Corsair CX-M Series 650 W Review - Great Value

Name: Corsair CX-M Series 650 W
Brand: Corsair
Price: 70 USD

crmaris

on Jul 21st, 2022,

in Power Supplies.

Manufacturer: Corsair

Voltage Regulation Stability & Ripple »

Component Analysis

Before reading this page, we strongly suggest looking at this article, which will help you better understand the insides of a PSU.

Corsair CX650M Parts Description
General Data
Manufacturer (OEM)	CWT
PCB Type	single-sided
Primary Side
Transient Filter	4x Y caps, 2x X caps, 2x CM chokes, 1x MOV, 1x CAP200DG (discharge IC)
Bridge Rectifier(s)	1x GBU1506 (600 V, 15 A @ 100°C)
Inrush Current Protection	NTC thermistor (SCK - 2R58) (2.5 ohm)
APFC MOSFETs	2x Champion GP18S50 (500 V, 18 A, Rds (on): 0.19 ohm)
APFC Boost Diode	1x ON Semiconductor FFSP0665A (650 V, 6 A @ 153°C)
Bulk Cap(s)	1x Nippon Chemi-Con (400 V, 330 uF, 2,000 h @ 105°C, KMR)
Main Switchers	2x IPS ITA20N50R (500 V, 12.5 A @ 100°C, Rds (on): 0.3 ohm)
PFC/PWM Combo Controller	Champion CM6800TX & Champion CM03X
Topology	Primary Side: APFC, double-forward Secondary Side: semi-synchronous rectification (12 V) & DC-DC converters (5 V & 3.3 V)
Secondary Side
+12 V	2x Advanced Power AP6N3R5P (60 V, 80 A @ 100°C, Rds (on): 3.58 mOhm) FET 2x PFC PFR30L60CT (60 V, 30 A) SBR
+5 V & +3.3 V	DC-DC Converters: 2x UBIQ QM3054M6 (30 V, 61 A @ 100°C, Rds (on): 4.8 mOhm) 2x UBIQ QN3107M6N (30 V, 70 A @ 100°C, Rds (on): 2.6 mOhm) PWM Controller(s): ANPEC APW7159C
Filtering Capacitors	Electrolytic: 11x Teapo (1–3,000 h @ 105°C, SC) 3x Teapo (4–10,000 h @ 105°C, TA) 1x Teapo (1–5,000 h @ 105°C, SJ) 1x Nippon Chemi-Con (4–10,000 h @ 105°C, KY) 1x Nippon Chemi-Con (1–5,000 h @ 105°CKZE) Polymer: 6x APAQ 2x Elite
Supervisor IC	INI1S429I - DCG
Fan Model	Hong Hua HA1225H12F-Z (120 mm, 12 V, 0.58 A, rifle bearing fan)
5VSB Circuit
Standby PWM Controller	Power Integrations TNY290PG

The CX-M line is based on the CWT CSB-A platform, which uses a combination of old and new circuits. On the primary side is a double-forward topology, which is considered outdated. In contrast, the secondary side has been given a modern touch with DC-DC converters for the generation of the minor rails.

The transient filter is complete.

There is an MOV for protection against power surges. An NTC thermistor handles inrush currents.

Finding a discharge IC in a budget PSU is nice.

The single bridge rectifier can handle up to 15 A.

The APFC converter uses two Champion FETs and a single boost diode. The bulk cap is by Chemi-Con. Its capacity is not high enough to reach a 17 ms hold-up time.

The primary switching FETs are installed into a double-forward topology, which is outdated but more affordable to implement.

The combo APFC and PWM controller is a Champion CM6800TX IC—a blast from the past. A Champion CM03X supports it for the low vampire power needs of today.

The unit's main transformer provides electrical isolation between the primary and secondary sides.

A mix of FETs and SBRs regulate the +12 V rail.

Most filtering caps are provided by Teapo, an often-used brand in budget units. Teapo caps are even found in several more expensive implementations since Teapo is considered a good alternative to Japanese cap manufacturers.