Embedded Power for
Timing Signal Definitions
Turn ON/OFF Timing
48 V Output rise time
Delay from AC being applied to 5 Vsb being within regulation.
Delay from AC being applied to all output voltages being within
Time all output voltages, including 5 Vsb, stay within regulation
after loss of AC.
Delay from loss of AC to de-assertion of PWOK
Delay from PSON# active to output voltages within regulation
Delay from PSON# de-active to PWOK being de-asserted.
Delay from loss of AC input to de-assertion of ACOK#.
Delay from output voltages within regulation limits to PWOK
asserted at turn on.
Delay from PWOK de-asserted to 48 V dropping out of regulation
Duration of PWOK being in the de-asserted state during an off/on
cycle using AC or the PSON# signal.
Delay from 5 Vsb being in regulation to 48 V being in
regulation at AC turn on.
Signals and Controls - All Models
5 of 7
The PSON# signal is required to remotely turn on/off the power supply. PSON# is an active low signal
that turns on the 48 V power rail. When this signal is not pulled low by the system, or left open, the
48 V output turns off. The 5 Vsb output remains on. This signal is pulled to a standby voltage by a
pull-up resistor internal to the power supply. The power supply fan(s) shall operate at the lowest speed.
PSON# Signal Characteristic
Accepts an open collector/drain input from
the system. Pulled-up to the 5 Vsb located in
PSON# = Low
PSON# = Open
Logic level low (power supply ON)
Logic level high (power supply OFF)
Source current, Vpson = low
Power up delay: Tpson_on_delay