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SN6507: Internal MOSFETs protected?

ArTzy
Mastermind 19720 points

Part Number: SN6507

Hi Experts,

We'd like to ask device information of the part SN6507:

Since the switches are internal to the part, might assume that there is a snubber network of some kind on those switches.

Can you confirm that those MOSFETs are protected? If not, should I be considering a snubber on the input of the transformer? 

Thank you.

Regards,
Archie A.

  • 0
    TI__Genius 13395 points

    Hi Archie,

    Can you please help with design requirements. 

    Operation outside the Absolute Maximum Ratings may cause permanent device damage, the device needs to operate within Recommended Operating Conditions.

    OCP and TSD are the protection features inbuilt to device. 

    Thanks. 

  • 0 in reply to Shinu.V.Mathew
    TI__Mastermind 19720 points

    Hello Shinu,

    Here is shared info from customer:

    Is there a snubber network of some kind on those switches. Can you confirm that those MOSFETs are protected? If not, should I be considering a snubber on the input of the transformer? 

    The application circuit does not specify that a snubber is needed. Please see the attached for the circuit implementation. If protection is implemented within the SN6507, then there is no need to worry about extra protection of the embedded FETs.

    Thank you.

    73,
    Archie A.

  • 0 in reply to ArTzy
    TI__Genius 13395 points

    Hi Archie,

    Thanks for clarifying requirement.

    There is no snubber internal to device for protection. The snubber needs to be external if the switch node spikes are higher than Abs Max of device. 

    Please make sure the transformer leakage inductance is <2% of primary inductance. Non-optimal or long traces between switch node pins and transformer terminals can create parasitic inductance and such parasitic inductance has the same effect as leakage inductance. Please ensure the switch node ringing/spikes is not going beyond recommended operating conditions.  

    Adding snubbers in switch node can reduce ringing/voltage spikes and help reducing emissions, the same is explained in below application note.

    https://www.ti.com/lit/an/slla566a/slla566a.pdf

    Thanks.