Technical Product Specification

System Power Sub-system Intel® Server System P4000IP and Intel® Workstation System P4000CR Family TPS
Revision 1.2 Intel order number G38159-002
75
Table 89. Output Voltage Timing
Description
Min
Max
Units
Output voltage rise time for each main output; 3.3V, 5V, -12V and
5Vstby.
1.0
20
msec
The main DC/DC converters (3.3V, 5V, -12V) shall be in regulation
limits within this time after the 12V input has reached 11.4V.
20
msec
The main DC/DC converters (3.3V, 5V, -12V) must drop below
regulation limits within this time after the 12V input has dropped
below 11.4V.
20
msec
The 5Vstby converter shall be in regulation limits within this time
after the 12Vstby has reach 11.4V.
20
msec
The 5Vstby converter must power off within this time after the
12Vstby input has dropped below 11.4V.
100
msec
2.4.2.16 Residual Voltage Immunity in Standby Mode
Each DC/DC converter is immune to any residual voltage placed on its respective output
(typically a leakage voltage through the system from standby output) up to 500mV. This
residual voltage does not have any adverse effect on each DC/DC converter, such as: no
additional power dissipation or over-stressing/over-heating any internal components or
adversely affecting the turn-on performance (no protection circuits tripping during turn on).
While in Stand-by mode, at no load condition, the residual voltage on each DC/DC converter
output does not exceed 100mV.
2.4.3 Protection Circuits
The PDB shall shut down all the DC/DC converters on the PDB and the power supply (from
PSON) if there is a fault condition on the PDB (OVP or OCP). If the PDB DC/DC converter
latches off due to a protection circuit tripping, an AC cycle OFF for 15sec min or a PSON# cycle
HIGH for 1sec shall be able to reset the power supply and the PDB.
2.4.3.1 Over-Current Protection (OCP)/240VA Protection
Each DC/DC converter output on PDB has individual OCP protection circuits. The PS+PDB
combo shall shutdown and latch off after an over current condition occurs. This latch shall be
cleared by toggling the PSON
#
signal or by an AC power interruption. The values are measured
at the PDB harness connectors. The DC/DC converters shall not be damaged from repeated
power cycling in this condition. Also, the +12V output from the power supply is divided on the
PDB into 3 channels and +12V3 is limited to 240VA of power. There are current sensors and
limit circuits to shut down the entire PS+PDB combo if the limit is exceeded. The limits are listed
in below table. -12V and 5VSB is protected under over current or shorted conditions so that no
damage can occur to the power supply. Auto-recovery feature is a requirement on 5VSB rail.