Correct power supply for a 19V 200w DC to DC converter (for ITX motherboard) - Page 1
Forum section: electronics / beginners

author: wepee
author_rank: Newbie
timestamp: June 02, 2020, 11:01:57 am
content: Hi All,Recently, I bought this product:https://www.amazon.com/Mumusuki-LD-200W-Computer-Internal-Components/dp/B07QSVXPHC#HLCXComparisonWidget_feature_divI bought this product for my ITX motherboard.It has 24pin ATX connector + 4pin CPU connector.Here is the product description:Specifications:Module Size: Approx. 155 * 35 * 20 mm / 6.1 * 1.3 * 0.7 inInput Characteristics:Input Voltage Range: 16VDC - 24VDCInput Current Range: 12.0A Max @19VDCInput Surge Current: 12.0AMax @19VDCWork Efficiency: 85% or moreOutput Requirement: Output (Vin=19VDC)Item Output VoltageOutput CurrentMinimum(V) Typical Value(V) Maximum(V) Ripple wave(mV) Standby current Typical value Peak value +3.30V+3.14 +3.30 +3.47 50 0 8.0 10.0 +5.00VSB+4.75 +5.00 +5.25 50 0.1 2 2.5 +5.00V+4.75 +5.00 +5.25 50 0 6.0 10.0 +12.00V+11.40 12.00 +12.6 120 0 6.0 8.0 -12.00V-11.40 -12.00 -12.6 120 0 0.1 0.15 Protection Function:(For +3.3v, +19V, +5.00v and +5.00VSB Power Output)Overvoltage Protection: when the output voltage reaches 1.5 times the rated voltage, the output is closed.Short Circuit Protection: when a short circuit occurs in the output, the output is closed.Environment Description:Working Temperature/Humidity: 0°C to 40°C / 45% - 75%Storage Temperature/Humidity: - 40°C to +70°C / 10% - 90%Atmospheric Pressure: 86Kpa -- 106KpaPackage Included:1 x Power Module1 x 24pin ATX to 12V AUX1 x 4 pin Molex Power Supply1 x SATA Power1 x 4 pin Floppy Drive Power Connection1 x 4 pin Wire1 x DC Input WireQuestion:What is the correct power source- which option below is the best solution thatI need to buy in order to drive this product and turn on my ITX motherboard?Below are my options:a) Meanwell LRS-150-24https://www.meanwell.com/productPdf.aspx?i=420b) Meanwell LRS-200-24https://www.meanwell.com/Upload/PDF/LRS-200/LRS-200-SPEC.PDFc) Huiyuan Fit for 19.5V 10.3A 200W Laptop Slim Power Chargerhttps://www.aliexpress.com/i/4000423720070.htmlYour advice and suggestion will be most appreciated.Thank you.

author: ace1903
author_rank: Regular Contributor
timestamp: June 02, 2020, 11:37:13 am
content: I used to have one small motherboard based PC. Mine was fan less with processor soldered on PCB (AMD C60 i think).Top power consumption was something in range 40-50w.200w is power consumption for entry level gamer PC. Calculate power consumption of the components you have on the motherboard.If you don't have some super duper graphic card, you can use something like 90W power adapter for laptop.Even if you make configuration with powerful processor and graphic card main problem will be cooling not power supply unit.My experience is that ITX format is too much thermal limited that is only useful for kiosk like applications and limited internet surfing.

author: madires
author_rank: Super Contributor
timestamp: June 02, 2020, 02:02:01 pm
content: Meanwell would be a good choice, but instead of the industrial style PSUs I'd recommend something like GSM90A or GSM120A (up to GSM220A) with 20V output based on the power requirements of your mini PC.

author: wepee
author_rank: Newbie
timestamp: June 18, 2020, 08:04:16 am
content: Hi@madires @ace1903Thank you for your reply.I have consulted a online seller and he said that the only way to power up:https://www.amazon.com/Mumusuki-LD-200W-Computer-Internal-Components/dp/B07QSVXPHC#HLCXComparisonWidget_feature_divIs to have a higher power rating than 200w, as it is shown above the link.So I went and bought the Meanwell LRS-200-24 switch power supply.After more than a week, it has been running fine @24/7 operation.My application is used on a pfSense firewall router for home use.The LRS-200-24 has got 24 vand it is able to pump out 8.8APower = 24 v x 8.8 a = 211.2 WattThank you.

author: JoanTheSpark
author_rank: Contributor
timestamp: June 30, 2020, 04:36:19 am
content: Just want to leave that here, in case somebody is looking for a 'datasheet' for that DC-DC converterTotally forgot, this seems the original source of my unit, as far as I can tell (their details had been on the box the dc-dc converter shipped in):https://www.rgeek.com/portfolio-item/rgeek-pico-psu-rg-200wl-24pin-dc-19v-power-supply-module/