Here is a 12V 3A Switching Regulator circuit, or Step down DC Converter voltage. Use IC LM2576-12 SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator. Input DC Voltage 40Vmax and 16Vmin 3A.
How this circuit works
When we need to use 12V 3A power supply before we choose a linear circuit. But now some projects we use switching regulator. Why? It is more effective. No heat and no power down. It can drive 3A load with very good load regulation.
The output fixed voltage of 3.3V, 5V, 12V (we use it now), 15V and an adjustable. and use a min external components.So We can substitute the popular three-terminal linear regulators IC-LM350T with the LM2576 series.
- 3.3V, 5V, 12V, 15V fix regulator version
- Adjustable version output voltage range 1.23V to 37V (57V for HV version) ±4% max overline and load conditions
- Full 3A output current
- Input voltage range 40V up to 60V (For HV Version)
- Use only 4 external components
- 52 kHz fixed frequency internal oscillator
- High efficiency
- Thermal shutdown and current limit protection
- Simple high-efficiency step-down (buck) regulator
- Efficient pre-regulator for linear regulators
- On-card switching regulators
- Positive to negative converter (Buck-Boost)
But some time,we cannot make the 12V 3A Switching Regulator circuit, because the LM2576 may be expensive than LM7805 and transistor boost up current and some times you may cannot find easily it.
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Parts will you need
|IC1||LM2576-12||12V 3A SIMPLE SWITCHER 3A Step-Down Voltage Regulator|
|Cout||1000uF 25V||Electrolytic Capacitor|
|D1||1N5822||Schottky Barrier Rectifier, 3.0 A, 40 V|
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