Super Flower Leadex III ARGB Gold 750 W Review

Name: Super Flower Leadex III ARGB Gold 750 W
Brand: Super Flower
Price: 139 USD

crmaris

on Jul 8th, 2020,

in Power Supplies.

Manufacturer: Super Flower

Voltage Regulation Stability & Ripple »

Component Analysis

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Super Flower SF-750F14RG Parts Description
General Data
Manufacturer (OEM)	Super Flower
Platform Model	Leadex III
PCB Type	Single-sided
Primary Side
Transient Filter	3x Y caps, 3x X caps, 2x CM chokes, 1x MOV
Bridge Rectifier(s)	1x
Inrush Current Protection	NTC Thermistor & Relay
APFC MOSFETs	2x Infineon IPA50R199CP (550 V, 11 A @ 100 °C, 0.199 ohm) & 1x SPN5003 FET (for reduced no-load consumption)
APFC Boost Diode	1x STMicroelectronics STTH8R06D (600 V, 8 A @ 130 °C)
Hold Up Cap(s)	2x Nippon Chemi-Con (400 V, 330 uF each or 660 uF combined, 2,000 h @ 105 °C KMR)
Main Switchers	2x Infineon IPA50R140CP (550 V, 15 A @ 100 °C, 0.14 ohm)
APFC Controller	SF29603 & S9602
Switching Controller	SF29605
Topology	Primary side: Half-Bridge & LLC converter Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side
+12 V	4x Infineon IPP041N04N (40 V, 80 A @ 100 °C, 4.1 mOhm)
+5 V & +3.3 V	DC-DC Converters: 8x Alpha & Omega AON6516 (30 V, 25 A @ 100 °C, 8 mOhm @ 125 °C) PWM Controllers: 2x ON Semiconductor NCP1587A
Filtering Capacitors	Electrolytics: 6x Nippon Chemi-Con (105 °C, W), 4x Nippon Chemi-Con (4–10,000 h @ 105 °C, KY), 1x Nippon Chemi-Con (1–2,000 h @ 105 °C, KMG), 2x Nippon Chemi-Con (1–5,000 h @ 105°C, KZE), 7x Nichicon (1,000 h @ 105 °C, RZ), 1x Nichicon (2–5,000 h @ 105 °C, HD) Polymers: 8x FPCAP, 3x United Chemi-Con, 2x Jamicon
Supervisor IC	SF29603 & LM339A
Fan Controller	STMicroelectronics STM8S003F3
Fan Model	Globe Fan S1302412M (130 mm, 12 V, 0.40 A, fluid dynamic bearing fan)
5VSB Circuit
Rectifiers	1x PFC Device PFR20L60CT (60 V, 20 A)
Standby PWM Controller	SF29604

Super Flower's Leadex III platform performs very well and reliably under even harsh operating conditions. The build quality is good, and most of the parts are of high quality. However, it would still be nice to see less Nichicon RZ caps and more Chemi-Con KY caps, which have a much longer lifetime.

The transient filter is complete, so I expect good EMI performance.

An NTC thermistor and relay combo protects against large inrush currents.

I couldn't identify the single bridge rectifier because the heatsink is in the way, and I didn't want to remove the bridge rectifier.

The APFC converter uses two Infineon FETs and one SPN5003 FET for reduced no-load consumption. The SPN5003 most likely cuts the power to the APFC off when the PSU is in standby mode. The boost diode is by STMicroelectronics, and the two bulk caps are by Chemi-Con. It would be nice to see 420 V or, even better, 450 V bulk caps since 400 V is close to the DC bus voltage of around 385 VDC.

Two Infineon FETs arranged in a half-bridge topology act as the main switching FETs.

Four Infineon IPP041N04N FETs regulate the +12 V rail.

Because of their low lifetime, the Nichicon RZ caps are my only complaint here. However, the W and KY caps handle the first ripple-filtering layer, while the RZ caps mentioned above are on the modular PCB, where the workload is low.

The two VRMs use eight Alpha & Omega FETs and two PWM controllers provided by ON Semiconductor.

The clear connectors look nice! I cannot say the same of the RZ caps. Besides them, several FP polymers are also used as a second ripple-filtering layer.