Technical Product Specification

Power Sub-system Intel® Server System SC5650HCBRP TPS
Revision 1.2
Intel order number E81443-002
72
Table 31. PSON# Signal Characteristic
Signal Type Accepts an open collector/drain input from the system.
Pull-up to VSB located in power supply.
PSON# = Low ON
PSON# = High or Open OFF
MIN MAX
Logic level low (power supply ON) 0V 1.0V
Logic level high (power supply OFF) 2.0V 5.25V
Source current, Vpson = low 4mA
Power up delay: Tpson_on_delay 5msec 400msec
PWOK delay: T pson_pwok 50msec
4.1.5.2 PSKill
The purpose of the PSKill pin is to allow for hot swapping of the power supply. The PSKill pin on
the power supply is shorter than the other signal pins. When a power supply is operating in
parallel with other power supplies and then extracted from the system, the PSKill pin will quickly
turn off the power supply and prevent arcing of the DC output contacts. T
PSKill
(shown in the
following table) is the minimum time delay from the PSKill pin un-mating to when the power pins
un-mate. The power supply must discharge its output inductor within this time from the unmating
of the PSKill pin. When the PSKill signal pin is not pulled down or left open (power supply is
extracted from the system), the power supply shuts down regardless of the condition of the
PSON# signal. The mating pin of this signal in the system should be tied to ground. Internal to
the power supply, the PSKill pin should be connected to a standby voltage through a pull-up
resistor. Upon receiving a LOW state signal at the PSKill pin, the power supply is allowed to turn
on via the PSON# signal. A logic LOW on this pin by itself should not turn on the power outputs.
Table 32. PSKILL Signal Characteristics
Signal Type (Input Signal to Supply) Accepts a ground input from the system. Pull-up to VSB
located in the power supply.
PSKILL = Low, PSON# = Low ON
PSKILL = Open, PSON# = Low or Open OFF
PSKILL = Low, PSON# = Open OFF
MIN MAX
Logic level low (power supply ON) 0 V 1.0 V
Logic level high (power supply OFF) 2.0 V 5.25 V
Source current, Vpskill = low 4 mA
Delay from PSKILL=High to power supply turned
off (TPSKill)1
100 μs
Note:
1. T
PSKill
is the time from the PSKill signal de-asserting HIGH to the power supply’s output inductor
discharging.