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EPS2U Power Supply Design Guide, V2.1
V4
V3
V2
V1
T
vout_off
T
vout_on
T
vout
_
rise
10% Vout
Vout
Figure 2: Output Voltage Timing
Table 24: Turn On/Off Timing
Item Description MIN MAX UNITS
T
sb_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
T
vout_holdup
Time all output voltages stay within regulation
after loss of AC.
18 ms
T
pwok_holdup
Delay from loss of AC to deassertion of PWOK. 17 ms
T
pson_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
T
pwok_on
Delay from output voltages within regulation limits
to PWOK asserted at turn on.
100 1000 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
T
pwok_low
Duration of PWOK being in the deasserted state
during an off/on cycle using AC or the PSON#
signal.
100 ms
T
sb_vout
Delay from 5 VSB being in regulation to O/Ps
being in regulation at AC turn on.
50 1000 ms
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