SilverStone ST45SF-G - Manual (Page 4)

SFX Form Factor
05
4. TIMING
4.1 Signal timing drawing
Figure 2 is a reference for signal timing for main power connector signals and rails.
(1) T2: Rise time (0.2ms~20ms)
(2) T3: Power good signal turn on delay time (100ms~500ms)
(3) T4: Power good signal turn off delay time (1ms min)
(4) T5: Rise time (10ms max)
Figure 2. PS-OK Timing Sequence
3.5 No load operation
No damage or hazardous condition should occur with all the DC output connectors
disconnected from the load.The power supply may latch into the shutdown state.
3.6 Under voltage protection.
In an under voltage fault occurs, the supply will latch all DC outputs into a shutdown
state when +12V,+5V & +3.3V outputs under 85% of it's maximum value.
06
Output voltages should remin within the remain within the regulation limits of
Section 2.1,and the power supply should stable when subjected to load transients
per Table 13. from any steady state load,including any or all of the following
conditions:
*Simultaneous load steps on the +12 VDC,+5 VDC,and +3.3 VDC outputs
(all steps occurring in the same direction)
*Load-changing repetition rate of 50 Hz to 10 kHz
*AC input range per Section 1.0
4.3 Hold up time
When the power loss its input power, it shall maintain 16ms at full load in regulation
for 300W limit at normal input voltage. (AC:115V/60Hz or 230V/50Hz)
When the power loss its input power, it shall maintain 16ms at 75% load in regulation
for 450W limit at normal input voltage. (AC:115V/60Hz or 230V/50Hz)
4.2 .Output Transient Response
Table 13. summarizes the expected output transient step sizes for each output.
The transient load slew rate is =1.0A/us.
(1) For example,for a rated +5 VDC output of 18A,the transient step would be 30% x 18A=5.4A
Table 13. DC Output Transient Step Sizes
+12VDC
+5VDC
+3.3VDC
-12VDC
+5VSB
Max.step size
(% of rated output amps per Sec 3.2.3)(1)
40%
30%
30%
Max.step size
(amps)
0.1A
0.5A
Output