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TPS61230: TPS61230ARNSR does not give 2-2.5A output

Part Number: TPS61230

Hi,

I am charging my batteries from the solar panel, Battery 3x2500mA = 7500mA. (3.7V 18650 Batteries)

My system can draw 5V 1-1.5A and Also operating current is 5V, 300-400mA. So i put a TPS61230ARNSR booster to 5V after batteries.

I made the design by following the design steps, the board is in my hand now, but there is a problem I can not solve.

0.7mA when the load is not connected.

I used the smartphone as a load and saw that I draw a current of 151mA. My phone didn't charge when I took 151mA.

Now I have 2 questions (I can see my output voltage is constant 5V):

1. Why can't I pull 2-2.5A when the load is connected.
2. Why can't the phone charge when you can pull 151mA while the load is connected.

if you want schematic or layout I can throw them too.

Regards,

Mehmet

  • Hi

    it is not the boost converter issue, as the device can provide the 5V as exception.

    to charge a phone, I think signal in the D+ and D- pin is critical. did you try to short these two pins.

  • Hi Jasper,

    To find out if there is a problem with the phone, I've tried something like this:

    -3.4V from the power supply to the booster input, 2.2 ohm resistor as a load connected to the output.

    I measured the output voltage of the booster to 1.45V and measured at 440mA over 2.2 ohms.

    Normally, I think, I should see 5V / 2.2Ohm = 2.27A over 2.2 ohms. 

    How can we solve? I had a mistake in layout when designing another converter before, could it be the problem here?

    Waiting for your support..

    Regards,

    Mehmet

  • Hi Mehmet,

    please remove the 2.2ohm firstly. after the device finish startup, then connect the loading again.

    this device has short circuit protection, which limit the output current when VOUT is lower than VIN.

  • Hi Jasper,

    As you said, 

    Firstly, I connect the device to power supply and then I saw the 5v output of the booster.

    After that I connect the 2.2 ohm as a load, again the output of the booster is 1.5V and current drawn from the source is also around 400mA. 

    and the board sounds a subtle treble.

    Regards,

    Mehmet

  • Hi Mehmet,

    from the power supply display, it seem the input current is limited to 1A.

    if yes, please release it to 5A.

    if not, please capture the VIN and VOUT waveform at the moment adding 2.2ohm

  • Hi Mehmet,

    I assume you had solved the issue. if not, just reply below

  • Hi Jasper,

    Although I was doing the same thing I did before, I got different results.

    I captured on how Vin and Vout waveform behave when I put 2.2ohm into the circuit as you wanted.

    Figure 1

    Figure 1 is the behavior at the time I put it first.

    Figure 2 :

    Also the input current was not limited to 1A but always 3A.

    Although I give 3.4V from the input, you can see that I am falling down to 2.7V and the output is not 5V but 4.42V. In this case, I draw about 2A from the source.

    The input and output voltage continues to decrease as the current drawn from the source increases.

    My last test is like this: 

    input voltge 2.8V

    2.4 A from the source

    output voltage 3.8-3.9V.

    Why not get 5V 2.5A as told.

    Regards,

    Mehmet

  • Hi Mehmet,

    where did you measure the input voltage and output voltage?

    did you measure the data just at input capacitor and output capacitor of the converter? considering the voltage drop on the cable.

    what is the part number of the output capacitor

  • Hi Jasper,

    - Input and output voltages on the oscilloscope screen

    - I measured capacitor at the input and output, showing values like 18uf, normally 22uf in the schematic. Also, C1 is 150 uf at the required values.

    Yes, I measured the nearest input and output to the converter. 

    - Manufacturer Part Number of output Cap: GRM31CR61A226KE19L


    I also share the schematic.

  • Hi,

    please also layout image and also the inductor part number.

    1. did you observe the similar behavior in several boards?

    2. could you measure the performance at IOUT=0, IOUT=100mA, IOUT = 500mA condition. I want to understand at which loading condition, the issue is found (VOUT declines to 4.5V).

    3. please capture the waveform of the VIN, SW pin and VOUT pin. and zoom in to check the detail of each switching duty cycle.

    4. apply an EVM for reference.