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

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  Posted by momename - September 18, 2007 at 8:42 am

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