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. 833-8154
Mfr. Part No.MAP55-4002
HK$3,884.34
Each
units
5/±12 V dc - 3 A, 6 A, 500 mA 55W 90 132 V ac, 175 264 V ac 4 U Bracket U Bracket 152.4mm 83.1mm 40.6mm - - 550g
RS Stock No. 833-8170
Mfr. Part No.MAP80-4002
HK$6,459.42
Each
units
5/±12 V dc - 1 A, 4 A, 14 A 80W 90 132 V ac, 175 264 V ac 4 U Bracket U Bracket 182.9mm 106.7mm 45.7mm - - 820g
RS Stock No. 833-8148
Mfr. Part No.MAP55-1024
HK$2,984.34
Each
units
24 V dc - 2.5A 55W 90 132 V ac, 175 264 V ac 1 U Bracket U Bracket 152.4mm 83.1mm 40.6mm - - 550g
RS Stock No. 833-7439
Mfr. Part No.MPB125-2012G
HK$1,118.72
Each
units
12 V dc - 10.5 A, 500 mA 125W 90 264V ac 2 Chassis Mount Open Frame 127mm 76.2mm 26.9mm - - 300g
RS Stock No. 833-7436
Mfr. Part No.MPB125-4350G
HK$1,305.08
Each
units
3.3/5/±12 V dc - 5 A, 10 A, 15 A, 500 mA 125W 90 264V ac 4 Chassis Mount Open Frame 127mm 76.2mm 26.9mm - - 300g
RS Stock No. 833-8085
Mfr. Part No.MAP110-4004
HK$3,495.84
Each
units
5/±15/24 V dc - 1 A, 3 A, 12 A 80W 85 264V ac 4 Chassis Mount Open Frame 177.8mm 109.2mm 50mm - - 590g
RS Stock No. 833-7470
Mfr. Part No.PFC250-1024
HK$6,085.39
Each
units
24 V dc - 10.5A 250W 85 264V ac 1 U Bracket U Bracket 215.9mm 120.7mm 50.8mm - - 1.3kg
RS Stock No. 833-8088
Mfr. Part No.MAP110-4000
HK$3,236.83
Each
units
±5/±12 V dc - 1 A, 5 A, 12 A 80W 85 264V ac 4 Chassis Mount Open Frame 177.8mm 109.2mm 50mm - - 590g
RS Stock No. 833-8145
Mfr. Part No.MAP55-1012
HK$2,977.95
Each
units
12 V dc - 5A 55W 90 132 V ac, 175 264 V ac 1 U Bracket U Bracket 152.4mm 83.1mm 40.6mm - - 550g
RS Stock No. 833-7509
Mfr. Part No.PFC375-4200
HK$9,451.61
Each
units
5/12/24 V dc - 1 10 A, 4 A, 10 A 375W 85 264V ac 4 Chassis Mount Enclosed 228.6mm 127mm 63.5mm - - 2kg
RS Stock No. 833-7451
Mfr. Part No.MPU150-4000
HK$4,531.61
Each
units
5/12 V dc - 2 A, 3 A, 8 A, 30 A 150W 85 264V ac 4 U Bracket U Bracket 203.2mm 106.7mm 38.1mm - - 890g
RS Stock No. 833-8104
Mfr. Part No.MAP130-4001
HK$5,049.39
Each
units
5/±12/24 V dc - 1 A, 3.5 A, 20 A 130W 90 132 V ac, 175 264 V ac 4 U Bracket U Bracket 215.9mm 114.3mm 50.8mm - - 1.1kg
RS Stock No. 706-3556
Mfr. Part No.LM1301-9RG
HK$5,639.53
Each
units
12 V dc - 4A 50W 85 264 V ac, 88 372 V dc 1 Chassis Mount Enclosed 168.5mm 111.2mm 38.7mm - - 770g
RS Stock No. 833-8091
Mfr. Part No.MAP130-1024
HK$4,661.11
Each
units
24 V dc - 6.2A 130W 90 132 V ac, 175 264 V ac 1 U Bracket U Bracket 215.9mm 114.3mm 50.8mm - - 1.1kg
RS Stock No. 833-8151
Mfr. Part No.MAP55-4000
HK$2,820.15
Each
units
±5/±12 V dc - 3 A, 6 A, 500 mA 55W 90 132 V ac, 175 264 V ac 4 U Bracket U Bracket 152.4mm 83.1mm 40.6mm - - 550g
RS Stock No. 833-8139
Mfr. Part No.MAP40-3100
HK$1,683.17
Each
units
5/±12 V dc - 2 A, 3 A, 300 mA 40W 90 264V ac 3 Chassis Mount Open Frame 127mm 76.2mm 31.8mm - - 260g
RS Stock No. 751-1260
Mfr. Part No.ABC400-1024G
HK$1,837.45
Each
units
24 V dc - 17A 400W 90 264V ac 1 Chassis Mount Open Frame 127mm 76.2mm 38.1mm - - 500g
RS Stock No. 833-7489
Mfr. Part No.PFC250-1024F
HK$4,089.80
Each
units
24 V dc - 10.5A 250W 85 264V ac 1 U Bracket U Bracket 250.4mm 120.7mm 50.8mm - - 1.3kg
RS Stock No. 833-8101
Mfr. Part No.MAP130-4000
HK$5,049.39
Each
units
±5/±12 V dc - 1 A, 5 A, 20 A 130W 90 132 V ac, 175 264 V ac 4 U Bracket U Bracket 215.9mm 114.3mm 50.8mm - - 1.1kg
New
RS Stock No. 193-0976
Mfr. Part No.LRP2320-9B
HK$8,497.28
Each
units
12 V dc LR 12.5A 300W 90 264 V ac, 125 300 V dc 2 Chassis Mount Enclosed 168mm 140mm 47.2mm - - 1.5kg