Issue with Buck Boost DC-DC Converter : voltage drop under 1 amp. charge

Components & Accessories Power
1

I was working with the Sparkfun Buck Boost DC-DC Converter to get 5V (using the fixed 5V option switch) at the output from an unregulated voltage source providing an input voltage between 8V to 13V, not stable in time.

The converter works fine under a 0.5A load current in 10 Ohms resistor. The issue has occured when I trying to obtain a 1.0A load current with 5 Ohms resistor. The voltage output only reaches 4.0 to 4.4 V, not 5 V.

According to the specification curve displayed (Vout - 5.0V) on the Hook up site of the product (see reference below), It wouldn’t be an issue to get this power level (5V @ 1.0A), without a heatsink.

Any clues about voltage correction under load applicable to the Buck Boost Converter board ?

Thanks in advance for your helps.

https://cdn.sparkfun.com/assets/learn_t … C42MC4wLjA.

2

What delay value are you using? Note the ending https://learn.sparkfun.com/tutorials/bu … and-tricks has this:

Connecting your Load

Depending on the size of the load connected to the output, you may need to wait between when the enable pin is pulled high and the load is connected to the board. The time delay is relatively short (~10ms), but it shouldn’t be a problem if the load is <800mA at 3.3V, or <700mA at 5.0V. If the custom resistor is populated to output a voltage greater than 5V, you should be able to leave the load connected if the load is <650mA.

3

TS-Russell:
What delay value are you using? Note the ending [https://learn.sparkfun.com/tutorials/buck-boost-hookup-guide#buck-boost-tips-and-tricks[DogNeedsBest has this:

Connecting your Load

Depending on the size of the load connected to the output, you may need to wait between when the enable pin is pulled high and the load is connected to the board. The time delay is relatively short (~10ms), but it shouldn’t be a problem if the load is <800mA at 3.3V, or <700mA at 5.0V. If the custom resistor is populated to output a voltage greater than 5V, you should be able to leave the load connected if the load is <650mA.
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Hello, Thanks for your reply this info and the link you provided very very helpful for me and my work.

Best Regard,

Anna5MM](https://www.dogneedsbest.com/)](Buck-Boost Hookup Guide - SparkFun Learn)