Part Analysis
| General Data | |
| Manufacturer (OEM) | HEC |
| PCB Type | Single-Sided |
| Primary Side | |
| Transient Filter | 4x Y caps, 3x X caps, 2x CM chokes, 1x MOV, 1x Power Integrations CAP200DG (Discharge IC) |
| Inrush Protection | NTC Thermistor SCK-037 (3 Ohm) & Relay |
| Bridge Rectifier(s) |
2x GBU10K (800V, 10A @ 100°C)
|
| APFC MOSFETs |
2x Infineon IPA60R120P7 (650V, 16A @ 100°C, Rds(on): 0.120Ohm)
|
| APFC Boost Diode |
1x Wolfspeed C6D06065A (650V, 6A @ 155°C)
|
| Bulk Cap(s) |
1x Teapo (400V, 470uF, 2,000h @ 105°C, LG)
|
| Main Switchers |
2x Infineon IPA60R120P7 (650V, 16A @ 100°C, Rds(on): 0.120Ohm)
|
| APFC Controller |
Champion CM6500UNX & CM03AX
|
| Resonant Controller | Champion CM6901T6X |
| Topology |
Primary side: APFC, Half-Bridge & LLC Resonant converter
Secondary side: Synchronous Rectification & DC-DC converters |
| Secondary Side | |
| +12V MOSFETs | no info |
| 5V & 3.3V | DC-DC Converters: 2x Potens Semiconductor PDC39F2BX (30V, 76A @ 100°C, Rds(on): 2.95mOhm) PWM Controller(s): 1x ANPEC APW7159C |
| Filtering Capacitors | Electrolytic: 6x Teapo (1-3,000h @ 105°C, SC), 2x Nippon Chemi-con (2-5,000h @ 105°C, KZE) 1x Rubycon (4-10,000h @ 105°C, YXF) Polymer: 6x Teapo, 16x |
| Supervisor IC | Weltrend WT7527RT (OCP, OVP, UVP, SCP, PG) |
| Fan Controller | Nuvoton M031FB0AE |
| Fan Model | Hong Hua HA1225H12F-Z (120mm, 12V, 0.58A, Rifle Bearing Fan) |
| 5VSB Circuit | |
| Rectifier |
1x PS1060L SBR (60V, 10A)
|
| Standby PWM Controller | Excelliance MOS EM8569D |
The PCB is small and densely populated. HEC used two vertical boards to save space, one hosting the DC-DC converters that generate the minor rails and one with the FETs that regulate the 12V rail. The heatsinks are large enough to meet the unit’s thermal needs without using excessive active cooling, hence keeping noise output low.
The 12V board is next to the main transformer to minimize energy losses. The platform’s design is typical: a half-bridge topology on the primary side and an LLC resonant converter. The secondary uses a synchronous rectification scheme for the 12V rail, which feeds a pair of VRMs to generate the minor rails. The soldering quality is good, and the parts that HEC used are of good quality, but they do not belong to top manufacturers to keep the production cost under control. The cooling fan is by Hong Hua and uses a rifle bearing instead of a fluid dynamic one. There have to be some differences between the higher-end RMx line and the RMe one, or else users won’t opt to buy the more expensive RMx models.
