The LM2576 IC is a step-down (buck) switching regulator designed to convert high input voltage to a stable low output voltage. In this tutorial, we will guide you in building a powerful fast charger circuit using the LM2576 IC. This circuit not only acts as a fast charger but can also be used as a power bank.
Components Required
- LM2576 IC
- Two 470uF 16V capacitors
- 220 or 330uH inductor
- 1N5408 diode (or any other 3A diode)
- 510 ohm resistor
- Zero PCB Board
- Heatsink
- Type A 5V USB female port
- 12V battery
Circuit Assembly
1. Capacitor Connection
• Connect the positive pin of the first 470uF capacitor to pin 1 of the LM2576 IC.
• Connect the negative pin of this capacitor to pin 5 of the IC.
2. Pin Connections
• Connect pin 3 and pin 5 of the IC together.
3. Diode Connection
• Connect the cathode (positive side) of the 1N5408 diode to pin 2 of the IC.
• Connect the anode (negative side) of the diode to pin 5 of the IC.
4. Inductor and Resistor
• Connect one end of the inductor to pin 2 of the IC.
• Connect the other end of the inductor to one end of the 510 ohm resistor.
• Connect the other end of the resistor to pin 4 of the IC.
5. Second Capacitor
• Connect the positive pin of the second 470uF capacitor to the other end of the inductor.
• Connect the negative pin of this capacitor to pin 5 of the IC.
6. Heatsink Installation
• Secure the LM2576 IC onto a heatsink to prevent overheating.
With these connections, your fast charger circuit is now ready.
Input Voltage
• Connect the positive pin of the 12V battery to pin 1 of the LM2576 IC.
• Connect the negative pin of the battery to pin 5 of the IC.
Output Voltage
• The positive output voltage (5V) will be available at the positive pin of the second 470uF capacitor.
• The negative output voltage (0V) will be available at the negative pin of the same capacitor.
This setup provides a stable 5V output with a current capacity of up to 3A, making it an efficient 15W fast charger circuit.
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| Circuit Diagram |
Usage as a Power Bank
• Connect a 12V battery to the input as described above.
• The circuit will step down the voltage to 5V, providing a 3A output.
• This output can be used to fast charge your phone or any other USB-powered device.
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