12V to 16V DC/DC Converter with LM2577

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  Posted by admin - September 14, 2007 at 12:54 am

The circuit is a boost step-up regulator based around an LM2577-ADJ voltage regulator chip and a few other discrete components. Resistors R1 and R2 set the regulated output voltage.
A switch inside the voltage regulator closes between pins 4 and 3, causing current to flow through the inductor to ground. When the switch is released a few microseconds later, a back-EMF ‘kick’ is produced by the inductor, resulting in a positive pulse with respect to the input voltage. This pulse charges the output capacitor via the schottky diode, which tends towards an equilibrium voltage.

12v-to-16v-dcdc-converter-with-lm2577

The switch continues to oscillate, the diode preventing the switch from shorting the output capacitor during the ‘on’ phase. The output voltage is monitored via the voltage divider R1/R2, causing the duty cycle of the switch oscillator to be continuously regulated in order to maintain a constant output voltage under varying loads.
The output voltage defined by R1/R2, if you want to take a 12 volt to 15 volt dc booster is easily.

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Note:
You can buy the circuit module that easy to use at amazon.com.


LM2577T-12/NOPB – IC, STEP-UP VOLTAGE REGULATOR


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