SE7221BK1-E Technical Product Specification

10.2 Power Supply Specifications

This section provides power supply design guidelines for the baseboard, including voltage and current specifications, and power supply on/off sequencing characteristics.

Table 79. The Board Power Supply Voltage Specification

PARAMETER

TOLERANCE

MIN

NOM

MAX

UNITS

+ 3.3V

- 5% / +5%

+3.14

+3.30

+3.46

Vrms

 

 

 

 

 

 

+ 5V

- 5% / +5%

+4.75

+5.00

+5.25

Vrms

 

 

 

 

 

 

+ 12V

- 5% / +5%

+11.40

+12.00

+12.60

Vrms

 

 

 

 

 

 

- 12V

- 10% / +10%

-11.40

-12.00

-13.08

Vrms

 

 

 

 

 

 

+ 5VSB

- 5% / +5%

+4.75

+5.00

+5.25

Vrms

 

 

 

 

 

 

10.2.1Power Timing Requirements

These are the timing requirements for the power supply operation. The output voltages must rise from 10% to within regulation limits (Tvout_rise) within 5 to 70ms, except for 5VSB - it is allowed to rise from 1.0 to 70ms. The +3.3V, +5V and +12V output voltages should start to rise approximately at the same time. All outputs must rise monotonically. The +5V output needs to be greater than the +3.3V output during any point of the voltage rise. The +5V output must never be greater than the +3.3V output by more than 2.25V. Each output voltage shall reach regulation within 50ms (Tvout_on) of each other during turn on of the power supply. Each output voltage shall fall out of regulation within 400msec (Tvout_off) of each other during turn off. Refer to the table below for the timing requirements for the power supply being turned on and off via the AC input, with PSON held low and the PSON signal, with the AC input applied.

Table 80. Output Voltage Timing

Item

Description

MIN

MAX

Tvout_rise

Output voltage rise time from each main output.

5.0 *

70 *

 

 

 

50

Tvout_on

All main outputs must be within regulation of each

 

 

other within this time.

 

 

 

 

 

400

T vout_off

All main outputs must leave regulation within this

 

 

time.

 

 

 

 

 

 

The 5VSB output voltage rise time shall be from 1.0ms to 25.0ms

UNITS

msec

msec

msec

69

Page 81
Image 81
Intel SE7221BK1-E manual Power Supply Specifications, Power Timing Requirements, Board Power Supply Voltage Specification