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12V2A Power Adapter (PSR) – A Cost-Effective Choice, a Reliable Partner for Security Surveillance and LED Lighting
Publish: 2026-05-29 20:05:38 Update: 2026-05-30 09:40:44 View: 51
What is PSR (Primary Side Regulation)?
Primary Side Regulation (PSR) omits the optocoupler and TL431, sampling the output voltage via an auxiliary winding to achieve constant voltage and constant current control. Compared to the secondary side regulation (SSR) scheme, it offers simpler circuitry (about 15% fewer components), extremely low standby power consumption (≤0.1W), lower cost, and higher reliability. Keyulong Technology applies mature PSR technology to the 12V2A adapter, making it an ideal choice for steady-state load equipment.
Key Performance Specifications
| Input Voltage | 100-240V AC, 50/60Hz |
| Output Voltage / Current | 12V DC / 2A (24W) |
| Output Ripple | ≤200mVp-p |
| Voltage Accuracy | ±5% |
| Standby Power | ≤0.1W |
| MTBF | ≥50,000 hours |
| Certifications | CCC, CE, UL, FCC, UKCA, RoHS, etc. |
Bulk Purchase Prices (B-end Factory Direct)
| Plug Type | Unit Price (Excl. Tax) | MOQ | Remarks |
|---|---|---|---|
| China | ¥7.5/pc | 3000 pcs | Add ¥0.5/pc for orders below 3000 pcs |
| US | ¥8.0/pc | ||
| EU | ¥8.2/pc |
Why choose the PSR 12V2A power supply?
Starting at ¥7.5/pc (3000 pcs), 10%-15% lower than similar quality products, significantly reducing BOM cost.
≤0.1W, compliant with ERP Lot 7 and DoE VI energy efficiency, easily passing energy-saving certifications.
Eliminates optocoupler/TL431, 8 full inspections + ATE testing, failure rate<0.05%.>
CCC/CE/UL/FCC/UKCA/RoHS, etc., supports China/US/EU/UK plugs, barrier-free export.
Typical Application Scenarios
Bullet camera, dome camera, NVR
LED strips, flexible strips, module lights
Smart lock, router, set-top box
Monitor, printer
Sensor, small PLC
If your device requires extremely high dynamic response (frequent motor start/stop), we recommend Keyulong's secondary side regulation (SSR) 12V2A power supply, which can handle high inrush current for demanding products, with ripple ≤200mV and voltage accuracy ±5%.
Keyulong Technology · Source Factory Direct
15 years of mid-to-high end power adapter expertise, making every watt more valuable
Huizhou 8,000㎡ base
Annual capacity 10M units
18+ years experience team
12% revenue invested in R&D
CCC/CE/UL/PSE/KC
Export to 30+ countries
Shipped within 24 working hours
Custom 15-20 days delivery
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