RM23712 TPS
25
All current sharing functions shall be implemented internal to the power supply by making use of the
SBus signal. The power distribution board (Housing Back Plane), must connect the SBus signals
between the power supplies together.The power supply shall be able to share with up to 1+N supply
in parallel.
The failure of a power supply shall not affect the load sharing or output voltages of the other
supplies still operating.
The power supplies must be able to load share with 100mV of drop between different power supply’s
output.
If the load sharing is disabled by shorting the load share bus to ground, the power supply shall
continue to operate within regulation limits for loads less than or equal to the rating of one power
supply.
Table 25.Load share bus output characteristics
Voltage of load share bus at specified max output
current
Slope of load share bus voltage with changing load
3.2.3 Timing Requirements
These are the timing requirements for the power supply operation. The output voltages must rise
from 10% to within regulation limits (Tvout_rise) within 5 to 70ms. For 12Vsb, it is allowed to rise
from 1 to 25ms. All outputs must rise monotonically. Table below shows the timing requirements for
the power supply being turned on and off via the AC input, with PSON held low and the PSON signal,
with the AC input applied.
3.2.3.1 Output Voltage Timing
The timing of signals and outputs are specified in below Table 19 and illustrated in Figure 2.
Table 26.Turn on/off timing