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TPS61178: Alternatives to TPS61178 Boost Converter

Khoi Ly
Prodigy 240 points
Part Number: TPS61178
Other Parts Discussed in Thread: TPS61288

Tool/software:

Dear TI,

I have used TPS 61178 to generate 12V of my BLDC motor via an electronic speed controller.

Here is the following crude observation I found:

1. With the input voltage of less than 4.15V (Li-ion Battery voltage) and boosted to 12V, it’s almost not possible to drive the BLDC motor even without any load 

2. When I reduced the output voltage to 10V, I can boost the voltage with input voltage down to 3.6V and with the output load less than 10W

3. When the output is loaded, meaning the load increases power draw more than 10W, the boost converter resets itself.

So, if I would like to boost from 3.3V - 4.1 V to a consistent 10 - 12 V with output power upto 20 - 25W, what boost converter do you know I can use? Apparently the TPS61179 requires larger input voltage for high power output.

Separately, when the load current reaches 4A, the input voltage losses can be as big as 0.4V, which really affects the boost capability. Do you have any suggestion in the input and output traces design to handle high load current?

Thank you very much and I look forward to hearing from you,

Khoi Ly

  • 0
    TI__Mastermind 27960 points

    Hi  Ly,

    Since our expert of this device is out of office this week, please expect a late reply here. 

    Regards

    Tao

  • +1
    TI__Genius 14385 points

    Hi Khoi,

    Sorry for reply late.

    the device TPS61178 is capable of output 20W @ 3.3V input.

    Please check below points:

    1, the current limit pin: this pin is used to program the switching peak current limit.

    2, the input voltage. When adding load, the input voltage drops due to voltage drop on the input wires.

    Please use a thick and short wire to decrease voltage drop.

    When you see the boost resets, usually it means the input has drop to its undervoltage point, 2.2V.

    3, when the output comes to 4A, the output power comes to 4*10=40W and input is about 40/0.9/4=11.1A.

    it is beyond the device's capacity.

    You could try to use TPS61288, which has a max current limit of 15A and higher efficiency.

    4, It is recommended to use our Evaluation Board to have a test, and this can eliminate problems about external parameters.

    TPS61178EVM Evaluation Board

    TPS61288EVM-064 Evaluation Module User's Guide (Rev. A)

    Please connect me if you have more questions.

    Best Regards,

    Fergus