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The CCSI RERP-303 1U Power Supply

Power supply design for 1U servers is another extremely challenging task due to several opposing design criteria. On the one hand we must provide more power for the higher speed dual CPU processor servers and on the other hand we have far less physical space available for the power supply plus we have to contend with the thermal issues described above. Increasing power output while significantly reducing the size, and providing the required thermal management of high output 1U power supplies is a daunting task, which is well beyond the abilities of the average conventional designer. In fact, with experienced engineering staff with many years of experience in designing high density systems and solving thermal management challenges, CCSI still spent over 2000 man-hours on these solutions and went through three different power supply designs to arrive at the final dual 300 watt power supply utilized in our RC 0103 1U chassis.

To solve these thermal obstacles and build "future proof" thermally correct high-density high performance 1U solutions, CCSI created a task force of engineering experts with one objective: to design and develop both 1U server solutions that meet and exceed the thermal requirements of not only today's but also future high performance CPU's.

 

3.1.1 A) Option 1 1+1 combined in parallel , load sharing control

Output #

Voltage

V1

+5V

V2

+3.3V

V3

+12V1

V4

+12V2

V5

-5V

V6

-12V

V7

5VSB

Max. Load

40A

40A

15A

15A

0.3A

0.8A

2A

Min. Load

2A

0.5A

0.5A

0.5A

0A

0A

0A

Load Reg.

5 %

+4/-3 %

5 %

5 %

5 %

5 %

5%

Cross Reg.

5 %

+4/-3 %

5 %

5 %

5 %

5 %

5%

Line Reg.

1%

1%

1%

1%

1 %

1 %

1%

Ripple & Noise

50mV

50mV

120mV

120mV

100mV

120mV

50mV

Note 1: The +5 & +3.3 Volt total output shall not exceed 300 Watts.

Note 2: The +5, +12 & +3.3 Volt total output shall not exceed 540 Watts.

Note 3: The +12V1 & +12V2 outputs of the power supply must be capable of 18 Amps peak for 10 seconds. A +/-10% tolerance is permissible. Output voltage is measured at the load and of the output cable. There is NO redundancy on the +12V1 & +12V2.

Note 4: Noise bandwidth is from DC to 20 MHz.

Note 5: Regulation tolerance shall include temperature change, warm up drift and dynamic load.

3.1.2 B) Option 2 operating under redundant application

Output #

Voltage

V1

+5V

V2

+3.3V

V3

+12V

V5

-5V

V6

-12V

V7

5VSB

Max. Load

30A

28A

15A

0.3A

0.8A

2A

Min. Load

2A

0.5A

0.5A

0A

0A

0A

Load Reg.

5 %

+4/-3 %

5 %

5 %

5 %

5%

Cross Reg.

5 %

+4/-3 %

5 %

5 %

5 %

5%

Line Reg.

1%

1%

1%

1 %

1 %

1%

Ripple & Noise

50mV

50mV

120mV

100mV

120mV

50mV

Note 1: The +5 & +3.3 Volt total output shall not be exceed 180 Watts.

Note 2: The +5, +12 & +3.3 Volt total output shall not be exceed 280 Watts.

Note 3: The +12V outputs of the power supply must be capable of 18 Amps peak for 10 seconds. A +/-10% tolerance is permissible. Output voltage is measured at the load and of the output cable.

Note 4: Noise bandwidth is from DC to 20 MHz.

Note 5: Regulation tolerance shall include temperature change, warm up drift and dynamic load.

 

 

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