Intel® Server Board S3420GP TPS
Design and Environmental Specifications
Revision 2.4
Intel order number E65697-010
103
Item
Description
Minimum
Maximum
Units
T
5VSB_holdup
Duration for which the 5 VSB output voltage stays
within regulation after loss of AC.
70 N/A
Msec
Figure 42. Turn On/Off Timing (Power Supply Signals)
10.4.11
Residual Voltage Immunity in Standby Mode
The power supply is immune to any residual voltage placed on its outputs (typically, a leakage
voltage through the system from standby output) up to 500 mV. There is no additional heat
generated nor stressing of any internal components with this voltage applied to any individual
output and all outputs simultaneously. It also does not trip the power supply protection circuits
during turn on.
The residual voltage at the power supply outputs for a no-load condition does not exceed 100
mV when AC voltage is applied and the PSON# signal is de-asserted.
10.4.12
Protection Circuits
Protection circuits inside the power supply should cause only the power supply’s main outputs
to shut down. If the power supply latches off due to a protection circuit tripping, an AC cycle
OFF for 15 seconds and a PSON
#
cycle HIGH for 1 second should reset the power supply.
10.4.12.1
Over-current Protection (OCP)
The power supply has current limits to prevent the +3.3 V, +5 V, and +12 V outputs from
exceeding the values shown in the following table. If the current limits are exceeded, the power
supply shuts down and latches off. The latch is cleared by toggling the PSON
#
signal or using
an AC power interruption. The power supply is not damaged from repeated power cycling in this
condition. -12 V and 5 VSB are protected under over-current or shorted conditions so no
damage can occur to the power supply. Auto-recovery feature is a requirement on 5 VSB rail.
