Introduction

This teardown features the Acer AC650, a 650W 80-plus Bronze-certified fully modular PC PSU. The AC650 utilizes a fully modular cable design, allowing users to select only the necessary cables for their hardware configuration, resulting in a cleaner and more organized build. Internally, the PSU features Active PFC, a forward-converter architecture, and incorporates synchronous rectification alongside DC-DC step-down conversion.

Built for reliability, it utilizes premium primary and solid caps paired with integrated chokes, all assembled via precision SMT processes. Acer backs the unit with a 3-year warranty and a robust safety suite, including OVP, SCP, UVP, and OPP. ChargerLAB dives inside to uncover the engineering and material quality of Acer's latest power solution.

Product Appearance

Teardown of Acer AC650 650W Fully Modular PC PSU-Chargerlab

Acer's 650W fully modular PSU arrives in colorful retail packaging. The box design includes the Acer logo at the top, an 80 PLUS Bronze badge in the center, and clear "FULL MODULAR" branding at the base to highlight its convenient cable management system.

Removing the inner box reveals a cardboard box printed with an illustration of the power supply's exterior design.

The back side of the box is marked with info regarding the cable and connector configuration.

Side sticker indicates the model name (AC650) and specifies the black colorway.

The unboxing reveals the PSU is secured safely in pearl cotton, alongside the included modular cables and power cord.

The included modular cables are connected to the PSU, and the top features a protective grille to prevent foreign objects from entering.

The protective grille features the Acer logo.

The input end features a dedicated power switch and an AC power socket.

The output end is equipped with modular sockets for cable connections.

Branding on the side of the PSU highlights its 80 PLUS Bronze efficiency rating and clearly identifies the AC650 model.

The other side of the PSU features a label containing the product's serial number.

The back of the PSU displays a comprehensive info label.

Model: AC650 Fully Modular Power Supply

Input: 220VAC, 5A, 50Hz.

Output Rails: +5V (10A), +3.3V (10A), +12V (54A), -12V (0.3A), +5VSB (2A).

Combined Output: +3.3V & +5V < 80W.

Rated Power: 650W.

The length of the PSU is about 141mm (5.551 inches).

The width of the PSU is about 151mm (5.945 inches).

The thickness of the PSU is about 86.1mm (3.390 inches).

The weight is about 1542g (54.39 oz).

Teardown

With the external showcase complete, it’s time to tear down the Acer PSU and take a closer look at the internal design and build quality.

To begin, we will remove the securing screws and open the power supply enclosure.

The cooling fan is secured via a plug-in connector.

The PSU is equipped with a 12025-sized cooling fan.

The cooling fan is rated for an operating voltage of 12V.

The PCBA is screw-mounted inside the chassis, isolated by a transparent sheet, and utilizes soldered connections for its wiring.

Two blue Y-caps are soldered to the AC socket.

The X2 safety cap is from the HOWFINE, 1μF.

This is the PCBA module. The top-left corner features the AC input end, which includes the soldered fuse, differential-mode choke, and common-mode choke. Moving to the right, we find the blue Y-caps, rectifier bridge, film filtering cap, PFC boost choke, NTC thermistor, and the high-voltage filter cap. An internal heatsink is provided for the PFC MOSFET, PFC rectifier MOSFET, and the power MOSFET.

The central area houses the standby power transformer, with the main forward transformer located below it. The heatsink on the left side is dedicated to the synchronous rectifier MOSFET, with a filtering choke positioned to its left. Finally, the left side of the PCBA module incorporates the 5V and 3.3V step-down circuits, featuring step-down chips, output chokes, and filtering caps.

High-voltage area of the PCBA back is covered with foam, which prevents insect ingress and subsequent short-circuit failures.

The back of the PCBA is clean of components, with low-voltage high-current traces left as exposed copper and reinforced with solder for better power delivery.

Desoldering and removing the heatsinks.

The side view of the PCBA highlights the primary input end, including the fuse, differential and common-mode chokes, and the X2 safety cap. Additionally, the rectifier bridge and Y-cap are mounted on the left side of the PCB.

The input fuse is from CONQUER, specifically an MST-series time-delay fuse, 6.3A, 250V.

The differential-mode choke is insulated with an external heat-shrink tube.

The common-mode choke is wound using flat copper wire.

The X2 safety cap, 0.22μF.

Another one is also wound using flat copper wire.

The side of the PCBA accommodates the high-voltage filter cap, NTC thermistor, PFC boost choke, film filtering cap, and the rectifier bridge.

The blue Y-cap is from JNC, spec JY222M.

The rectifier bridge, model GBU1010, spec 10A 1000V, in a GBU package.

The film filtering cap, 1μF400V.

The two-in-one controller is from YW, model YW8300. This is an integrated PFC and forward PWM controller that combines an average current PFC controller with a synchronous PWM controller. It features low startup and operating current, fast PFC response, and comprehensive protection mechanisms including soft-start, fault detection, UVLO, over-voltage clamping, peak current limiting, and duty cycle limiting. It is housed in an SOP-16 package.

Here is the info about YW YW8300.

A long-form heatsink is employed to dissipate heat from the power MOSFET, the PFC rectifier MOSFET, and the PFC MOSFET.

