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Adafruit MiniBoost 5V @ 1A - Voltage drop
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Please be positive and constructive with your questions and comments.

Adafruit MiniBoost 5V @ 1A - Voltage drop

by IoTAll on Tue Oct 12, 2021 6:58 am

Hi!

I am playing with the Adafruit MiniBoost 5V @ 1A - TPS61023 (PRODUCT ID: 4654) and I noticed something unexpected.

I am trying to understand how to design DC boost also so I am interested to understand :)

I powered the breakout thanks to a DC power supply (chaging it manually from 3.5 to 4.2V, max current always set to ~4 to 5 amps), and connected the Vout to a variable load (from 100mA up to ~1.2A current to test the behaviour).

When no load or light load, the output voltage is stable to a little above 5V as expected.
I noticed that above a certain current draw from the load starting from below 1A (maybe 500mA or so, not sure), the voltage output of the breakout is decreasing quiet a lot down to 4.2V (not sure of this number, but noticeably lower than 5V).
I am sorry I didnt take note on all the values! I could test it again later.

I am not using professional tools to measure all this, but a "cheap" power supply and variable load.

I thought that up to around 1A at least follwoing the product description, the output voltage would be stable at 5~5.2V but apparently not.

From a general aspect, is this a normal behaviour and why?

Thanks!!

IoTAll
 
Posts: 217
Joined: Wed May 31, 2017 6:34 pm

Re: Adafruit MiniBoost 5V @ 1A - Voltage drop

by IoTAll on Sat Oct 23, 2021 7:38 am

Hi,
I made the same tests but I took pictures this time.
Here they are!
(divided in few posts as I can upload max 3 pictures per post)

No Load ==> Boost Output voltage: 5.05V
No Load.jpg
No Load.jpg (195.49 KiB) Viewed 46 times


Load drawing 0.1A ==> Boost Output voltage: 4.96V
0.1A.jpg
0.1A.jpg (196.52 KiB) Viewed 46 times


Load drawing 0.2A ==> Boost Output voltage: 4.94V
0.2A.jpg
0.2A.jpg (188.52 KiB) Viewed 46 times

IoTAll
 
Posts: 217
Joined: Wed May 31, 2017 6:34 pm

Re: Adafruit MiniBoost 5V @ 1A - Voltage drop

by IoTAll on Sat Oct 23, 2021 7:40 am

Load drawing 0.3A ==> Boost Output voltage: 4.89V
0.3A.jpg
0.3A.jpg (198.5 KiB) Viewed 46 times


Load drawing 0.4A ==> Boost Output voltage: 4.81V
0.4A.jpg
0.4A.jpg (192.49 KiB) Viewed 46 times


Load drawing 0.5A ==> Boost Output voltage: 4.78V
0.5A.jpg
0.5A.jpg (187.53 KiB) Viewed 46 times

IoTAll
 
Posts: 217
Joined: Wed May 31, 2017 6:34 pm

Re: Adafruit MiniBoost 5V @ 1A - Voltage drop

by IoTAll on Sat Oct 23, 2021 7:43 am

Load drawing 0.7A ==> Boost Output voltage: 4.7V
0.7A.jpg
0.7A.jpg (190.83 KiB) Viewed 46 times


Load drawing 0.9A ==> Boost Output voltage: 4.63V
0.9A.jpg
0.9A.jpg (196.14 KiB) Viewed 46 times


Load drawing 1A ==> Boost Output voltage: 4.61V
1A.jpg
1A.jpg (190.88 KiB) Viewed 46 times

IoTAll
 
Posts: 217
Joined: Wed May 31, 2017 6:34 pm

Re: Adafruit MiniBoost 5V @ 1A - Voltage drop

by IoTAll on Sat Oct 23, 2021 7:44 am

Load drawing 1.2A ==> Boost Output voltage: 5.54V
1.2A.jpg
1.2A.jpg (168.96 KiB) Viewed 46 times


I still wonder if this is normal if we see this kind of drop.

Thank you.

IoTAll
 
Posts: 217
Joined: Wed May 31, 2017 6:34 pm

Please be positive and constructive with your questions and comments.