05
3.5 Hold-up Time
DC +5V output maintains at least 16mS after power off which hold within full load under
230V/50Hz condition.
3.6 5VSB
5VSB is requierd for the implementation of PS-ON described above. 5VSB is a standby voltage
that may be used to power circuits that require power input during the powered-down state of all
power rails. The 5 VSB pin should deliver 5V ±5% at a minimum of 3.0 A for PC board circuits to
operate. Conversely, PC board should draw no more than 3.0A maximum form this pin. This power
may be used to operate circuits such as soft power control.
3.7 PG-OK
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.
3.8 3.3V Sense
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.
Output
+5V
+12V
+3.3V
-12V
+5VS
Capacitive load (uF)
6,000
8,000
6,000
350
350
Содержание ST55F-G
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