RM23712 TPS
24
The power supply shall operate within specifications over the capacitive loading ranges defined
below in table 23.
Table 24.Capacitive Loading Conditions
3.2.2.9 Close loop stability
The power supply shall be unconditionally stable under all line/load/transient load conditions
including capacitive load ranges. A minimum of: 45 degrees phase margin and -12dB-gain margin is
required.
Closed-loop stability must be ensured at the maximum and minimum loads as applicable.
3.2.2.10 Residual Voltage Immunity in Standby mode
The power supply should be immune to any residual voltage placed on its outputs (typically a
leakage voltage through the system from standby output) up to 500mV. There shall be no additional
heat generated nor stressing of any internal components with this voltage applied to any individual
or all outputs simultaneously. It also should not trip the protection circuits during turn on/off.
The residual voltage at the power supply outputs for no load condition shall not exceed 100mV when
AC voltage is applied.
3.2.2.11 Soft starting
The power supply shall contain control circuit which provides monotonic soft start for its outputs
without overstress of the AC line or any power supply components at any specified AC line or load
condition.
3.2.2.12 Hot Swap Requirements
Hot swapping a power supply is the process of inserting and extracting a power supply from an
operating power system. During this process the output voltages shall remain within the limits with
the capacitive load specified.
The hot swap test must be conducted when the system is operating under static, dynamic, and zero
loading conditions.
The power supply shall use a latching mechanism to prevent insertion and extraction of the power
supply when the AC power cord is inserted into the power supply.
3.2.2.13 Load sharing control
The +12 V output shall have active load sharing. When operating at 50% of full load, the output
current of any 1+1 power supplies shall be within (+/-10%). For example, if power supply #1 is
operating at 20A, then all other power supplies within the system shall be operating between 18A to
22A (+/- 10% of 20A).
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