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Isolated and low side gate driver for NMOSFET recommendation

d_zero
Genius 4775 points
Other Parts Discussed in Thread: SN6505B, UCC5390, UCC5310, LMG1020, UCC27611, UCC27517, UCC27511, UCC27511A

Dear *

1) ON or OFF  on high side [isolated gate driver]

can you propose a isolated gate driver that can drive following two mosfets ( BSC600N25NS3 [250V] and BSC12DN20NS3 [200V]) 

An alternative to HT0740 

2) in switching applications  [ low side gate driver]

can you propose a gate driver to drive low side mosfet ( BSC600N25NS3 [250V] or BSC12DN20NS3 [200V])  of buck-boost 

2a) if converter working at 1MHz to 2MHz

2b) if converter working at 150kHz to 650KHz

An alternative to UCC37322D ( we are using UCC37322D at fsw = 200kHz and driving IRFB31N20DPBF mosfet)

Best Regards,
David.

  • 0
    TI__Guru**** 189401 points

    Hi, David,

    For your first question, we don't have a direct replacement to the HT0740. In order to command the output ON in a DC manner, we need some sort of isolated supply to power the driver. I would recommend something like this board:   

    This includes our SN6505B which, when used with a transformer, can provide the isolated supply needed for continuous duty cycle on the high-side. You don't need the current capability of the UCC5390 used in this board, you could replace it with the UCC5310 instead.  Let me know if you have any further questions on this.

    My colleague who supports our low-side drivers will reply on the second half of your post shortly.

  • 0
    TI__Genius 13445 points

    Hello David,

    FOr >1MHz switching frequencies and depending on gate drive voltage from your application, you might consider LMG1020 and or UCC27611.

    As for an alternative for UCC37322D, UCC27511 and/or UCC27517 might be good candidates given the low gate charge FETs driven where you might not need a high source/sink current driver.

    Regards,

    -Mamadou 

  • 0 in reply to Mamadou Diallo
    Genius 4775 points

    Hello Mamadou and Don

    Thank you for the feedback.

    @Mamadou 

    1)Would you also recommend UCC27511A  over 1MHz ? if i look at the DS UCC27511A is has very similar characteristic as UCC27611 but is newer device.

    2)Also the can the UCC27511A be used alternate to , UCC27511 and/or UCC27517 ?

    @Don

    just to confirm Ti doesn't have a isolated or high side gate driver that doesn't need supply at the high side?

    Here is the schematic with HT0740

    The mosfet that uses HT0740 is non fast switching

    we don't need direct replacement for HT0740, we only need a high side driver to turn on 200V NMOS

    Best Regards,

    David.

  • 0 in reply to d_zero
    TI__Guru**** 189401 points

    Hi, David,

    That is correct. We currently do not have a functional equivalent to the HT0740 from TI today. We have to use two chips as the EVM design I sent you demonstrates.

  • 0 in reply to d_zero
    TI__Genius 13445 points

    David, 

    Given the low gate charge, and low gate drive voltage, UCC27511A might work assuming you add gate resistors on OUTx pins of the driver to share the power dissipated from the switching cycles and so long as the junction temperature rise resulting from the gate drive switching losses do not exceed the RθJA specified in the datasheet.  

    Having said, LMG1020 , and UCC27611 will be your best bets specifically if you intend to use very narrow pulse widths.

    Regards,

    -Mamadou