Variable Switching Power Supply 10A L4970A

Sunday, May 6th, 2018 - Power Supply Circuit

The circuit of variable switching power supply 10A L4970A has a variable output voltage of 0 VDC to 25 VDC with the ability to supply maximum current 10 Ampere. The circuit of variable switching power supply 10A L4970A is built with the main component IC L4970A. L4970 IC is an IC chip regulator positive step-down switching voltage regulator with power DMOSFET which has been integrated into the L4970 IC chip. Schematic diagram and list of components to make the circuit of variable switching power supply 10A L4970A can be seen in the following figure.

The circuit of Variable Switching Power Supply 10A L4970A

Variable Switching Power Supply 10A L4970A

Working Principle Of Variable Switching Power Supply 10A L4970A

The circuit of variable switching power supply 10A L4970A above can provide a regulated output voltage that is variable from 0- 25V which can be adjusted by means of determining the position of the lever VR 18 K ohm potentiometer connected to the IC L4970A. In the power supply circuit output switching regulator IC L4970 above are winding 150 UH. UH coil 150 is made using a 1.3 mm wire size email and as much as 45 coils wound on an iron core.

The circuit of variable switching power supply 10A L4970A on the image above circuit using a step-down transformer from 220VAC to 28 VAC. Later the AC voltage of the transformer is converted from the proficiency level DC voltage using a diode bridge and electrolytic capacitors (Elco) 3300UF.

L4970 IC functions as a voltage regulator with a switching system which is equipped with power regulator DMOSFET within the IC. L4970 IC will generate heat during operation, so it needs to be equipped with cooling (heat sink) to absorb the heat generated by the IC L4970 in the circuit of variable switching power supply 10A L4970A.

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