Intel SC5650BCDP User Manual

+3.3V 

+5V 

+12V(1,2,3,4) 

-12V 

+5VSB 

50mVp-p 50mVp-p  120mVp-p 120mVp-p 50mVp-p 

 

3.1.5.13 

Timing Requirements 

The timing requirements for power supply operation are as follows. The output voltages must 
rise from 10% to within regulation limits (T

vout_rise

) within 5 to 70ms, except for 5VSB which is 

allowed to rise from 1.0 to 25ms. The +3.3V, +5V and +12V output voltages start to rise at 
approximately 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 reaches regulation 
within 50ms (T

vout_on

) of each other during turn on of the power supply. Each output voltage falls 

out of regulation within 400msec (T

vout_off

) of each other during turn off. The following table 

shows 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. 

Item 

Description 

Minimum 

Maximum 

Units 

T

vout_rise

 

Output voltage rise time from each main output. 

5.0* 

70* 

msec 

T

vout_on

 

All main outputs must be within regulation of each 
other within this time. 

 50 

msec 

T 

vout_off

 

All main outputs must leave regulation within this 
time. 

 400 

msec 

* The 5VSB output voltage rise time shall be from 1.0 ms to 25 ms