9V to 48V DC-DC Converter

  • Konstantin Dimitrov
  • k_dimitrov@abv.bg
  • 41247
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  • moderate
  • Non tested

photo_1

 

This project is a 8-12Vdc to +48Vdc DC-DC converter based on MC34063 switching regulator.

Description

It’s a simple project of a DC-DC converter to make a phantom power supply for professional microphones. It can deliver 15-20mA at 48VDC. It ‘s based on MC34063 DC-DC step-up, step-down and boost converter. Input is between 8-12V DC and the output +48VDC/10-20mA.

Schematic

Schematic

Photos

3D_PCB

3D PCB renderings

photo_2

MC34063 Datasheet

MC34063A-D

PCB

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Ebrahim Saber

thank you a lott
best regards

Konstantin Dimitrov

Thank you for all people that like my first project

Casper

Nice work, but you forgot to save gnd polygon

Shadi abusalim

I need boost converter 12 to 80 dc
By ic.mosfet.coil

Shadi abusalim

I use uc38 not by transformer

HLSNL

Thanks for project.

Can i use BAT43 instead of BAT49 ?

Sumitava

What is L1 and L2? Is it coil?

Andrea Antonio Gallo

Is it possible to have a ready base?

Joseph Golden

I chucked this on a bread board, and it provided 15VDC from 9VDC supply. Anybody else build it out?

Joseph Golden

Scratch that. Works famously when you hook it up correctly!
Thanks

Tiago SiqueiraxD

Where is the microphone input and output, I only see power input and output,
could anyone help me with this project?

Isaac

What inductor did you use? I am getting an overheating issue.

Xavier Gazon

Hello,

I reproduced the schematic and try with +12V and I only have 30 V instead of 48V. Do you have an idea about the problem. Which component define the output voltage value ? Thank you

Benedek Rácz

I think the L1 should be 300uH instead of the 68uH.

My calculations:

**Conditions:**
V_out: 48V
V_in: 8 … 12V
V_f: 0.6V
V_sat: 0.5V
f: 100kHz
I_out: 14.7mA

**Results:**
t_on/t_off: 5.8
t_on+t_off: 10us (f = 100kHz)
t_off: 1.47us
t_on: 8.53us
C_t: 341 pF
L_min 299uH <—- 5 times greater than in the schematic
I_peak_sw: 200 … 314 mA
Rsc: 1.05 ohm
0.22Rsc: 0.23 ohm

Am I right?

Benedek Rácz

Note, that you are above the MC34063A IC absolute maximum ratings… The datasheet says that no pin accepts voltage above 40V !!!

Hav

Howto increase the output curent to 2A at 48V ?

Ezequiel Segui

Thanks a lot! For a condenser mic, do you know how much time does the battery last?

Vernon Tritchka

Need to make or buy a 9v dc to 40-80v dc unit, small and inexpensive. The one I see here recommended? Or something else? Will only pull power occationally, must take rain and freezing weather. Standing by.

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