEC61558-2-16 compliant reinforced isolation push-pull transformer designed for isolated DC-DC converters and gate driver power supplies. It supports 500Vrms reinforced isolation and 1000Vrms basic isolation, making it ideal for applications requiring high levels of isolation.

Contribution to noise reduction through low inter-winding capacitance (Low Cww)

In isolated power supply circuits and gate driver circuits, unwanted noise propagating through the isolation barrier can be a problem. Therefore, the inter-winding capacitance (Cww) of the transformer is one of the characteristics that should be checked during the design phase.

The WE-PPTI Reinforced EP7 HV achieves low inter-winding capacitance (Low Cww) of 1.3pF to 3pF typ. This low Cww design makes it a push-pull transformer optimized for noise suppression in isolated power supply circuits and high-speed switching applications.

High efficiency and low heat generation characteristics confirmed in comparative evaluation

In isolated DC-DC converters and gate driver power supplies, improving conversion efficiency and suppressing heat generation are crucial design elements. Therefore, Würth Electronics uses Texas Instruments' SN6507 EVM to evaluate the WE-PPTI Reinforced EP7 HV (750320962) against comparative products. The evaluation uses a 12V input/15V output model, with measurements performed at 400kHz.

The evaluation results are shown in Figures 1 to 3. The evaluation results show that the WE-PPTI Reinforced EP7 HV (750320962) exhibits suppressed temperature rise, good output voltage regulation characteristics, and high conversion efficiency compared to the comparison product. The manufacturer's documentation reports that it exhibits lower heat generation, higher efficiency, and superior regulation characteristics compared to the comparison product.

Figure 1: Comparison of temperature characteristics

Figure 2: Comparison of output voltage regulation characteristics

Figure 3: Comparison of efficiency characteristics

Based on these evaluation results, WE-PPTI Reinforced EP7 HV is a promising option not only for enhanced insulation performance but also for isolated power supply designs that prioritize high efficiency and reduced heat generation.

Key Features of WE-PPTI Reinforced EP7 HV

The WE-PPTI Reinforced EP7 HV is a compact push-pull transformer featuring a reinforced isolation structure compliant with IEC61558-2-16. It utilizes a surface-mount (SMT) compatible EP7 package and is available in a wide range of 12V and 24V input configurations. With an operating temperature range of -40°C to +125°C, it is suitable for isolated power supply designs in industrial equipment and power conversion devices.

The main specifications are as follows:
• Compliant with IEC61558-2-16
Reinforced isolation: 500Vrms
Basic isolation: 1000Vrms
• Available in 12V input and 24V input models.
• A model with a maximum output of 1300mA is available in the lineup.
Inter-winding capacitance (Cww): 1.3pF to 3pF typ
Operating temperature range: -40°C to +125°C
- Surface mount (SMT) compatible EP7 package

Target application

The WE-PPTI Reinforced EP7 HV, with its enhanced isolation performance and low Cww design, can be used in a variety of applications requiring isolated power supplies. It is particularly well-suited as a push-pull transformer for isolated DC-DC converters, gate driver power supplies, and industrial equipment power supplies.
- Isolated interface power supplies (CAN, RS-485, RS-422, RS-232, SPI, I²C, etc.)
Industrial automation
Medical devices
- Insulated gate driver power supply
AC motor drive
• Solar inverter

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