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TPS43061: TPS43061 as s TPS43060 substitute

Ashraf Wahba
Prodigy 35 points
Part Number: TPS43061
Other Parts Discussed in Thread: TPS43060, , CSD18543Q3A

Hi,

I designed a circuit for the TPS43060 using webench to create a 36V 1A DC supply from a 6 to 8V DC input. The first articles worked fine, but TPS43060 is now out of stock.

When I replaced it with TPS43061, removed the bootstrap diode and replaced the 2Ohm resistor with a 0Ohm resistor, I started having overheating of QL (CSD18543Q3A).

I understand all other parameters (switching freq, compensation circuit) could stay the same.

Thanks,

Ashraf

  • 0
    TI__Expert 7450 points

    Hi Ashraf,

    I'll ask the team about the status of TPS43060. Another difference about TPS43061 is its drive voltage reduces to 5.5V. So the driving loss will reduce but the conduction loss increases and depending on the operating condition is could cause higher loss. Also, it wouldn't hurt to check the SW, VCC, BOOT, and HDRV waveform to make sure the bootstrap is working correctly.

    Thanks,

    Yinsong

  • 0 in reply to Yinsong Cai1
    Prodigy 35 points

    Hi Yinsong,

    Thank you for the reply. I found a cold solder on SW and BOOT. I suspect this have something to do with it. I will try to rework and test again.

    I  think the question is now : If I have a circuit that works with TPS43060, and the FETs are already NexFET and optimized for TPS43061. In principle, I should be able to use TPS43061 if I remove the schottky diode (and shunt the 2Ohm resistor), the same circuit should work. No need to adjust FETs, comp circuit, etc?

    Thanks,

    Ashraf

  • +1 in reply to Ashraf Wahba
    TI__Expert 7450 points

    Hi Ashraf,

    That is correct. The difference of LM43061 is all driver related: VCC voltage, driver resistance and gate rise/fall time, bootstrap diode, and deadtime.

    Thanks,

    Yinsong

  • 0 in reply to Yinsong Cai1
    Prodigy 35 points

    I will just remove the diode, short the 2Ohm resistor and use TPS43061 then.

    Thanks for your help.

    Ashraf