SilverStone ST75F-PT [7/12] Manual st75f pt p186 _st65f pt p187 _st55f pt p188 v1 5

3.7 PG-OK

3.8 3.3V Sense

PG-OK is a power good signal and should be asserted high by power supply to indicate that the +5 VDC

and +3.3 VDC outputs are above the under-voltage thresholds of the power supply. When this signal is

asserted high, there should be sufficient mains energy stored by the converter to guarantee continuous

power operation within specification. Conversely, when either the +5VDC or the +3.3VDC output voltage

falls below the under-voltage threshold, or when mains power has been removed for a time sufficiently

long so that power supply operation is no longer guaranteed, PG-OK should be deasserted to a low state.

See Figure 1 for a representation of the timing characteristics of the PG-OK,PS-ON, and germane power

rail signals.

A default 3.3V sense line should be implemented pin 13 of the connector.

3.9 Capacitive Load

The power supply should be able to power up and operate normally with the following capacitances

simultaneously present on the DC outputs.

In primary circuit of the power supply , a protected fuse is inserted. Only internal fault of the power supply

will cause the fuse blown. Any overload or short circuit at DC output will keep from fuse brown or fire hazard.

4.1 Input Protection

The +5V/+12V/+3.3V DC output are protected against the under voltage condition . range value can't

be exceed 3.3~3.7V at 5V terminal and 8.5~9.5V at 12V, 2.0~2.4V at 3.3V.

4.2 Output Protection

4.2.1 Under voltage protection

The +12V/ DC output are protected against the over voltage condition . Maximum value can't be over

15.5V at 12V.

4.2.2 Over Voltage Protection

The power supply can be used electronic circuit to limit the output current against exceeding 10%-60%

of surge output power or protected against excessive power delivery since short circuit of any output

or over total power at high line.

4.2.3 Over Power Protection

Output

+5V

+12V

+3.3V

-12V

+5VS

Capacitive load (uF)

6,000

8,000

6,000

350

4. Protection