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 Number of Outputs Input Voltage Mounting Type Package Type Length Width Depth Weight Efficiency Maximum Temperature
RS Stock No. 192-1245
Mfr. Part No.LPQ252-C
HK$3,366.09
Each
units
±12 V dc, 5 V dc - 6 A, 10 A, 35 A 250W 4 85 → 264 V ac, 120 → 300 V dc Chassis Mount Enclosed 262mm 127mm 76.2mm 1.4kg 75% +50°C
RS Stock No. 289-5046
Mfr. Part No.LPQ154-C
HK$2,308.59
Each
units
±12 V dc, 5 V dc - 2.5 A, 4.5 A, 8 A, 22 A 110W 4 85 → 132 V ac, 170 → 264 V ac, 220 → 300 V dc Chassis Mount Enclosed 216mm 108mm 38.1mm 800g 75% +50°C
RS Stock No. 183-0010
Mfr. Part No.LPT42
HK$393.40
Each
units
±12 V dc, 5 V dc - 2.5 A, 5 A, 700 mA 40W 3 85 → 264 V ac, 120 → 300 V dc Chassis Mount Open Frame 127mm 76.2mm 29mm 230g 70% +50°C
RS Stock No. 455-7853
Mfr. Part No.LPS172-C
HK$1,997.20
Each
units
5 V dc - 35A 110W 1 85 → 264 V ac, 120 → 300 V dc Chassis Mount Enclosed 216mm 108mm 38.1mm 850g 75% +50°C
RS Stock No. 183-0111
Mfr. Part No.LPT62
HK$464.65
Each
units
±12 V dc, 5 V dc - 1 A, 3.5 A, 8 A 60W 3 85 → 264 V ac, 120 → 300 V dc Chassis Mount Open Frame 127mm 76.2mm 42.9mm 340g 70% +50°C
RS Stock No. 243-2083
Mfr. Part No.LPT65
HK$544.18
Each
units
5 V dc, 12 V dc, 24 V dc - 1 A, 2 A, 8 A 60W 3 85 → 264 V ac, 120 → 300 V dc Chassis Mount Open Frame 127mm 76.2mm 42.9mm 340g 70% +50°C
RS Stock No. 629-5787
Mfr. Part No.NLP65-9608GJ
HK$616.39
Each
units
±12 V dc, 5 V dc - 2.5 A, 7.5 A, 650 mA 65W 3 85 → 264V ac Chassis Mount Open Frame 127mm 76.2mm 32mm 283g 72% +70°C
RS Stock No. 629-5620
Mfr. Part No.NFS40-7624J
HK$415.38
Each
units
24 V dc - 1.6A 40W 1 85 → 264 V ac, 120 → 370 V dc Chassis Mount Open Frame 5in 3in 1.2in 280g 70% +70°C
RS Stock No. 183-0098
Mfr. Part No.LPS65
HK$603.41
Each
units
24 V dc - 2.5A 60W 1 85 → 264 V ac, 120 → 300 V dc Chassis Mount Open Frame 127mm 76.2mm 42.9mm 340g 70% +50°C
RS Stock No. 192-1122
Mfr. Part No.LPT25
HK$396.09
Each
units
±15 V dc, 5 V dc - 2 A, 4 A, 700 mA 25W 3 85 → 264 V ac, 120 → 300 V dc Chassis Mount Open Frame 127mm 76.2mm 29mm 230g 70% +50°C
RS Stock No. 183-0004
Mfr. Part No.LPS45
HK$412.57
Each
units
24 V dc - 2.3A 40W 1 85 → 264 V ac, 120 → 300 V dc Chassis Mount Open Frame 127mm 76.2mm 29mm 230g 70% +50°C
RS Stock No. 192-1100
Mfr. Part No.LPT23
HK$372.93
Each
units
±12 V dc, 5 V dc - 5 A, 700 mA 25W 3 85 → 264 V ac, 120 → 300 V dc Chassis Mount Open Frame 127mm 76.2mm 29mm 230g 70% +50°C
RS Stock No. 751-1554
Mfr. Part No.NPS42-M
HK$181.94
Each
units
5 V dc - 11A 40W 1 90 → 264 V ac, 127 → 300 V dc Chassis Mount Open Frame 101.6mm 50.8mm 25.4mm 118g - +50°C
RS Stock No. 192-1267
Mfr. Part No.LPS255-C
HK$2,701.99
Each
units
24 V dc - 10.4A 250W 1 85 → 264 V ac, 120 → 300 V dc Chassis Mount Enclosed 262mm 127mm 76.2mm 1.2kg 75% +50°C
RS Stock No. 629-5579
Mfr. Part No.NFS40-7605J
HK$452.71
Each
units
5.1 V dc - 6A 40W 1 85 → 264 V ac, 120 → 370 V dc Chassis Mount Open Frame 5in 3in 1.2in 280g 70% +70°C
RS Stock No. 192-1043
Mfr. Part No.LPS22
HK$357.38
Each
units
5 V dc - 8A 25W 1 85 → 264 V ac, 120 → 300 V dc Chassis Mount Open Frame 127mm 76.2mm 29mm 230g 70% +50°C
RS Stock No. 183-0054
Mfr. Part No.LPT45
HK$429.14
Each
units
±15 V dc, 5 V dc - 2.5 A, 5 A, 700 mA 40W 3 85 → 264 V ac, 120 → 300 V dc Chassis Mount Open Frame 127mm 76.2mm 29mm 230g 70% +50°C
RS Stock No. 455-7673
Mfr. Part No.LPS45-M
HK$480.70
Each
units
24 V dc - 2.3A 40W 1 85 → 264 V ac, 120 → 300 V dc Chassis Mount Open Frame 127mm 76.2mm 29mm 230g - +50°C
RS Stock No. 289-5175
Mfr. Part No.LPQ252-CEF
HK$3,228.36
Each
units
±12 V dc, 5 V dc - 6 A, 10 A, 35 A 250W 4 85 → 264 V ac, 120 → 300 V dc Rack Mount Enclosed 262mm 127mm 76.2mm 1.4kg 75% +50°C
RS Stock No. 771-8519
Mfr. Part No.LCC250-12U-7PE
HK$1,919.40
Each
units
12 V dc - 20.8A 250W 1 90 → 264V ac Chassis Mount Enclosed 177.6mm 101.4mm 37.6mm - - +85°C