Hi, I bought the battery babysitter module and are planning to use it to power a device which will have both 3v3 and 5v power.
Hence, I used 2 types of DC/DC power supply that I got from:https://www.qskj.cc/shop/product/194171 … egory=2661 and another one https://www.qskj.cc/shop/product/194172 … egory=2661
My plan is: to connect the battery babysitter with both the 5v step up converter and 3v3 step down converter in the output pin of battery babysitter.
For the 3v3 regulator, the battery babysitter seemed to work fine. However, when I connect the module to the 5v step up converter, the batterybabysitter is flickering, giving like a switching sound and did not start to work at all.
Is there anything that I can do to make this to work? Maybe are there any resistors or some registers that I need to configure first so that I can make my battery babysitter to work with my DC/DC power supply? If not, do you have any other product recommendations?
Thank you!
My plan is: to connect the battery babysitter with both the 5v step up converter and 3v3 step down converter in the output pin of battery babysitter.
Are you saying that you're wanting to have the battery babysitter to *power* the converters? Or, are the converters powering the babysitters?
For the 3v3 regulator, the battery babysitter seemed to work fine. However, when I connect the module to the 5v step up converter, the batterybabysitter is flickering, giving like a switching sound and did not start to work at all.
Are you able to measure the current being pulled by the 5V Step-Up converter? Possibly also check the voltage being supplied the the Step-Up converter as well.
Hi Brandon,
Yes, so the battery babysitter will be powering the converters. The simple block diagram will be like this:
https://ibb.co/hRMcDKN (if you cannot see: https://ibb.co/hRMcDKN)
For the troubled 5V step up converter, the specification said that the input voltage must be between 3 - 5 Volts which I think is enough from the battery babysitter. The current output of this DC/DC converter is able to reach 3Amps. But I have not placed any large load before, whenever I connect the battery babysitter to the DC/DC converter.
Measurements that I have done was to see the rising time for the DC/DC to reach 5 volts, which can be seen:
https://ibb.co/Rzbcnbr (if you cannot see: https://ibb.co/Rzbcnbr) The time it needed from 0 to 5 volts was about 31 mSecs.
The current that I can see when I use a DC power supply and connect it directly to the DC/DC converter was 0.8 Amperes when it first started and then it just went down again. Unfortunately for me, I do not have any other tools to measure the current when we started it for the first time.
Do you have any suggestions on what should I do? I read in the datasheet that the BQ24075 chip from the battery babysitter can give an output of 5 Amperes as well. If that is the case, what should I do to make it to work? thanks!
Will the babysitter be powered by a battery, USB, or USB/Battery? If a battery is involved then what’s the current ratings? You might not be able to source the current you’re looking for.
I read in the datasheet that the BQ24075 chip from the battery babysitter can give an output of 5 Amperes as well.
While the battery might be able to charge at a maximum of 1.5A, there is no guarantee of what the output can pull. You'll be limited by the battery and/or USB supply, not to mention that the traces and board design is not set up to handle anything more than 1.5A.
It will be powered by a battery, and the battery itself is a 6000 mAh battery, so the current should be okay.
While the battery might be able to charge at a maximum of 1.5A, there is no guarantee of what the output can pull. You’ll be limited by the battery and/or USB supply, not to mention that the traces and board design is not set up to handle anything more than 1.5A.
Ah I see… That is good to know thanks!
However, I finally manage to get the board to work. It seemed that I need to deal with an Inrush current and what I did (for now) is to use a really low resistor (10 Ohm) in series with the battery babysitter before connecting to the boost circuit.
I think it will be better to use an NTC but I guess it works okay for now.
But thanks for the information regarding the battery babysitter! I guess if I am planning to draw more than 1.5A, I must try to design my own PCB to accommodate the large currents.