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3. PROTECTION

The power supply shall have current limit to prevent the +3.3 V, +5 V, and +12 V outputs

from exceeding the values shown in Table 28. If the current limits are exceeded the power

supply shall shutdown and latch off. The latch will be cleared by toggling the PSON# signal

or by an AC power interruption. The power supply shall not be damaged from repeated

power cycling in this condition. -12 V and 5 VSB shall be protected under over current or

shorted conditions so that no damage can occur to the power supply. All outputs shall be

protected so that no damage occurs to the power supply under a shorted output condition.

3-1. Over current protection

Voltage

3-2. 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.

3-3. Over voltage protection

output

+12 VDC

+5 VDC

+3.3 VDC

Minimum

13.4

5.74

3.76

Nominal

15.0

6.3

4.2

Maximum

16.6

4.50

Unit

Volts

The over voltage sense circuitry and reference shall reside in packages that are separate

and distinct from the regulator control circuity and reference. No single point fault shall be

able to cause a sustained over voltage condition on any or all outputs. The supply shall

provide latch-mode over voltage protection as defined in Table.

+3.3 V

+5 V

+12 V

110% minimum

150% maximum

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SilverStone ST1500 Handbuch Seite 6