Internal structure, fan and components
The circuit board of the Vero L6 shows a typical but cleanly structured design for this performance class, which reflects the pragmatic character of the underlying Jiumeng platform well. The input filtering is fully populated and includes both X and Y capacitors as well as several inductors, which is by no means a matter of course for a budget-oriented power supply unit and contributes to compliance with the EMC limits. The large APFC transformer is sufficiently dimensioned and is thermally supported by a combination of aluminum heat sinks and a compact arrangement of the MOSFETs. The use of a Teapo primary capacitor corresponds to the usual standard in this price region and enables stable PFC control as long as the device is not operated permanently in the thermal limit range.
The secondary side relies on synchronous rectification for the 12 V rail, flanked by DC-DC converters for 5 V and 3.3 V. This architecture ensures proper voltage stability and keeps the ripple values at a level that does not cause any problems in everyday use. The placement of the secondary capacitors with typical Taiwanese low-ESR series is functional, but not optimized for maximum service life, which is to be expected for a power supply in this price range. The structured placement of the components, which enables good airflow despite the compact design, is a positive feature.
The fan used bears an Endorfy label and belongs to the Stratus series, which the manufacturer uses in various of its own products. The Stratus 10-1111 offers a maximum speed of 1800 rpm and uses Fluid Dynamic Bearing, which enables a longer service life and smoother operating noise compared to simple plain bearings. Its quiet running contributes to the fact that the power supply unit remains pleasantly unobtrusive in the lower to medium load range.
The transparent plastic film used as a windshield in the fan area is striking. This small, specifically placed guide surface serves to direct the airflow by preventing part of the airflow from swirling directly past the fan frame back upwards. Instead, the air is directed through the interior and hits the heat-intensive areas of the primary and secondary sides more reliably. This measure improves the cooling performance, particularly at low fan speeds, and contributes to a more even temperature distribution on the circuit board. For a power supply unit in this price range, such a detail is remarkable, as it shows that Endorfy has invested in optimizing the airflow, at least selectively.
| Components and details |
|
| PCB type | Double-sided |
| Transient filter | 4x Y caps, 2x X caps, 2x CM chokes, 1x MOV |
| Inrush protection | NTC Thermistor MF72 3D-20 (3 Ohm @ 25°C) |
| Bridge Rectifier |
GBU1506 (600V, 3.2A @ 100°C) without heat sink
|
| APFC MOSFETs |
Way-On WML28N55C4 (550V, 28A @ 25°C, Rds(on): 0.125Ohm)
|
| APFC Boost Diode |
SI-Trend SI8U600F (600V, 8A @ 100°C)
|
| Bulk Cap(s) |
Teapo (400V, 470uF, 2000h @ 105°C, TD(M))
|
| Main Switchers |
2x Way-On WML28N55C4 (550V, 28A @ 25°C, Rds(on): 0.125Ohm)
|
|
PFC/PWM Combo Controller |
Champion CM6800UBX |
| Topology |
Primary side: APFC, Double Forward
Secondary side: [12V] Synchronous Rectification & [Minor Rails] DC-DC converters |
| Secondary Side | |
| 12V MOSFETs | 4x Way-On WMK025N06HG2 (60V, 106A @ 100°C, Rds(on): 3.2mOhm) |
| 5V & 3.3V | DC-DC Converters: 4x Rectron Semiconductor RMN3N5R0DF (30V, 19.7A @ 100°C, Rds(on): 5mOhm) PWM Controller(s): ANPEC APW7159C |
| Filtering Capacitors |
Electrolytic: |
| Supervisor IC | GRENERGY GR8329E (OVP, UVP, OCP) |
| Fan Model | Stratus 10-1111 (120mm, 12V, 0.25A, Fluid Dynamic Bearing Fan) |
| 5VSB Circuit | |
| Rectifier |
PingWei PS860L (60V, 8A)
|
| Standby PWM Controller |
Chipown PN8141
|
Protection circuits
The protection circuits of the Endorfy Vero L6 750 Watt form an essential basis for the safe operation of the power supply, especially because this platform is technically designed for a budget-oriented market segment and therefore relies on uncompromising robustness in the core functions. The values measured by Cybenetics show that the implementation of the protection mechanisms is solid and that the basic expectations are met in all safety-relevant areas.
The overcurrent protection circuit (OCP) works on all main rails and intervenes at normal operating temperature with a clear overdimensioning. On the 12-volt rail, the OCP threshold is 84 amps, which corresponds to around 134 percent of the rated power. This behavior is quite common with inexpensive power supply units, as it allows a certain tolerance for load peaks that can occur with modern graphics cards. At the same time, the voltage remains stable enough during the overshoot to ensure a controlled shutdown. On the 5 volt and 3.3 volt auxiliary lines, the switch-off points are also above the rated currents, but in a range that ensures safe behavior in the event of incorrect loads without switching off unnecessarily early. The OCP characteristics remain stable even at elevated temperatures. The measured hot values show only minor deviations, which indicates that the protection logic is thermally insensitive and is reliably active even under unfavorable environmental conditions. The 5VSB rail is particularly positive, as its switch-off point is also well within the usual range and therefore handles short-circuit and overload scenarios effectively.
At 1116.93 watts at normal test temperature, the overload protection circuit (OPP) has a relatively high switch-off point of just under 149 percent of the rated power. This generous reserve ensures that short-term load peaks do not immediately lead to shutdown as long as thermal limits are not exceeded. Under the influence of heat, the OPP point drops to around 950 watts, which corresponds to 126 percent and realistically reflects the thermal load capacity of the power supply unit. This behavior is consistent and shows that the protection circuit does not take any unnecessary risks, but operates the platform safely within the technical possibilities.
The overheating protection (OTP) is present and is triggered on the heat sink at around 105 degrees Celsius. This threshold meets expectations and serves as a final safeguard if the temperature control of the fan is not sufficient or the air circulation in the housing is restricted. The short-circuit protection circuit (SCP) operates on all relevant rails and provides complete protection against earth faults, which is essential for overall safety.
The undervoltage protection circuit (UVP) functions reliably both at full load in the lowered voltage range of 180 volts and with even greater voltage dips down to 170 volts, without any damage occurring. This robustness is particularly important for power supply units that are designed exclusively for 200-240 volts, as voltage fluctuations in the European grid can occur in rare cases and must be safely intercepted.
The power supply unit also passes the measurements for conducted interference emissions in accordance with EN55032 and CISPR 32, which shows that the input filtering has been properly designed. No-load operation is also supported without any problems, which is relevant for modern mainboards with variable load states.
There is no fan failure protection, which would be able to switch off the device if the fan fails. The lack of this protective function is not unusual in this price range, but at the same time it should be kept in mind, as a mechanical fan failure is only detected late due to a rise in temperature, leaving a certain residual uncertainty. A MOV for overvoltages and an NTC for limiting the inrush current complete the basic protection components.
This results in a coherent and technically sufficiently safe protection concept that meets the intended use of the power supply unit. The reserves are practically dimensioned, the reactions to fault conditions are clearly defined and stable even under thermal load. Despite the aforementioned limitation in fan monitoring, the Vero L6 clearly meets the expectations of a power supply unit in its price class in this area.
Endorfy Vero L6 750W ATX 3.1 (EY7A014)
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