This is the DC switching regulator Voltage 5V at current 3A. It is make for digital circuit. The important part of the circuit is LM2673, it is 3A Step-Down Voltage Regulator with Adjustable Current Limit. The LM2673 is Simple and easy to design with using off-the-shelf external components.
The LM2673 series of regulators circuits that main function as a step-down or buck switching regulator, can drive up to 3-A load with excellent line and load regulation. It has High efficiency 90% up, use a low ON-resistance DMOS power switch inside.
The series consists of fixed output voltages of 3.3 V, 5 V, and 12 V and an adjustable output version. Now we use 5V 3A switch power supply using LM2673.
This circuit complete design that a minimum number of external parts. A high fixed frequency oscillator up to 260 kHz allows the use of physically smaller sized components. A family of standard inductors used with the LM2673, are available from several manufacturers to simple the design working.
More features include to reduce the input surge current at power on by adding a soft start timing capacitor to soft turn on this. The LM2673 series will has built-in thermal shutdown and resistor programmable current limit of the power MOSFET so switch to protect the device and load circuit. The output voltage has a ±2% tolerance. The clock frequency is controlled to within a ±11% .
- Efficiency Up to 94%
- Simple and Easy to Design With (Using Off-The-Shelf External parts)
- Resistor Programmable Peak Current Limit Over a Range of 2A to 5 A
What’s more? You can look other power supply circuits: Click Here
Please see circuit diagram and read more source.