This is 5V 3A Switching Regulator circuit by LM2576-5.0 is simple switching power supply 3A step down regulator for power digital circuits.

Sometimes we need to work on the car or travel outside the area. The without wires internet ADSL. When use the Internet was Using 3G aircards and distributed to the Internet via wireless with “mobile wireless router”. It uses the power supply of 5V 2A. Because it is digital circuit which uses a 10 watt high power ever.

When it comes to used in cars. We can uses power from the cigarette lighter of a car.But have the voltage 12 volts, so it must reduced the voltage down to 5 voltsat current is 2 amperes. We have a lot of choices. When before I use the transistor and IC-7805 for this job. However, when considered with caution. To its low performance. have high temperature and large, as the identity of the generally linear ICs. This work, we try to do the switching IC.

IC-LM2576-5.0. (DC to DC step down voltage regulator) It is a very interesting number. It maintains a constant the voltage of approximately 5 volts and current 3A. Compatible with the device easily. On the manufacturer’s manual. I smile with ease. It is very easy to use. as Figure 1. Will see that, there are only four more devices only are C1-100uF , D1-1N5822,L1-100uH, C2-1000uF. The input voltage levels is 7volts to 40volts. My favorite feature is the runs with high frequency. IC is not hot. It can hold a small cooler. And Used continuously for a long time.

In addition we also can change the number of ICs. To change the the voltage was volts output many the level be LM2576-3.3 (3.3Vdc output), LM2576-5.0 (5Vdc output),LM2576-12 (12Vdc output),LM2576-15 (15Vdc output),LM2576-ADJ (1.23Vdc to 37Vdc output) ,

See to circuit for read detail more.