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Dc-dc unit, CC light. 2019-02-10T16:33:48+00:00

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  • Ste
    February 10, 2019 at 4:33 pm
    Post count: 0
    #35483 Reply |

    Hi,

    Please excuse my very basic knowledge.

    I am using one of your units (https://www.amazon.com/dp/B07JZ2GQJF/ref=cm_sw_r_cp_awdb_t1_acfyCbD3DCJW5) to power a tablet instead of using the original battery. From a 12v car battery as input, I am regulating the voltage down to 4.3v. The tablet should consume no more than 3A. During the boot phase I see the current draw get up to approx 2A at which point the CC light flashes. I assume the power is cut, and the tablet reboots. What am I doing wrong in my setup? Your unit is rated to 4.5A.  Thanks!

    Drok
    Keymaster
    February 14, 2019 at 9:45 am
    Post count: 2971
    #35510 Reply |

    Hello Ste,

    Thanks for writing in.

    Could you pleaes tell us how large the input current  is and the preset output current ? Is the input power enough?

    Best regards.

    Ste
    February 15, 2019 at 8:54 am
    Post count: 0
    #35519 Reply |

    I tried both from a 3amp continuous power supply, and fused (5amp fuse) off a car battery (70amp).

    I turned the current adjustment screw clockwise, but it tops out at 2amp and just resets to zero and the cc light comes on. The demand is over 2amp.

    Drok
    Keymaster
    February 19, 2019 at 9:19 am
    Post count: 2971
    #35532 Reply |

    Hello Ste,

    To check it more carefully, is it convenient for you to take a video to show how it is?

    And  regarding to current adjustment, we want to said it is not used to regulated actual output current.
    For most of converters, output current can’t be adjusted directly, which is decided by load mainly. The current adjustment here is for limited output current.
    For example, if you set 2A output, the max output will be 2A. When actual output current reach that level, cc light will be on. And it will limit output to 2A.
    Best regards.

    Dave Mitchell
    February 19, 2019 at 11:16 pm
    Post count: 0
    #35542 Reply |

    ASIN: B07JZ2GQJF  I got a DC to DC stepdown adjustable Buck converter.  I used the pot to set the output voltage to 14V to a 12v bank of parallel batteries.  The input is 25.4 v from another battery bank in series.    When I connect the negative lead to the output, the output voltage runs up to 35 and the amps go to 6A, and the red LED lights up.  I have to pull it off.     I saw that if I was using this for charging that I should use a diode.  If this is what’s happening, then can I place it on the negative output side, and what size and type of diode should I use?    I only want about 1 Amp to flow at max.  I’m mainly just keeping a higher voltage on the 12v batteries at all times for a trickle equalization charge.

    Drok
    Keymaster
    February 20, 2019 at 10:05 am
    Post count: 2971
    #35548 Reply |

    Hello Dave Mitchell,

    Would you please tell us how did you set current before connecting battery? Did you set 1 A output current?

    You can use  a diode with three times as much as  charging voltage and two times as much as  charging current.

    Best regards.

     

     

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