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. 122-7684
Mfr. Part No.ECE60US09
BrandXP Power
HK$563.57
Each
units
9 V dc - 6.67A 60W 85 264 V ac, 120 370 V dc 1 PCB Mount Encapsulated 91.4mm 38.1mm 28mm - - 191g
RS Stock No. 122-7584
Mfr. Part No.ECP130PS12
BrandXP Power
HK$744.84
Each
units
12 V dc - 10.83A 130W 85 264V ac 1 Chassis Mount Open Frame 76.2mm 50.8mm 24.1mm - - 195g
RS Stock No. 122-7095
Mfr. Part No.ECP225PS12-A
BrandXP Power
HK$1,081.07
Each
units
12 V dc - 18.75A 225W 80 264V ac 1 Chassis Mount Open Frame 127mm 76.2mm 22.6mm - - 230g
RS Stock No. 122-7092
Mfr. Part No.ECM60UT33
BrandXP Power
HK$448.39
Each
units
5/±15 V dc - 2.5 A, 8 A, 500 mA 60W 90 264 V ac, 120 370 V dc 3 Chassis Mount Open Frame 101.6mm 50.8mm 27mm - - 150g
RS Stock No. 122-7046
Mfr. Part No.ECM100US12
BrandXP Power
HK$708.86
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. 122-7038
Mfr. Part No.ECM100US03
BrandXP Power
HK$584.93
Each
units
3.3 V dc - 20A 100W 90 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 114.3mm 63.5mm 27mm - - 180g
RS Stock No. 122-7077
Mfr. Part No.ECM60UD21
BrandXP Power
HK$422.75
Each
units
5/12 V dc - 3 A, 8 A 60W 90 264 V ac, 120 370 V dc 2 Chassis Mount Open Frame 101.6mm 50.8mm 27mm - - 150g
RS Stock No. 122-7657
Mfr. Part No.ECE10US12
BrandXP Power
HK$200.87
Each
units
12 V dc - 830mA 10W 85 264 V ac, 120 370 V dc 1 PCB Mount Encapsulated 38.1mm 25.4mm 15.24mm - - 24g
RS Stock No. 122-7116
Mfr. Part No.ECP60UT02
BrandXP Power
HK$415.71
Each
units
5/±15 V dc - 9.1 A/2.6 A/0.3A 60W 85 264V ac 3 Chassis Mount Open Frame 101.6mm 50.8mm 27.9mm - - 155g
RS Stock No. 122-7859
Mfr. Part No.SHP350PS36
BrandXP Power
HK$1,082.15
Each
units
36 V dc - 9.7A 350W 85 264V ac 1 Chassis Mount Open Frame 179.3mm 91.44mm 53.34mm - - 788g
RS Stock No. 122-7647
Mfr. Part No.ECE05US03
BrandXP Power
HK$149.29
Each
units
3.3 V dc - 1.51A 5W 85 264 V ac, 120 370 V dc 1 PCB Mount Encapsulated 25.4mm 25.4mm 15.24mm - - 16g
RS Stock No. 122-7073
Mfr. Part No.ECM40UT31
BrandXP Power
HK$409.93
Each
units
5/±12 V dc - 2 A, 6 A, 500 mA 40W 90 264 V ac, 120 370 V dc 3 Chassis Mount Open Frame 101.6mm 50.8mm 27mm - - 150g
RS Stock No. 122-7119
Mfr. Part No.ECS100US12
BrandXP Power
HK$490.09
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. 122-7648
Mfr. Part No.ECE05US05
BrandXP Power
HK$163.13
Each
units
5 V dc - 1A 5W 85 264 V ac, 120 370 V dc 1 PCB Mount Encapsulated 25.4mm 25.4mm 15.24mm - - 16g
RS Stock No. 122-7685
Mfr. Part No.ECE60US09-S
BrandXP Power
HK$770.26
Each
units
9 V dc - 6.67A 60W 85 264 V ac, 120 370 V dc 1 Chassis Mount Encapsulated 113mm 40mm 28.5mm - - 200g
RS Stock No. 122-7827
Mfr. Part No.HDS800PS12
BrandXP Power
HK$3,232.97
Each
units
12 V dc - 66.7A 800W 90 264 V ac, 127 370 V dc 1 Chassis Mount Enclosed 249mm 127mm 40.9mm - - 1.8kg
RS Stock No. 122-7102
Mfr. Part No.ECP40UD03
BrandXP Power
HK$397.90
Each
units
5/24 V dc - 7.80 A/1.30A 40W 85 264V ac 2 Chassis Mount Open Frame 88.9mm 50.8mm 23.6mm - - 110g
RS Stock No. 122-7030
Mfr. Part No.ECM100UQ43
BrandXP Power
HK$885.02
Each
units
5/±12/24 V dc - 2 A, 10 A, 800 mA 100W 90 264 V ac, 120 370 V dc 4 Chassis Mount Open Frame 114.3mm 63.5mm 27mm - - 180g
RS Stock No. 122-6574
Mfr. Part No.EME05US03
BrandXP Power
HK$172.18
Each
units
3.3 V dc - 1.96A 5W 85 264V ac 1 PCB Mount Encapsulated 38.1mm 25.4mm 15.2mm - - 24g
RS Stock No. 122-7081
Mfr. Part No.ECM60US12
BrandXP Power
HK$397.75
Each
units
12 V dc - 5A 60W 90 264 V ac, 120 370 V dc 1 Chassis Mount Open Frame 101.6mm 50.8mm 27mm - - 150g