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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