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. 183-0054
Mfr. Part No.LPT45
$108.83
Each
units
5/±15V dc - 2.5 A, 5 A, 700 mA 40W 120 300 V dc, 85 264 V ac 3 Chassis Mount Open Frame 127mm 76.2mm 29mm - - 230g
RS Stock No. 192-1087
Mfr. Part No.LPT22
$69.35
Each
units
5/±12V dc - 2 A, 4 A, 700 mA 25W 120 300 V dc, 85 264 V ac 3 Chassis Mount Open Frame 127mm 76.2mm 29mm - - 230g
RS Stock No. 183-0098
Mfr. Part No.LPS65
$110.69
Each
units
24V dc - 2.5A 60W 120 300 V dc, 85 264 V ac 1 Chassis Mount Open Frame 127mm 76.2mm 42.9mm - - 340g
RS Stock No. 183-0010
Mfr. Part No.LPT42
$107.83
Each
units
5/±12V dc - 2.5 A, 5 A, 700 mA 40W 120 300 V dc, 85 264 V ac 3 Chassis Mount Open Frame 127mm 76.2mm 29mm - - 230g
RS Stock No. 243-2140
Mfr. Part No.LPT46
$99.65
Each
units
5/12/24V dc - 1.5 A, 5 A, 700 mA 40W 120 300 V dc, 85 264 V ac 3 Chassis Mount Open Frame 127mm 76.2mm 29mm - - 230g
RS Stock No. 289-5175
Mfr. Part No.LPQ252-CEF
$917.81
Each
units
5/±12/±5 25V dc - 6 A, 10 A, 35 A 250W 120 300 V dc, 85 264 V ac 4 Rack Mount Enclosed 262mm 127mm 76.2mm - - 1.4kg
RS Stock No. 182-9981
Mfr. Part No.LPS43
$77.81
Each
units
12V dc - 4.5A 40W 120 300 V dc, 85 264 V ac 1 Chassis Mount Open Frame 127mm 76.2mm 29mm - - 230g
RS Stock No. 192-1122
Mfr. Part No.LPT25
$106.63
Each
units
5/±15V dc - 2 A, 4 A, 700 mA 25W 120 300 V dc, 85 264 V ac 3 Chassis Mount Open Frame 127mm 76.2mm 29mm - - 230g
RS Stock No. 111-6582
Mfr. Part No.LCM1000Q-T
$616.80
Each
units
24V dc - 41.7A 1kW 90 264V ac 1 Chassis Mount Enclosed 276.9mm 132mm 61.7mm - - 2kg
RS Stock No. 629-5614
Mfr. Part No.NFS40-7612J
$85.20
Each
units
12V dc - 3.3A 40W 120 370 V dc, 85 264 V ac 1 Chassis Mount Open Frame 5in 3in 1.2in - - 280g
RS Stock No. 289-5046
Mfr. Part No.LPQ154-C
$520.52
Each
units
5±12/24V dc - 2.5 A, 4.5 A, 8 A, 22 A 110W 170 264 V ac, 220 300 V dc, 85 132 V ac 4 Chassis Mount Enclosed 216mm 108mm 38.1mm - - 800g
RS Stock No. 192-1059
Mfr. Part No.LPS23
$79.13
Each
units
12V dc - 3.3A 25W 120 300 V dc, 85 264 V ac 1 Chassis Mount Open Frame 127mm 76.2mm 29mm - - 230g
RS Stock No. 751-1541
Mfr. Part No.NPS22-M
$30.26
Each
units
5V dc - 8A 25W 127 300 V dc, 90 264 V ac 1 Chassis Mount Open Frame 101.6mm 50.8mm 25.4mm - - 100g
RS Stock No. 192-1245
Mfr. Part No.LPQ252-C
$871.77
Each
units
5/±12/±5 25V dc - 6 A, 10 A, 35 A 250W 120 300 V dc, 85 264 V ac 4 Chassis Mount Enclosed 262mm 127mm 76.2mm - - 1.4kg
RS Stock No. 192-1071
Mfr. Part No.LPS25
$103.11
Each
units
24V dc - 1.8A 25W 120 300 V dc, 85 264 V ac 1 Chassis Mount Open Frame 127mm 76.2mm 29mm - - 230g
RS Stock No. 183-0004
Mfr. Part No.LPS45
$95.07
Each
units
24V dc - 2.3A 40W 120 300 V dc, 85 264 V ac 1 Chassis Mount Open Frame 127mm 76.2mm 29mm - - 230g
RS Stock No. 243-2083
Mfr. Part No.LPT65
$108.95
Each
units
5/12/24V dc - 1 A, 2 A, 8 A 60W 120 300 V dc, 85 264 V ac 3 Chassis Mount Open Frame 127mm 76.2mm 42.9mm - - 340g
RS Stock No. 183-0111
Mfr. Part No.LPT62
$130.66
Each
units
5/±12V dc - 1 A, 3.5 A, 8 A 60W 120 300 V dc, 85 264 V ac 3 Chassis Mount Open Frame 127mm 76.2mm 42.9mm - - 340g
RS Stock No. 122-8364
Mfr. Part No.LCB35Q
$36.39
Each
units
24V dc - 1.5A 36W 125 373 V dc, 88 264 V ac 1 Chassis Mount Enclosed 99.5mm 81.5mm 35.5mm - - 280g
RS Stock No. 629-5721
Mfr. Part No.NLP40-7605J
$97.23
Each
units
5V dc - 8A 40W 120 → 370 V dc, 90 → 264 V ac 1 Chassis Mount Open Frame 107.95mm 63.5mm 29.21mm - - 200g