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DC/DC CONVERTER Vout:48V Vin:12-24V Iout:12A

David_77

Hi Team,

the goal of my project is to design a Dc/Dc Converter to supply DC Motor

The DC/DC Converter has this requirements:

Vin:9-32V

Vout: 48V

Iout:12A max

I have tried several IC (Boost Converter,Synchronous) but  I would like your suggestion.

The IC LTC3779 can it be suitable for the application? Naturally, as it is a buck-boost, it would only be used as a boost.

I could buy the eval DC2654A but I don't Know if the suitable demo as the Vin min is 16V (not lower)...

In your opinion it could also be suitable for input lower voltages working on the dissipation of the Mosfet?  I don't know if the inductor could also go into thermal crisis ...

if the thermal problems occurred only on the Mofset a solution I could find (in parallel or heatsink with Thermal Interface)  but my doubt is also on the inductor and perhaps on the capacitors (electrolytic input and output)

Eventually, please reccomended an other IC that may be suitable.

Please let me know as soons as possible.

Thanks.Best Regards.

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  • 0
    •  Analog Employees 
    on Aug 5, 2020 3:31 AM

    Hi 

    I would recommend looking at LTC3784, its demo board DC2061A check some of the requirements which makes it a good starting point in your design 

    https://www.analog.com/en/products/ltc3784.html#product-overview

    Please use LTPowercad VII to identify the components that would need to be changed to achieve the application goals

    Regards,

  • +1 on Aug 5, 2020 11:39 AM in reply to Mikee_Lacson_00

    Hi Mikee,

    I'm working on the Boost to supply a BLDC motor 48V (10A) for several months.

    After studying the various Analog solutions (I bought some evaluations), using LTCAD Power to simulate different circuits with different IC and exchanging some emails with your technical support from the site, I made some samples with LTC3787.

    Unfortunately, the experiences have been negative in terms of about 10A even with heatsink , the temperatures of the Mosfets were too high. I think I have chosen the best Mosfets and to use power Inductor reccomended but without results for high current.

    The design with LTC3787 is ok for Vout:48V , Iout 5A max (it works very well) but for higher currents, the temperature management is very critical. Moreover LTC3787 has Vinmax 40V which is too limiting.

    LTC3784 is very very similar to LTC3787...same architecture.Vin max is 60V but there are no evalution for 48V 10A and after the experience, I am puzzled.

    I bought it  DC2061A in the  demo manual is shown:

    VIN = 6V to 47V,  Vout:48V   IOUT = 0A to 3A   

    Also I use heatsink is impossibile to supply 10A...maybe not even with airflow...infact the board also with important heatinks it heats up a lot already at 5A, Moreover the inductance they would already be at 80 °C.

    Sorry, I don't want to sound presumptuous but in recent months I have had a lot of experience on these boosts

    The only schematic that I found with 48V 10A is DC2456A.

    If it's possbile and you agree ,I can send the schematics,layout,BOM and simulation with LTPOWERCAD of LTC3787 design if you leave me your email.

    Please,let me Know.

    Regards.David

Reply
  • +1 on Aug 5, 2020 11:39 AM in reply to Mikee_Lacson_00

    Hi Mikee,

    I'm working on the Boost to supply a BLDC motor 48V (10A) for several months.

    After studying the various Analog solutions (I bought some evaluations), using LTCAD Power to simulate different circuits with different IC and exchanging some emails with your technical support from the site, I made some samples with LTC3787.

    Unfortunately, the experiences have been negative in terms of about 10A even with heatsink , the temperatures of the Mosfets were too high. I think I have chosen the best Mosfets and to use power Inductor reccomended but without results for high current.

    The design with LTC3787 is ok for Vout:48V , Iout 5A max (it works very well) but for higher currents, the temperature management is very critical. Moreover LTC3787 has Vinmax 40V which is too limiting.

    LTC3784 is very very similar to LTC3787...same architecture.Vin max is 60V but there are no evalution for 48V 10A and after the experience, I am puzzled.

    I bought it  DC2061A in the  demo manual is shown:

    VIN = 6V to 47V,  Vout:48V   IOUT = 0A to 3A   

    Also I use heatsink is impossibile to supply 10A...maybe not even with airflow...infact the board also with important heatinks it heats up a lot already at 5A, Moreover the inductance they would already be at 80 °C.

    Sorry, I don't want to sound presumptuous but in recent months I have had a lot of experience on these boosts

    The only schematic that I found with 48V 10A is DC2456A.

    If it's possbile and you agree ,I can send the schematics,layout,BOM and simulation with LTPOWERCAD of LTC3787 design if you leave me your email.

    Please,let me Know.

    Regards.David

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