HP 6005 HP Enterprise/Mid-Market Desktop PC Power Supply Architecture - Page 6

the smaller micro-fit connector design of the dc7700 and dc7800 SFF products. Instead of using the optional 6-pin connector defined by the ATX standard for the fan control signals, HP simply used a common fan connector used by other fans in the system. The primary reason for using this style of connector was that the dc5800 motherboard was shared between the SFF and MT chassis, and the MT required a rear chassis fan connection instead of the power supply fan connection. The fan connector was the solution shared by the SFF power supply fan and the MT rear chassis fan. In summary, the SFF power supply has not been fully compliant with the CFX12V industry standard, either electrically or mechanically, for many product generations. Ultra-Slim Desktop (USDT) The USDT form factor has evolved significantly since the dc7700 product. The small size of the dc7700 chassis did not allow the power supply to follow any industry standard mechanical form factor. The dc7700 USDT product did share the same non-standard, micro-fit power supply connector design as the dc7600 SFF described above. Earlier USDT products also had unique power supply designs. The dc7800 USDT product marked the introduction of the smaller USDT form factor, and it transitioned to the external power adapter solution following the HP notebook standard design described above. In summary, the USDT power supply has never followed any industry standard design. New HP +12V Power Supply Architecture Beginning with the 2009 introduction of the HP Compaq 6000/6005 Pro Series of business PCs, HP rolled out a new internal power supply architecture to replace the existing ATX power supply electrical interface standard for all future business PC products targeted to the enterprise and mid-market customer segments. The 2009 power supply mechanical form factors are very similar to the 2008 generation platforms. This new electrical interface (shown in Figure 2) consists of a 6-pin main power connector (replacing the 24-pin ATX connector), 4-pin 12V power connector (same as ATX), and a 6-pin control connector (different from optional ATX 6-pin connector). The operational voltages supplied by this interface are +12V, +12VSB, and -12V. The +5V, +3.3V, and +5VSB voltages defined by the ATX standard are generated on the motherboard. The motherboard then provides the +12V and +5V peripheral power that is traditionally provided directly by the power supply. Additional details can be found in the Technical Reference Guide for the HP Compaq 8000/8000f Elite Series. 6