Embedded Switch Mode Power Supplies (SMPS)

A switch mode power supply is a type of electronic circuit used to convert power. They are also known as switching-mode power supplies or SMPS for short. The typical topology of an SMPS is AC to DC conversion, although users may find other switches that feature an output of DC to DC voltage.

How do SMPS work?

For the power supply to transform its input voltage into an output voltage, the switch will turn on and off with high frequency. The inductors or capacitors within the device will then regulate the power to the device. This continuous switching of the capacitor maintains the voltage at the desired level and provides excellent efficiency.

How do SMPS convert AC to DC?

In the case of AC mains usage, the input voltage will be filtered the same way with a capacitor or inductor to regulate the power and give you the DC output.

Which SMPS is best for a desktop PC?

The power supply unit you use in your PC is important as it ultimately determines what other components you can use within it and the output in performance you get at the end. For high-end gaming PC builds you should aim for an efficiency rating of >80%. The higher the rating, the less electricity it consumes. The less electricity used means easier heat dissipation which keeps the PC cool and performing optimally.

Switching power supply units with higher efficiency and lower levels of heat dissipation are typically compact in nature, making them ideal for projects with limited space.

Where are SMPS used?

  • PC/Laptops
  • Mobile phone chargers
  • Security systems such as CCTV Cameras
  • Machine tool industries

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Description Price Output Voltage Series Output Current Power Rating Input Voltage Number of Outputs Mounting Type Package Type Length Width Depth Ripple And Noise Load Regulation Weight
RS stock no. 122-7874
Mfr. Part No.VCS50US15
BrandXP Power
R 285.70
Each
units
15 V dc - 3.3A 50W 85 264 V ac, 127 370 V dc 1 Chassis Mount Enclosed 110.5mm 78mm 35mm - - 250g
RS stock no. 122-7046
Mfr. Part No.ECM100US12
BrandXP Power
R 1,308.14
Each
units
12 V dc - 8.3A 100W 90 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 114.3mm 63.5mm 27mm - - 180g
RS stock no. 122-7120
Mfr. Part No.ECS100US15
BrandXP Power
R 989.88
Each
units
15 V dc - 6.7A 100W 80 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 101.6mm 50.8mm 28.3mm - - 175g
RS stock no. 122-7071
Mfr. Part No.ECM40US33
BrandXP Power
R 513.10
Each
units
33 V dc - 1.2A 40W 90 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 101.6mm 50.8mm 27mm - - 150g
RS stock no. 122-7167
Mfr. Part No.GCS250PS28
BrandXP Power
R 1,621.11
Each
units
28 V dc - 8.9A 250W 85 264V ac 1 Chassis Mount Open Frame 127mm 76.2mm 36.3mm - - 290g
RS stock no. 122-7048
Mfr. Part No.ECM100US15
BrandXP Power
R 1,237.94
Each
units
15 V dc - 6.6A 100W 90 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 114.3mm 63.5mm 27mm - - 180g
RS stock no. 122-7065
Mfr. Part No.ECM40US07
BrandXP Power
R 522.68
Each
units
7 V dc - 5.7A 40W 90 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 101.6mm 50.8mm 27mm - - 150g
RS stock no. 122-7868
Mfr. Part No.VCS100US12
BrandXP Power
R 646.32
Each
units
12 V dc - 8.33A 100W 85 264 V ac, 127 370 V dc 1 Chassis Mount Enclosed 159mm 98.2mm 42mm - - 500g
RS stock no. 122-7085
Mfr. Part No.ECM60US24
BrandXP Power
R 692.56
Each
units
24 V dc - 2.5A 60W 90 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 101.6mm 50.8mm 27mm - - 150g
RS stock no. 122-7581
Mfr. Part No.VFT80US12
BrandXP Power
R 427.74
Each
units
12 V dc - 6.67A 80W 85 264V ac 1 Chassis Mount Open Frame 101.6mm 47.62mm 25mm - - 130g
RS stock no. 122-7119
Mfr. Part No.ECS100US12
BrandXP Power
R 845.08
Each
units
12 V dc - 8.3A 100W 80 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 101.6mm 50.8mm 28.3mm - - 175g
RS stock no. 122-7063
Mfr. Part No.ECM40UD21
BrandXP Power
R 786.21
Each
units
5/12 V dc - 2 A, 6 A 40W 90 264 V ac, 120 370 V dc 2 Chassis Mount Open Frame 101.6mm 50.8mm 27mm - - 150g
RS stock no. 122-7069
Mfr. Part No.ECM40US18
BrandXP Power
R 522.68
Each
units
18 V dc - 2.2A 40W 90 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 101.6mm 50.8mm 27mm - - 150g
RS stock no. 122-7146
Mfr. Part No.ECS65US12
BrandXP Power
R 549.15
Each
units
12 V dc - 5.4A 65W 80 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 101.6mm 50.8mm 23.2mm - - 175g
RS stock no. 122-7125
Mfr. Part No.ECS130US12
BrandXP Power
R 1,046.45
Each
units
12 V dc - 10.9A 130W 80 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 101.6mm 50.8mm 28.7mm - - 175g
RS stock no. 122-7571
Mfr. Part No.VCP24US24
BrandXP Power
R 339.94
Each
units
24 V dc - 1A 24W 90 264V ac 1 PCB Mount Open Frame 73.8mm 41.6mm 21mm - - 75g
RS stock no. 122-7810
Mfr. Part No.FCM400PS15
BrandXP Power
R 3,859.10
Each
units
15 V dc - 26.6A 400W 80 275V ac 1 Chassis Mount Enclosed 152.4mm 101.6mm 49mm - - 800g
RS stock no. 122-7864
Mfr. Part No.SHP650PS28-EF
BrandXP Power
R 3,644.20
Each
units
28 V dc - 23A 655W 80 264V ac 1 Chassis Mount Enclosed 233.2mm 101.6mm 63.5mm - - 1.3kg
RS stock no. 122-7710
Mfr. Part No.ECL10US03-T
BrandXP Power
R 331.28
Each
units
3.3 V dc - 2.6A 8.6W 85 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 65mm 25.4mm 18.5mm - - 26g
RS stock no. 122-7596
Mfr. Part No.ECP180PS12
BrandXP Power
R 1,446.35
Each
units
12 V dc - 15A 180W 85 264V ac 1 Chassis Mount Open Frame 101.6mm 50.8mm 22.9mm - - 230g