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  • TI Thinks Resolved

TPS61202: Blows the inductor (latched internal driver?) under load

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Replies: 14

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Part Number: TPS61202

I'm using the chip in a power bank design with a single Li-pol battery to drive 5V out for phone charging.  It works fine with 20mA LED load (around 5.6V) but smokes the chip and inductor when a phone is connected (high load).  I'm not an experienced power designer.  Did I do something dumb?

"Do or do not, there is no try."  - Yoda

  • In reply to Guy Marsden:

    Hi Guy,

    sorry for the late reply as busy last week.

    do you mean the IC is still damaged after you change to TPS61252?
    may i know the inductor part number? i need to check if the inductor become saturation.
    could you measure the VIN, VOUT and SW waveform when power the blue speaker.

    Best Regards

    Jasper Li
    Boost Converter Solution 

  • In reply to Jasper Li:

    Yes TPS61252DSGR has blown under load

    Inductor is a Wurth 1.5uH 1.7A  47mOhm  part# 744031001 as recommended in the spec sheet

    I cant take power measurements because the chip blows when trying to charge the bluetooth speaker (or any uUSB battery load).

    It's weird that it works fine with a USB load simulator up to .8 Amp.

    Guy

    "Do or do not, there is no try."  - Yoda

  • In reply to Guy Marsden:

    Hi Guy,

    the inductor should be OK.

    what is output current when charge the bluetooth or battery load? I'm thinking if the overload causes the device shutdown, then high voltage at Vout pin as the ringing caused by long cable between the boost and the loading. as the failure of a converter is normally caused by over voltage at VIN, SW or VOUT pin.
    that is why we need the waveform in these pin to observe what happen before the IC damage.

    from the layout, I don't found the ground of the input, only the positive input to the inductor. is it in the bottom layer?

    Best Regards

    Jasper Li
    Boost Converter Solution 

  • In reply to Jasper Li:

    Hi Guy,

    I haven’t heard back from you, I’m assuming you were able to resolve your issue. If not, just post a reply below

    Best Regards

    Jasper Li
    Boost Converter Solution 

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