Protection Circuits - Intel SC5299BRP Technical Product Specification

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Intel Entry Server Chassis SC5299-E TPS
Item
T Delay from loss of AC to de-assertion of PWOK.
pwok_holdup
T Delay from PSON
pson_on_delay
limits.
T Delay from PSON
pson_pwok
T Delay from output voltages within regulation limits to PWOK
pwok_on
asserted at turn on.
T Delay from PWOK de-asserted to output voltages (3.3V, 5V,
pwok_off
12V, -12V) dropping out of regulation limits.
T Duration of PWOK being in the de-asserted state during an
pwok_low
off/on cycle using AC or the PSON signal.
T Delay from 5VSB being in regulation to O/Ps being in
sb_vout
regulation at AC turn on.
T Time the 5VSB output voltage stays within regulation after
5VSB_holdup
loss of AC.
2.1.5.11 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 500mV. There is neither additional heat
generated, nor stress of any internal components with this voltage applied to any individual
output, and all outputs simultaneously. It also does not trip the protection circuits during turn on.
The residual voltage at the power supply outputs for no load condition does not exceed 100mV
when AC voltage is applied.
2.1.6

Protection Circuits

Protection circuits inside the power supply cause only the power supply's main outputs to
shutdown. If the power supply latches off due to a protection circuit tripping, an AC cycle OFF
for 15 sec and a PSON# cycle HIGH for 1sec will reset the power supply.
2.1.6.1 Over-Current Protection (OCP)
The power supply has a current limit to prevent the +3.3V, +5V, and +12V outputs from
exceeding 240VA. If the current limits are exceeded, the power supply will shut down and latch
off. The latch will be cleared by toggling the PSON
power supply will not be damaged from repeated power cycling in this condition. -12V and 5VSB
are protected under over current or shorted conditions so that no damage can occur to the
power supply. An auto-recovery feature exists on the 5VSB rail.
2.1.6.2 Over Voltage Protection (OVP)
The power supply over voltage protection is locally sensed. The power supply will shut down
and latch off after an over voltage condition occurs. This latch can be cleared by toggling the
#
PSON signal or by an AC power interruption. The following table contains the over voltage
Revision 3.1
Description
#
active to output voltages within regulation
#
deactive to PWOK being de-asserted.
Intel order number D37594-005
Minimum
20
5
100
1
100
50
70
#
signal or by an AC power interruption. The
Power Sub-system
Maximum Units
msec
msec
400
50 msec
msec
1000
msec
msec
msec
1000
msec
21