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UCC23513: ucc23513

Amir Naghshineh
Prodigy 10 points
Part Number: UCC23513
Other Parts Discussed in Thread: SN6505B

Hi

I am using the UCC23513 for driving a back-to-back N-Channel common drain MOSFET switch ( Solid-state Relay)(SSR) and I am using this relay to connect the battery power to a load. it works fine with the loads.

The circuit is look like the " TI-Low-Cost AC Solid-State Relay With MOSFETs (Rev. A) , Page 5 (TIDUC87A–September 2016–Revised March 2017)

When I connect the battery charger for charging the battery, at some battery voltages ( especially more than 50 volts ) cause fry the UCC23513.

For example:

If the battery is 30 volt and the charger voltage is 47 Volt the unit working.

If the battery is 30 volt and the charger voltage is 51 Volt ( and up) causes frying the UCC23513the unit working.

We need to use chargers and batteries up to 70V 

My question:

1- is there any maximum voltage for the power Mosfet power supply?

2- is it related to UVLO that is limited to 13 volts? ( As you know when the charger is connected th output driver and ground bot becomes negative :(V-battery) Minus  (V-charger)

3- is there any other driver can use it without this problem.

Thanks

Amir

  • 0
    TI__Guru**** 189399 points

    Hi, Amir,

    Sorry to hear you are having difficulties.

    How are you powering VCC/VEE terminals?

    Figure 5 of the document you referenced doesn't really have any details. Can you post your schematic so I can see exactly how you have everything connected? I suspect there is an issue with the power supply for the output stage of the UCC21513. You'll need an isolated supply there.

    Best regards,

    Don

  • 0 in reply to Don Dapkus
    Prodigy 10 points

    Hi Don

    I already put an Isolated supply for the Gate driver chip (UCC21513) and it did fix some of the problems,

    But Still some questions are there:

    - The Datasheet says (4-A Source, 5-A Sink Peak output current), So what current must provide to this chip by the Isolated power supply?

    Thanks

    Amir

  • 0 in reply to Amir Naghshineh
    TI__Guru**** 189399 points

    Hi, Amir,

    Great!

    You can use section 9.2.2.3 Estimate Gate-Driver Power Loss in the datasheet to calculate the power loss, and then convert that to the current required from your isolated supply.  We have several examples of this architecture using the SN6505B transformer driver (but none with the UCC23513 IC, but they use our other isolated drivers).

    https://www.ti.com/tool/UCC5390SCDEVM-010

    Best regards,

    Don