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UCC5870-Q1: Insulation Specifications according to VDE 0884-11 are not given in datasheet

ergin
Prodigy 10 points
Part Number: UCC5870-Q1
Other Parts Discussed in Thread: UCC21750, ISO5851, UCC21710, UCC21540

Hello everyone, 

I am building a grid connected system, which consists of a three phase inverter (2 level AFE) and two parallel DC-DC converter (LC-SRC) which all connected to a DC-Link with 1200Vdc. In my case, I will use SiC-MOSFET half bridge power modules from Infineon. And I am trying to find an appropriate gate driver IC, where should have an Isolation voltage above Viowm = 1200Vrms, according to VDE 0884-11, because a blocking voltage of  1200Vrms occurs across the power switches. I found some perfect ICs for my application in ti-website. But the Problem is that they are not available in market. (I searched almost all distributors website.) This ICs are UCC21750, ISO5851, ISO5852-EP, because IC must have at least DESAT and UVLO. But I found another IC which is available in Mouser "UCC5870QDWJQ1", but the problem is the Insulation characteristics according to VDE 0884-11 are not given in its datasheet. And the already defined insulation characteristics of UCC5870 are same as another similar IC "UCC5871", where for UCC5871 the insulation characteristics according to VDE 0884-11 given in its own datasheet. My question is, is there any additional info sheet, where the insulation characteristics according to VDE 0884-11 are given or some proof that both ICs (UCC5870 and UCC5871) have same insulation characteristics. 

best regards 

ergin

  • 0
    TI__Expert 5139 points

    Hello Ergin,

    Thanks for your interest in these parts.

    Unfortunately UCC5870 is not currently certified to VDE 088411, which is this information is not in the datasheet. If you would like, you could wait for UCC5871 to become available, which will be certified, but I am hesitant to recommend the UCC587x family of drivers unless you actually need all the protection feature. These drivers need to be configured over SPI every time they are power cycled. These drivers were designed for traction inverter systems, and while they can work in other applications they may not be the best option. From what you have told us, I think the UCC217xx family would be a better option, but I understand the supply constraints. I would recommend logging into TI.com and using the "Notify Me When Available" Button to get a notification when the parts you want are restocked.

    Please let me know if you have further questions, or, if this answers your question, please let us know by clicking the green button.

    Regards,
    Daniel Norwood

    Applications Engineer

    Isolated Gate Drivers

  • 0 in reply to Daniel Norwood
    Prodigy 10 points

    Hello Daniel, 

    Thank you for your response.

    Can tell me anyhow, when the UCC217xx family ICs are going to be available? Or if I place an order, how long will it take to produce these ICs ? I am asking, because, ti provides the gate driver ICs certified in this voltage range only. 

    For plan B, is that as a possible solution to use digital isolator ICs between gate driver IC and each connection to power module? I am a junior Hardware engineer, thus i do not have that much experience, so I am asking you.

    best regards 

    ergin

  • 0 in reply to ergin
    TI__Expert 5139 points

    Hello Ergin,

    Unfortunately, I don't have information on when these parts will be back in stock. Your best option is to use teh "Notify me when available" feature on all the parts that could fit your need. 

    This link should show you all of our drivers that are in stock and have the isolation rating you need: https://www.ti.com/power-management/gate-drivers/isolated-gate-drivers/products.html?keyMatch=ISOLATED%20GATE%20DRIVER#!p3318=0&p2738=1200;2121

    You might check UCC21710, and UCC21540. Last I checked both of these had some stock and fit the isolation rating you need. Unfortunately, UCC21540 does not have as many protection features as the UCC217xx family. 

    As to using a digital isolator to increase the isolation rating, this is possible but the digital isolator must be between the the controller and the gate driver IC, not between the gate driver and the power module. Another option is to use a digital isolator combined with a non-isolated gate driver. 

    Please let me know if I can help more.

    Regards,

    Daniel