5V to 12V Step Up DC-DC Converter

  • Rajkumar Sharma
  • 137013
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  • easy
  • Tested

5V-to-12V-Step-up-converter-500x500

Step up DC-DC converter is based on LM2577-ADJ IC, this project provides 12V output using 5V input, maximum output load 800mA. The LM2577 are monolithic integrated circuits that provide all of the power and control functions for step-up (boost), fly back, and forward converter switching regulators. The device is available in three different output voltage versions: 12V, 15V, and adjustable.

Requiring a minimum number of external components, these regulators are cost effective, and simple to use. Listed in this data sheet are a family of standard inductors and fly back transformers designed to work with these switching regulators. Included on the chip is a 3.0A NPN switch and its associated protection circuitry, consisting of current and thermal limiting, and under voltage lockout. Other features include a 52 kHz fixed-frequency oscillator that requires no external components, a soft start mode to reduce in-rush current during start-up, and current mode control for improved rejection of input voltage and output load transients.

Features

  • Requires Few External Components
  • Input 5V DC
  • Output 12V DC
  • Output Load 800mA
  • Current-mode Operation for Improved Transient Response, Line Regulation, and Current Limit
  • 52 kHz Internal Oscillator
  • Soft-start Function Reduces In-rush Current During Start-up
  • Output Switch Protected by Current Limit, Under-voltage Lockout, and Thermal Shutdown
  • PCB Dimensions: 45.72 x 34.29 mm

Project is based on LM2577-ADJ IC for flexibility to obtain other output voltages by changing value of feedback resistors R2 and R3

Output Voltage Formula V Out=1.23V (1+R2/R3) (Read Data Sheet for more information about Inductor value, Capacitor, Feedback resistors, Output current and voltage)

Schematic

5V-to-12V-Step-up-converter-SCH

How It Works

LM2577 turns its output on and off at a frequency of 52 KHz, and this creates energy in the inductor L1.

When the NPN switch turns on, the inductor current charges up at a rate of vin/L1, storing current in the inductor. When the switch turns off,, the lower end of the inductor flies above Vin, discharging its current through diode into the output capacitor at rate of (Vout-Vin)/L1. Thus energy stored in the

inductor during the switch on time is transferred to the output during the switch off time. The output voltage is controlled by amount of energy transferred which , in turn, is controlled by modulating the peak inductor current. This is done by feeding back portion of the output voltage to the error amp, which amplifies the difference between the feedback voltage and a 1.23V reference. The error amp output voltage is compared to a voltage proportional to the switch current ( ie., inductor current during the switch on time)

The comparator terminates the switch on time when the two voltages are equal, thereby controlling the peak switch current to maintain a constant output voltage.

Parts List

5V-to-12V-Step-up-converter-BOM

Video

LM2577 Datasheet

lm2577

PCB

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mukesh

how go buy this item

Jeffrey Fernandez

is it really working sir? i badly needed one. Thanks 🙂

akashaniksarkernik

What will be the PCB dimensions and diode 1N5822 is not available will Diode 1N5819 will do? Plus SMD Capacitor 330nf 1206 is this ok?

raihan

sir can you kindly show the pictures of LM2577ADJ

asif ali nawaz

why am I getting same voltage at output which I’m applying at input.

naman jain

Sir how to convert 5v in variable voltages using R1 and R2

Sumit

Can i use for 12 volt 10 watt led light to 5 volt power input ???

MCPE player

what happen when the load draw more than 800mA

Roope

Im just asking what voltage size should C3 and C4 be?

WWWL

Dear, where can i find the dimensions of the printboard?
Thanks!

Raj

Hi, Dimension for this PCB 45.72X34.29MM

Antonio José Montaña

SALUDOS DESDE VENEZUELA HERMANO…!!! Una pregunta tienes por casualidad elaborado un proyecto, o pudieras realizarlo, para covertir el voltaje de dos pilas AAA(1,5 Volt. C/U) a 9 Volt. Se trata de poner a funcionar un MicrĂłfono inalámbrico que usa baterĂ­a de 9 Volt con las dos baterĂ­as AAA, ya que en nuestro paĂ­s esta baterĂ­a de 9 Volt es muy dificil de conseguir y al conseguirla es muy costosa…!!! Gracias por su respuesta amigo. DIOS TE BENDIGA Y TE CUIDE CON TU BELLA FAMILIA…!!!

m.a.sadeghi

i wanna use it for laptop cooler fan can it damage the laptop ?

Aneesh

what to do to get 200mA output current

harsh bansal

Can i use it to convert 5v charger output to power an led strip?

harsh bansal

Where can i get the pcb printed

harsh bansal

5m of led strip use 2A i am using only 1.5 so will it work. If it won’t then please tell the solution

harsh bansal

sir will it burn the board?

harsh bansal

Please share the gerber files

harsh bansal

If i want 1A output then what can i do

Vilius

Can you build this project on a breadboard?

Albert

Hello sir, can you tell what kind of inductor you use?
Can you send a dattasheet?

Benson

Sir i really wanna creat this circuit for my storm robot, please tell me “does it really work”.

Benson

Any way I do love your design

Goran Moskov

Hello, can you tell me is the out current the same as input?

Benson

Please sir , can this circuit power a 12 volt DC motor

Benson

6-12 volts sir

Y S Tay

May I know the current drawn at 5V Input when 12V Output is at Max 800mA? Current drawn is 1.9A at 5V Input?

John Mestemaker

Is there a current place to purchase this PCB?

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