High Insulation Gate-Drive Transformer to Control MOSFETs in Automotive DC/DC Power CVs

The new GDAU series offers high insulation >3kV and supports double-transistors control in a reduced SMD package.

Embedded AC/DC and DC/DC converters are a growing technology in the automotive marketplace. For EV and HEV cars that become to be produced at huge volumes, both onboard battery chargers and 14V power supplies are required to ensure the transfer of energy from the 50/60Hz mains when charging to the final equipments used during a drive (ECUs, radio-GPS systems, lightning…). The related power electronics involves not only transformers and filtering chokes built in half- or full-bridge topologies but also semiconductors like IGBTs or MOSFETs that have to be accurately commanded to deliver the expected output voltage while perturbations at the input or load can affect the global performances. The control-loop often requires a good insulation between the primary side connected to the HV DC-bus (typically 350-800V) and the gate of the transistors (10-15V).


PREMO has developed a new high isolated gate-drive transformer for such applications. The GDAU series is highly recommended whenever a low-size insulated SMD transformer is required to control the MOS transistors. This less than 8mm height device guarantees an insulation level of 3kV and a creepage distance greater than 5mm. The use of special insulated wire and special construction lower the parasitic elements to values (the leakage inductance is 2µH max whereas the prim-sec stray capacitance is less than 12pF) fully optimized for a switching frequency in the 90-125kHz range. The GDAU-001 reference provides a 1:1+1 turn-ratio that can command 2 transistors of the same polarity at once. It can withstand 150Vus without any noticeable saturation (15V control at 100kHz for example).


GDAU series shows a magnetizing inductance value of no less than 400µH to prevent the output control voltage from any noticeable droop. The low DC resistance values of the windings ensure its capability to drive currents up to 0.5Arms continuous without overheating.


GDAU series is a SMD technology delivered in Tape&Reel packaging for easy Pick&Place assembling process. Moreover it is fully compliant with most of the RoHS lead-free reflow soldering techniques. This technology is 100% compatible with AOI (Automatic Optical Inspection) system for final assembled PCB control.


GDAU series is a design fully compliant with the automotive AEC-Q200 standard. It has been validated in operation from -40 to +155°C. With only UL94V-0 listed insulating materials and a total weight of less than 5g, this component shows no thermal aging effect on this wide operating temperature range.


PREMO offers samples to test this high reliability solution.


PREMO is a Spain-based company engaged in the development, manufacture and sale of electronic components with special focus on the growing market of H&EV, Smart Metering and market segments including automotive, telecommunications and industrial electronics. Our product portfolio includes NFC & RFID antennas (worldwide leader), power transformers, inductors & chokes, current sensors, EMC filters, PLC components and accessories. In addition to our broad range of standard components, off-the-shelf products, PREMO designs custom solutions to fit customer requirements.


About Us

PREMO is a Spain-based company engaged in the development, manufacture, and sale of electronic components with special focus on the growing market of H&EV, and market segments including automotive, telecommunications, and industrial electronics.


Our product portfolio includes RFID antennas (worldwide leader), power transformers, inductors & chokes, current sensors, EMC filters, and PLC components. In addition to our broad range of standard components, off-the-shelf products, PREMO also designs custom solutions to fit customer requirements, based on the latest technologies to help your systems be more efficient.


800 employees at over 7 design and production locations and an extensive sales network let PREMO have a global presence to meet country specific needs.


54 years being a preferred supplier because of our strong commitment to business excellence, engineering support, reliable delivery and the quality of our products.