Apevia Turbolink ATX-TL450W-BK Power Supply Review

Primary Analysis

On this page we will take an in-depth look at the primary stage of the Apevia Turbolink ATX-TL450W-BK. For a better understanding, please read our Anatomy of Switching Power Supplies tutorial.

Instead of a using a ready-made rectifying bridge, the reviewed unit uses four discrete diodes. This is another evidence that we are dealing with a very low-end power supply. Four 2A05 diodes are used, each one supporting up to 2 A at 55° C. Therefore, this unit would be able to pull up to 230 W from a 115 V power grid; assuming 80% efficiency, the diodes would allow this unit to deliver up to 184 W without burning themselves out. Of course we are only talking about these components and the real limit will depend on all other components from the power supply. Here you can tell that it is simply impossible for this power supply to be a 450 W unit.

Figure 9: Rectifying bridge

The electrolytic capacitors used in the voltage doubler circuit are from a company called Anodia and labeled at 85° C.

The Apevia Turbolink ATX-TL450W-BK uses the obsolete half-bridge configuration, using two  power NPN transistors labeled “D4206,” which we assume to be “2SD4206” parts. Unfortunately we couldn’t find their datasheet.

Figure 10: Switching transistors

The switching transistors are driven by an ATX2005 PWM controller (relabeled to “2005Z,” which is Solytech’s “trademark”), which is physically located in the secondary.

Figure 11: PWM controller

Let’s now take a look at the secondary of this power supply.