Contents
- 1Introducing the Linkworld LPW1685-70
- 1.1Packaging and accessories
- 2Connectors & cabling
- 2.1Casing & cooling
- 3Input filtering
- 4Primary side
- 4.1+5 V stand-by rail
- 5Secondary side
- 5.1Build quality
- 6Load testing
- 6.1Loading +5 V SB
- 6.2Hold-up time
- 6.3Combined loading
- 6.4Combined loading ripple
- 6.5Crossloading, overloading
- 6.6Crossloading, overloading ripple
- 6.7Fan speed, temperatures and noise
- 7Conclusion and evaluation
- 7.1Thanks
- 7.2Discussion
Introducing the Linkworld LPW1685-70
For maybe the very first time in history, we have an opportunity to review a Linkworld power supply which is at least somewhat up-to date. After all the obsolete and dangerous half-bridge gutless wonders, Linkworld recently started producing the LPW series. It comes with models ranging from 500 W to 700 W. In particular, I have obtained the 700W LPW1685-70 model together with the Azza Taurus 5000B case a while ago. This series makes use of the far superior two-transistor forward topology which also generally achieves much better efficiency. The LPW1685-70 itself is 80 PLUS Bronze certified (@115 V).
You may notice the certification took place a long time ago, in 2008. This series is based upon the old, now discontinued, Andyson AD-Mx00A2-71 platform. It has been suggested that while Andyson discontinued the platform, it restarted the production nevertheless. So most likely Andyson is actually making these units for Linkworld, which is an interesting move as Linkworld usually produced its product in its own factory. And all that for very low price actually. In the meantime when I had the LPW1685-70 around, it found a way to some Polish stores. There it sells for slightly over 200 PLN which equals to under 47 Euros or 1260 CZK. Which means we are very well within low-end! For the price, of course, Linkworld provides just the basic 2-year warranty.
The LPW1685-70 has two +12V rails capable of delivering up to 29 A each, or 53 A (636 W) combined. The stand-by rail provides the usual output of 2.5 A, and the −12 V provides slightly more than usual, 0.4 A. The +3.3 V and +5 V can both supply 20 A or 130 W combined. We can just hope the unit will be able to deliver that within the ATX regulation rules. Frankly, I have some doubts about 20 A from +5 V with very low +12 V output…
Packaging and accessories
Unfortunately I only got the power supply itself without the box, but Linkworld representative was kind enough to send me their images. We can see that the front side of the box does not show much more than the photo of the unit.
On the back side we have some detailed information including power distribution tables. Linkworld claims the units have over-power protection and are designed for continuous operation under temperatures up to 40 °C.
With the unit there should be a manual and power cord in the box.
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