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Examining a gate drive optocoupler

23 Mar 2015  | Avago Technologies

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The distributed power supply
The ACPL-302J device was developed to improve isolated power supplies and simplify gate drive design. The device is optimised for distributed power supply topology (figure 4 and 5). It is a 2.5A rail-to-rail smart gate drive optocoupler with an integrated flyback controller for DC-DC converters. By integrating the flyback controller, the ACPL-302J enables integration of smaller high-efficiency transformers to be placed next to the device (figure 6). As a result, the designer can reduce the overall footprint, minimising electromagnetic interference (EMI) and noise coupling between IGBT channels. With a smaller transformer, the primary winding switching transistor is integrated in the ACPL-302J and smaller capacitors can be used for filtering.


Figure 4: The distributed power supply topology.


Figure 5: ACPL-302J, 2.5A gate drive optocoupler with integrated flyback controller, active miller damp, DESAT and UVLO detection.


Figure 6: The board level view of the distributed power supply topology using ACPL-302J and benefits.


Summary
By integrating the flyback controller, the ACPL-302J device allows fewer discrete components and smaller transformers and capacitors to be placed next to the device, thus reducing the overall footprint of the design and minimising electromagnetic interference (EMI) and noise coupling between IGBT channels. By reducing these elements of the design, there is a notable cost savings the designer can realise.


About the author
Avago Technologies contributed this article.


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