Contents
- 1Introducing the Enermax MaxPro 600 W (EMP600AGT)
- 1.1Packaging and accessories
- 2Connectors & cabling
- 2.1Casing & cooling
- 3Input filtering
- 4Primary side
- 4.1+5 V stand-by rail
- 5Secondary side
- 5.1Build quality
- 6Load testing
- 6.1Loading +5 V SB
- 6.2Hold-up time
- 6.3Combined loading
- 6.4Combined loading ripple
- 6.5Crossloading, overloading
- 6.6Crossloading, overloading ripple
- 6.7Fan speed, temperatures and noise
- 7Conclusion and evaluation
- 7.1Thanks
- 7.2Discussion
Primary side
The primary side of the EMP600AGT begins with the input bridge rectifier, the GBU606. As it has no heatsink, it can only handle slightly less than 3 A at 100 °C and 600 V continuously, or 175 A peak (for 8.3 ms). This is one of the advantages of 230V designs, the currents are half of what they are with a 115 V input. The voltage drop (which counts for losses) is rated as 1 V per diode at 3 A. The PFC coil is also smaller as well as the power silicon. Two Shenzhen Great Power (Champion Micro) GPT10N50ADG (9.7/29.1 A at 500 V, RDS(On) 0.7 Ω at 5 A and 25 °C) transistors are used here. The diode is a Champion Micro bearing lable 8R06. But as the company only makes CMPFCD86 (8/200 A at 600 V, drop of 1.5 V at 8 A and 25 °C), I linked to that datasheet.
The bulk capacitor that gets charged from the PFC is a Nippon Chemi-Con KMR 330 μF/400 V. I measured its true capacity at 300 μF. This series has a minimum lifetime of 2000 hours at the maximum temperature (105 °C) and ripple. The switching transistors it feeds are the Champion Micro CMS6515 in a two-transistor forward configuration. I found no datasheet for them, but my guess would be that they’re 15 A/600 V. So all the power silicon is in the TO-220F packaging and mounted on a common black-anodized primary heatsink, and it’s also all from Champion Micro. Seems to me that they’ve been offering bulk discounts so CWT filled the EMP600AGT with their silicon…
As for the driving circuitry, more Champion Micro silicon here. Firstly, there’s the CM03X to reduce losses, and then the CM6805BC to drive the PFC/PWM. The datasheet implies it is not as good as the older CM6800 but only that it is “very close” to it. Besides it being all that “green mode” product, and requiring a smaller bulk cap, it comes in a smaller and cheaper SSOP-10 package. I think that’s its main advantage. Different values of Su’scon SD and JunFu WG caps are used within the driving circuitry, not the best choice.
+5 V stand-by rail
The stand-by rail in the EMP600AGT uses the common TNY177PN PWM microchip with integrated transistor (RDS(On) 9 Ω at 25 °C). Its switching frequency is 140 kHz maximum and with 230V input it is designed to accommodate up to 13 W. A transformer with a 20mm core is used.
A single diode in a DO-package is used for single-way rectification. Two capacitors in parallel are there for filtering. The first one is a C(r)apXon GF 2200/16, the second one is a Su’scon MF 1000/16. Nothing too great here really, but what what else would you expect for this price…
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