The PFC MOSFET is from CYS, model CPF20N60A, NMOS, 650V, in a TO-220F package.

The PFC rectifier MOSFET, marked VT04065, in a TO-220-2 package.

The PFC boost choke is wound using enameled copper wire.

This is the wire-wound resistor utilized for sensing the current of the PFC MOSFET.

The NTC thermistor is from Shiheng Electronics, belonging to the MF72 series with the part number 2.5D15.

The side of the PCBA accommodates a modular PCB, the transformer, and the high-voltage filter cap.

The high-voltage filter cap is from SAMXON, 330μF400V.

The blue Y-cap is from JNC, JY222M.

This is the drive transformer used to drive the power MOSFET.

The power MOSFET is from CYS, model CPF20N50A, NMOS, 500V and 210mΩ, in a TO-220F package.

Another one is the same model.

The transformer features an ERL35 core, with the magnetic core itself secured and insulated using high-temperature wrapping tape.

The blue Y-cap is from JNC, JY222M.

The synchronous rectifier chip is from SYNC, model SP6019. It is a specialized synchronous rectifier controller designed for forward topologies and is housed in an SOP-8 package.

The synchronous rectifier MOSFET is mounted directly onto the heatsink.

There is another one on the back of the heatstink.

The synchronous rectifier MOSFET is from ANHI, model AUP060N08AG, NMOS, 80V and 6mΩ, housed in a TO-220 package.

Another one is the same model.

Another synchronous rectifier MOSFET is from ANHI, model AUP033N08BG, NMOS, 85V and 3.3mΩ, housed in a TO-220 package.

There is a filtering choke and a a filtering cap on the output end.

The filtering choke is constructed using multi-strand enameled wire wound in parallel.

The filtering choke is constructed using enameled wire windings.

The filtering cap is from TOPAZCON, specifically the LF series of low-impedance electrolytic caps, rated at 16V and 3300μF.

The filtering cap, 220μF25V.

The filtering cap, 1000μF16V.

The synchronous step-down chip is from NDP, model NDP23802QB. It features an integrated power MOSFET and is housed in a QFN-20 package.

Another one is the same model.

There are two step-down chokes, both 4.7μH.

The filtering cap, 1000μF10V.

The filtering cap, 270μF16V.

The standby power chip is from EST, model EST.2811DS. It features an integrated 650V power MOSFET and is housed in an SOP-8 package.

The filtering cap dedicated to supplying power to the main control chip is from ZTC.

The filtering cap, 220μF25V.

Another one is the same model.

The filtering cap is from SAMXON, 10μF50V.

The film cap, 472J1000V.

The standby power transformer is insulated with high-temperature wrapping tape.

Rectification for the standby power rail is handled by two SS34 Schottky diodes from JINGDAO. With a 3A/40V rating and in a SMA packaging.

The filtering cap is from SAMXON, 2200μF16V.

The filtering cap, 10μF50V.

This is the filtering cap, 6.8μH.

The filtering cap, 1000μF10V.

The filtering cap, 1μF50V.

This is a D882 transistor.

The power supervisor chip is from YW, model UTC8313. This 3-channel power supervisor monitors the 3.3V, 5V, and 12V output rails. It provides comprehensive protection, including UVP and OVP, while facilitating switch control and fault status signaling, all within an SOP-8 package.

Here is the info about YW UTC8313.

The voltage reference chip is from YW, model UTC431. This is a three-terminal adjustable precision shunt regulator capable of outputting a voltage between 2.5V and 36V. It is characterized by low dynamic output impedance, low noise, and fast turn-on response, all housed in a SOT-23 package.

Here is the info about YW UTC431.

Another one is the same model.

The optocoupler is from EVERLIGHT, model EL817, utilized to facilitate feedback and protection control.

The cooling fan control circuit utilizes two B772 transistors connected in parallel.

To ensure a robust and reliable connection, the output PCB is both soldered and screwed into place. The PCB serves as the mounting base for the module interface and essential solid filtering caps.

The filtering cap, 270μF16V.

Well, those are all components of the Acer AC650 650W Fully Modular PC PSU.

Summary of ChargerLAB

The Acer AC650 PSU features a sleek black finish and a fully modular design, delivering a rated output of 650W to meet the needs of cost-effective PC builds. It utilizes an Active PFC circuit and high-specification primary electrolytic capacitors combined with solid filtering cap. The unit is 80 PLUS Bronze certified and comes with a 3-year warranty.

According to ChargerLAB’s teardown, it utilizes a highly efficient architecture consisting of an Active PFC, two-switch forward topology, synchronous rectification, and DC-DC conversion. It employs the YW YW8300—a 2-in-1 controller integrating CCM PFC and a forward converter—paired with power MOSFETs from CYS.

The secondary synchronous rectifier MOSFETs are sourced from ANHI. System monitoring is handled by the YW UTC8313, which provides OVP and UVP for the 3.3V, 5V, and 12V rails, as well as power switch control. The primary high-voltage cap is provided by SAMXON, complemented by solid filtering cap. The unit includes a temperature-controlled fan and features large-area heatsinks on the power transistors to ensure stable and reliable operation.