[FAILED] Dual XL6019 Buck-Boost Converter DD39AJPA Review -WattHour

We test the DD39AJPA Buck Boost converter. See the video to know it is not proper dual power.
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XL6019 Datasheet www.xlsemi.com/...
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[@ThomasJakober]

I see what the problem is. In the XL6019 datasheet on fig. 18 there is a schematic for positive and negative symmetrical output. But the designers oft the board misunderstood the inductors. There should not be three separate inductors, all three coils should be on the same magnetic kernel as a transformer. This is probably the cause that it does not work as a symmetrical positive and negative power source.

[@jj74qformerlyjailbreak3]

Robo_Watt is the smartest man on youtube.

[@cyklop1977]

1. In order to obtain a more stable voltage, it is recommended that the output is greater than 15MA.
2. V- cannot be used alone!!!!!!!!!!!!!!!!!!!!!, or no voltage output.But you can just use V+ .
3. The startup current of the module is 2.5-3 times the operating current.
4. Increasing the 1UF-10UF MLCC capacitor reduces the startup current.

[@WattHour]

I have explained all the limitations. This is not a proper product. just misleading title and fake.

[@mikestormm]

Cyklop1977 did you have personally used this board with success? Let me know
Best for all
Mike

[@derirrevomzombiehof4893]

@@mikestormm _ YES! Always with lower Vout then Vin! Works great!

[@mikestormm]

@@derirrevomzombiehof4893 thanks for the replay

[@ВячеславАлександров-е2ь]

Thank you, good job!!!

[@WattHour]

Glad it was helpful!

[@mjkirk12]

What load are on the outputs? Without output loads, the measurements will not be accurate.

[@Przedzik]

Hello Just come across your video and discovered exactly same problem :(
Are there is any board and the market can give me accurate -5 v from positive supply ? I need add -5v to atc power supply’s looking for solution
Thanks

[@danielchatrie6614]

What's the use of negative voltage watt can that power.

[@WattHour]

Hello you may read this page www.allaboutcircuits.com/technical-articles/can-voltage-be-negative-understanding-negative-voltage/

[@peter0702]

why does adding a heat sink to the ic can reduce the temperature of the inductors?

[@WattHour]

It increases the surface area and as a result more heat is transferred to air.

[@peter0702]

@@WattHour I mean the heat is mainly on the inductor not the ic. I have replaced the inductor with higher current rating ones, the overheating issue is gone

[@enginstud8852]

@@peter0702 He doesn’t know