SSI
ERP2U Power Supply Design Guide, V2.31
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Table 25: Turn On/Off Timing Item Description MIN MAX UNITS
Tsb_on_delay Delay from AC being applied to 5 VSB being
within regulation. 1500 ms
T ac_on_delay Delay from AC being applied to all output voltages
being within regulation. 2500 ms
Tvout_holdup Time all output voltages stay within regulation
after loss of AC. 18 ms
Tpwok_holdup Delay from loss of AC to deassertion of PWOK. 17 ms
Tpson_on_delay Delay from PSON# active to output voltages within
regulation limits. 5 400 ms
T pson_pwok Delay from PSON# deactive to PWOK being
deasserted. 50 ms
Tpwok_on Delay from output voltages within regulation limits
to PWOK asserted at turn on. 100 500 ms
T pwok_off Delay from PWOK deasserted to output voltages
(3.3 V, 5 V, 12 V, -12 V) dropping out of regulation
limits.
1 ms
Tpwok_low Duration of PWOK being in the deasserted state
during an off/on cycle using AC or the PSON#
signal.
100 ms
Tsb_vout Delay from 5 VSB being in regulation to O/Ps
being in regulation at AC turn on. 50 1000 ms
STATUS Recommended
Item Description MIN MAX UNITS
Tvout_holdup Time all output voltages stay within regulation
after loss of AC. 21 ms
Tpwok_holdup Delay from loss of AC to deassertion of PWOK. 20 ms
Tsb_holdup Time 5VSB output voltage stays within regulation
after loss of AC. 70 ms