Fractal Design NEWTON R3 800 W Review 0

Fractal Design NEWTON R3 800 W Review

Voltage Regulation, Hold-up Time & Inrush Current »

A Look Inside & Component Analysis

Before reading this page, we strongly suggest a look at this article, which will help you understand the internal components of a PSU much better. Our main tool for the disassembly of the PSU is a Thermaltronics TMT-9000S soldering and rework station. It is of extreme quality and is equipped with a matching de-soldering gun. With such equipment in hand, breaking apart every PSU is like a walk in the park!

The OEM of this unit is the same as that of the entire Newton and Tesla range, ATNG. The platform is new, and its primary side utilizes an LLC resonant converter to minimize energy losses, while DC-DC converters with active components generate the rails in the secondary side.

A small PCB right behind the AC receptacle holds several transient filtering components: a CM choke, three X caps, and a pair of Y caps. The transient filter continues on the main PCB with two X caps and a CM choke. We also found a pair of Y caps and an MOV after the bridges—the MOV is usually placed before the bridge rectifiers to also protect them from surges.

The two parallel bridge rectifiers on the APFC/primary heatsink are bolted together. Their model number is U15K80R, and exactly the same ones are used in the R3 1000 W unit.

The APFC converter uses a single fet, and it is hiding behind the APFC choke, so its identity remains a mystery. There are also two CREE C3D06060A boost diodes. Two parallel Chemi-Cons (400 V, 220 µF each or 440 µF combined, KMM series, 105°C) are used as bulk caps, and their combined capacity seems low for the wattage of this PSU. Finally, the PFC controller is a 2PCS01 IC on the solder side of the main PCB.

Two Infineon SPW32N50C3 fets are the main switchers, and an LLC resonant converter allows them to switch with greatly reduced energy losses.

The secondary side utilizes active components for the generation of the +12V rail—six Infineon IPP023N04N fets are used. Ripple filtering on this rail is taken care of by many Teapo and a few Nippon Chemi-Con electrolytic caps. All of these are rated at 105°C. There are also four polymer Enesol caps right next to the DC-DC converters, and another four such caps are installed on the converters.

The minor rails are generated by two DC-DC converters. We found a CAT7523 PWM controller along with two Infineon IPD031N03L G fets on each one.

The supervisor IC can be found on the solder side of the main PCB, and its model number is GR8313. It only provides two protections (OVP and UVP). We, to be frank, didn't expect to see such a low-end supervisor IC in a high-end PSU.

This small PCB hosts the fan controller circuit. It, among others, utilizes an LM393 voltage comparator, and two thermistors, installed on the secondary heatsink, provide temperature information.

ATNG, again for their own reasons, erased the markings on the standby PWM controller—we noticed the same in the R3 1000 W unit and suspect it to be a TNY277 IC.

Thick wires transfer the main rails and provide earth to the modular PCB, and, contrary to the R3 1000 W, some polymer caps are used here to further suppress ripple.

Soldering quality on the main PCB is good, but the type of solder used made our life really difficult since removing some parts off the PCB was a real struggle. Besides, we had to use the powerful Hakko desoldering gun at the same time as a soldering iron to melt the solder.

Although the cooling fan carries Fractal's logo, it is made by another company, most likely Globe Fan. Exactly the same fan is used in the 1000 W Newton model, so we think that its model number is RL4Z B1352512H (12 V, 0.33 A, 106.86 CFM, 1500 RPM, 29.2 dBA). Finally, as you will notice in the photo above, a triangular plastic baffle is used to direct airflow towards the rear of the PSU.
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