LM2577 5V to 12V DC Converter step up Voltage Regulator

If you are looking a ICs for a DC to DC converter job. I highly recommend of IC-LM1577/LM2577 supply all of the power and control functions for
step-up (boost), flyback, and forward converter switching regulators.

The output voltage typical : Wide input voltage 3.5Vdc to 40Vdc.
Component list
– 2.2k 1/4W resistor
– 0.1uF capacitor
– 0.33uF capacitor
– 680uF 50V electrolytic capacitor
– 1N5822 high speed schottky diode (3A)
– wire coil inductor, 100uH
– “for LM2577-adj IC” 20k multi-turn variable resistor, set to ratio to R2=2k, R1=18k for voltage output of 12Vdc before soldering
Part number:
– LM2577-12 (12Vdc output)
– LM2577-15 (15Vdc output)
– LM2577-ADJ (1.23Vdc to 37Vdc output)

Using a minimum number of external parts, these regulators are price reasonable good value., and made project easily.

Included on the chip is a 3 amp NPN switch and they have protection circuit, consisting of current and
thermal limiting, and undervoltage lockout.

Other detail within a 52 kHz stable-frequency oscillator that
no external components, a soft start mode to reduce running current during start-up, and current mode
control for rejection of input voltage and output load transients.

LM2577 5V to 12V DC Converter step up Voltage Regulator

16 thoughts on “LM2577 5V to 12V DC Converter step up Voltage Regulator”

  1. Im confused about the inductor. Which inductor should i use? I know its the 100uH type but there are lots of variations of inductor.

  2. Where I ccann find 20k multi-turn variable resistor,2k and 8k,
    Is it the same like regular resistors?
    I’m. New to this I wanna build that but I went to radioshack they didn’t have that or the LM2577

  3. If you need more than 1amp up to 5amp, there are a simple module SMR8805 8809 8812 etc, its abput the same size as 78xx, high efficiency and cost only about $3 ready to use,
    elkalan.blogspot.com

  4. Hy, I need to step-up from 3.7 (1LiPO cell) to around 11V to power up an LCD backlight from an old tablet pc and use it on other projects.
    what parts need to be changed or I can use this circuit as it is?

  5. If I would like to change the inductor 100uH for another of 220uH, what would happen? Is there any problem with the circuit?

  6. Hi, Noel
    Thanks for your feedback.
    I’m sorry, this not tested by us.
    But I think, …

    Its frequency and current maybe changed.

    If you tested then can see happen it, please share to us,
    Thaks a lot.

  7. Hi… the output voltage is constant 12v dc or not because i need costant supply of 12 v and the current is in mA or nt for this circuit…pls rep..

  8. Hello,

    I am looking for a circuit to convert 5 VDC to 12 VDC @ 1.6 Amps. All the circuits I’ve found are under 1 amp output. Can you offer assistance?

    Thanks,
    David

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