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Aug 11, 2023

IGBT/SiC module gate drivers add temperature readout ...

The SCALE-iFle LT NTC gate drivers target the popular new dual, 100 mm x 140 mm

The SCALE-iFle LT NTC gate drivers target the popular new dual, 100 mm x 140 mm style of IGBT modules, such as the Mitsubishi LV100 and the Infineon XHP 2, as well as silicon carbide (SiC) variants up to 2300 V blocking voltage.

Providing Negative Temperature Coefficient (NTC) data enables accurate thermal management of converter systems. This is particularly important for systems with multiple modules arrayed in parallel, ensuring proper current sharing and dramatically enhancing overall system reliability. Often a thermal guardband is used to avoid one module underperforming. Using the temperature data can identify a failing module for replacement.

The SCALE-iFlex LT gate drivers improve current sharing accuracy and therefore increase the current carrying capability of multiple-paralleled modules by 20 percent, allowing users to significantly increase the semiconductor utilization of their converter stacks.

This is possible because the localized control of each 2SMLT0220D MAG (Module Adapted Gate driver) unit ensures precise control and switching, enabling higher levels of current sharing. Advanced Active Clamping (AAC) is employed to deliver accurate overvoltage protection.

"Designers of renewable energy and rail systems using SCALE-iFlex drivers already benefit from increased system performance; the SCALE-iFlex approach handles paralleling so expertly that one module in five can be eliminated without loss of performance or current de-rating. Adding an isolated NTC output reduces hardware complexity – particularly cables and connectors – and contributes to system observability and overall performance," said Thorsten Schmidt, product marketing manager at Power Integrations at PCIM Europe 2023.

To further increase space saving, up to four MAG-driven power modules can be parallel-connected from a single 2SILT1200T Isolated Master Control (IMC) unit, which can also be mounted on a power module due to its compact outline.

The gate drivers are fully qualified to IEC 61000-4-x (EMI), IEC-60068-2-x (environmental) and IEC-60068-2-x (mechanical) specifications, and undergo complete type testing – low voltage, high voltage, thermal cycling – shortening designer development time by 12 to 18 months. A comprehensive set of protection features is included, and parts are optionally available with conformal coating.

The SCALE-iFlex LT NTC gate drivers are available for sampling now.

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