Regarding low-power power supplies, I would like to talk about the cost issue and how to reduce costs!

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Regarding low-power power supplies, I would like to talk about the cost issue and how to reduce costs! [Copy link]

Let's take a look at the basic specifications of low-power power supplies and chargers!

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500) {this.resized=true; this.width=500; this.alt='This is a thumbnail, click to enlarge.\nPress and hold CTRL, scroll the mouse wheel to zoom freely';this.style.cursor='hand'}" resized="true"> 1) Energy Star (US)
Standby power < 0.50W
2) California Energy Commission (CEC)
Standby Power < 0.75W
Average efficiency > 64% for Po=5W
3) Blue Angel
Standby Power < 0.3W

500) {this.resized=true; this.width=500; this.alt='This is a thumbnail, click to enlarge. Linear 1) Low cost (< $0.3 PCBA for 5W) 2) Large size & heavy 3)

Single line Input 4) Not meeting Green Mode Switching Mode 1) Higher Cost (> $0.5 PCBA for 5W ) 2 ) Universal line input


3 ) Meet Energy star, blue angel, CEC 4 ) EMI RCC 1) Lowest cost 2) Variable Frequency 3) Inconsistent performance PWM 1 ) $0.1 – $0.2 more than RCC 2) Fixed frequency 3) Consistent green mode & EMI RCC SCH: 500) {this.resized=true; this.width=500; this.alt='This is a thumbnail, click to enlarge. \nPress CTRL and scroll the mouse wheel to zoom freely';this.style.cursor='hand'}" resized="true"> 1) No PWM IC ($0.1 - $0.2) 2) NPN Switch ($0.025) PWM SCH: 500) {this.resized=true; this.width=500; this.alt='This is a thumbnail, click to enlarge. \nPress CTRL and scroll the mouse wheel to zoom freely';this.style.cursor='hand'}" resized="true"> 1) PWM IC + MOSFET ($0.1-0.2 + $0.125) 2) Integrated Switch High Voltage Switch 500) {this.resized=true; this.width=500; this.alt='This is a thumbnail, click to enlarge. \nPress CTRL and scroll the mouse wheel to zoom freely';this.style.cursor='hand'}"> 1) Cost ($0.125 vs 0.025) 2) Efficiency 3) EMI Emitter Switching Topology 500) {this.resized=true; this.width=500; this.alt='This is a thumbnail, click to enlarge.\nPress CTRL and scroll the mouse wheel to zoom freely';this.style.cursor='hand'}" resized="true"> Base Switching 1) Slow turn-off 2) VCEO blocking rating (450V for MJE13003) Emitter Switching 1) Fast turn-off 2) VCBO blocking rating (700V for MJE13003) EST Advantages 1) Fast turn-off time 2) VCBO blocking voltage rating 3) Low High Frequency EMI ? No Y-cap































































500) {this.resized=true; this.width=500; this.alt='This is a thumbnail, click to enlarge. \nPress CTRL and scroll the mouse wheel to zoom freely';this.style.cursor='hand'}" resized="true">From the above, we can see that! Using triodes as switching tubes for low power can reduce the cost by 20% to 40% compared to using MOSFET! The performance is relatively stable and reliable compared to RCC!
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