Contents
- 1Introducing the Be Quiet! Straight Power 10 700 W CM (E10-CM-700W)
- 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 begins with the input bridge rectifier, the Lite-On GBJ25L06 which has its own heatsink. It can handle 25 A at 25 °C and 600 V continuously, or 320 A peak (for 8.3 ms). Its voltage drop (counting for losses) is 0.92 V per diode at 12.5 A. There are two transistors in the boost-type PFC circuit in parallel, the Infineon IPA60R160C6 (23.8/70 A at 600 V and 25 °C, RDS(On) 0.37 Ω at 11.3 A and 150 °C, 0.16 Ω at 25 °C). The diode is the common ST Micro STTH8R06FP (8/80 A at 600 V an 130 °C, drop of 2.9 V at 8 A and 25 °C, 1.8 V at 125 °C). The PFC coil seems capable enough, and although it doesn’t seem to have that many turns in the winding, it does use wire which is thicker than usual.
The bulk capacitor that gets charged from the PFC is a Teapo LG 390 μF/420 V. I measured its actual capacitance at 332 μF. This series has a minimum lifetime of 2000 hours at its maximum temperature (105 °C) and ripple. But being that it’s a Teapo, I don’t trust it that much. The switching transistors are two Infineon SPA11N80C3 (11/33 A at 25 °C and 800 V, RDS(On) 1.1 Ω at 7.1 A and 150 °C, 0.45 Ω) in parallel in FSP’s favourite active clamp forward topology. The clamping transistor is, as usual, the Fairchild FQPF3N80C (3/12 A at 25 °C and 800 V, RDS(On) 4.8 Ω at 1.5 A). All the power silicon here comes in a TO-220F package, mounted to a common primary heatsink.
As usual, a custom DIP-20 IC labeled as “6600” is used to drive the PFC, switching, and also the stand-by rail. Another garbage SC 47/35 capacitor filters its power source. The main transformer has a 39mm core and it’s filled with some sort of glue.
+5 V stand-by rail
As has been already stated, the “6600” chip is also responsible for the driving of the stand-by rail transistor. It’s the CET-MOS CEF02N7G (2/8 A at 25 °C and 700 V, RDS(On) 6.75 Ω at 1 A) in TO-220F package. It’s attached to its own tiny heatsink. The transformer is 19 mm in diameter.
A rectifier from ST Microelectronics is used, the STPS20L60CT (20/220 A at 60 V, drop of 0.74 V at 20 A and 25 °C) in a TO-220 package, which also has its own heatsink. Both the diodes are connected in parallel. In the Pi filter there is a Teapo SJ 3300/10 and an SZ 1500/10 capacitor. Just more garbage in my opinion. There’s also an NXP PSMN2R0-30YLE (100/1084 A at 25 °C and 30 V, RDS(On) 2 mΩ at 25 A and 25 °C, 3.8 mΩ at 175 °C) LFPAK transistor on the soldering side. It feeds the stand-by rail output from the +5 V while the main power supply is on to improve the efficiency.
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