Intel SE7520JR2 manual Dynamic Loading, Voltage Regulation Limits, Transient Load Requirements

Intel® Server Board SE7520JR2 Design and Environmental Specifications

8.2.5Voltage Regulation

The power supply output voltages must stay within the following voltage limits when operating at steady state and dynamic loading conditions. These limits include the peak-peak ripple/noise. All outputs are measured with reference to the return remote sense signal (ReturnS). The 5V, 12V1, 12V2, +12V3, –12V and 5VSB outputs are measured at the power supply connectors referenced to ReturnS. The +3.3V is measured at it remote sense signal (3.3VS) located at the signal connector.

Table 118: Voltage Regulation Limits

Parameter	Tolerance	Minimum	Nominal	Maximum	Units
+ 3.3V	- 5% / +5%	+3.14	+3.30	+3.46	Vrms
+ 5V	- 5% / +5%	+4.75	+5.00	+5.25	Vrms
+ 12V1	- 5% / +5%	+11.40	+12.00	+12.60	Vrms
+ 12V2	- 5% / +5%	+11.40	+12.00	+12.60	Vrms
+ 12V3	- 5% / +5%	+11.40	+12.00	+12.60	Vrms
- 12V	- 5% / +9%	-11.40	-12.00	-13.08	Vrms
+ 5VSB	- 5% / +5%	+4.75	+5.00	+5.25	Vrms

8.2.6Dynamic Loading

The output voltages shall remain within limits specified for the step loading and capacitive loading specified in the table below. The load transient repetition rate shall be tested between 50Hz and 5kHz at duty cycles ranging from 10%-90%. The load transient repetition rate is only a test specification. The ∆ step load may occur anywhere within the MIN load to the MAX load conditions.

Table 119: Transient Load Requirements

Output	∆ Step Load Size	Load Slew Rate	Test Capacitive Load
	(See note 2)
+3.3V	5.0A	0.25 A/∝sec	250 ∝F
+5V	4.0A	0.25 A/∝sec	400 ∝F
12V1+12V2+12V3	20.0A	0.25 A/∝sec	2200 ∝F 1, 3
+5VSB	0.5A	0.25 A/∝sec	20 ∝F

Notes

1.Step loads on each 12V output may happen simultaneously.

2.For Load Range 2 (light system loading), the tested step load size should be 60% of those listed.

3.The +12V should be tested with 1000∝F evenly split between the three +12V rails.

Revision 1.0	207
	C78844-002