RM23712 TPS
26
Figure 16.Turn On/Off Timing (Power Supply Signals)
3.2.3.2 Overshoot
Any output overshoot at turn on shall be less than 10% of the nominal output value.
3.2.3.3 Undershoot
Any output shall not undershoot at turn on or off cycle under any circumstances.
3.2.3.4 Temperature coefficient
After operating for 30 minutes or longer at 25 °C ambient, the output voltages shall not change by
more than ± 0.05% per degree C for any given line and load conditions.
3.2.4 Control and Indicator functions
The following section define the input and output signals from the power supply.
Signals that can be defined as low true use the following convention:
Signal
#
= low true.
3.2.4.1 PSON
#
Input Signal (Power supply enable)
The PSON
#
signal is required to remotely turn on/off the main output of the power supply.
PSON
#
is and active low signal that turns on the main output power rail. When this signal is not
pulled low by the system or left open, the outputs (except the Standby output) turn off.
PSON
#
is pulled to a standby voltage by a pull-up resistor internal to the power supply.
See Table 20.
Table 27.PS ON
#
signal characteristics
Accepts an open collector/drain input from the system.
Pull-up to +3.3V located in the power supply.
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