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4. TIMING

4-1. Signal timing drawing

Figure 2. is a reference for signal timing for main power connector signals and

Figure 2. PW-OK Timing Sequence

VAC

PS-ON

+12V/+5V/+3.3V O/P

pw-OK

pw-OK Sense level=95% of

nominal

off

95%

10%

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.

3-4. Short circuit

An output short circuit is defined as any output impedance of less than 0.1 ohms.The

power supply shall shut down and latch off for shorting the +3.3 VDC,+5 VDC,or+12 VDC

rails to return or any other rail. Shorts between main output rails and +5VSB shall not

cause any damage to the power supply. The power supply shall either shut down and

latch off or fold back for shorting the negative rails.+5VSB must be capable of being

shorted indefinitely, but when the short is removed, the power supply shall recover

automatically or by cycling PS_ON#.The power supply shall be capable of withstanding

a continuous short-circuit to the output without damage or overstress to the unit.

(1)T3: Power good signal turn on delay time (100ms~500ms

)

(2)T4: Power good signal turn off delay time (1ms min)

(3)T5: Rise time (5~70ms max)

(4)T6: Hold up time (16ms min)

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SilverStone ST1500 Handbuch Seite 7