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Intel
®
Entry Server Chassis SC5299-E TPS Power Sub-system
Revision 3.1
Intel order number D37594-005
101
AC Input
Vout
PWOK
5VSB
PSON
T
sb_on_delay
T
AC_on_delay
T
pwok_on
T
vout_holdup
T
pwok_holdup
T
pson_on_delay
T
sb_on_delay
T
pwok_on
T
pwok_off
T
pwok_off
T
pson_pwok
T
pwok_low
T
sb_vout
AC turn on/off cycle
PSON turn on/off cycle
T
5VSB_holdup
Figure 20. Turn On/Off Timing (Power Supply Signals)
2.5.9 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 1 sec will reset the power supply.
2.5.9.1 Over-current Protection (OCP)
The power supply has a current limit to prevent the +3.3V, +5V, and +12V outputs from
exceeding the values shown in the following table. If the current limits are exceeded the power
supply will shut down and latch off. The latch will be cleared by toggling the PSON
#
signal or by
an AC power interruption. The 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. The 5VSB will auto recover after removing the OCP
limit.
Table 125. Over-current Protection (OCP)/240VA
Over-current Limit Peak Load*
Voltage
MIN MAX Peak Limit Delay
+3.3V 110% = 26.4A 150% = 36A
+5V 110% = 33A 150% = 45A
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