TPCMQ DC/DC CONVERTER SERIES
OPERATING MANUAL
7
C O R P O R A T I O N
9.0
DESCRIPTION OF FEATURES & OPTIONS
FEATURE / OPTION
DESCRIPTION
Wide Range DC Input
The DC input range is from 40 to 60 or 20 to 30VDC.
EMI Input Filter
This fi lter suppresses conducted noise from the converter back
onto the DC input line.
Inrush Current Limiting
When the converter is turned on, the input inrush current is lim-
ited by an electronic circuit.
Output Voltage
Adjustment
The output voltage adjustment range for all models is approxi-
mately -25 to +10% of the nominal output voltage, made at the
input to the remote adjust terminal. There is also a trimming
potentiometer on the top of the case which gives a smaller output
adjustment range of about ±5%.
Remote Output Adjust
This input is used to remotely adjust each converter output volt-
age. An analog voltage from 0 to +5V controls approximately -25
to +10% output range. This input can be controlled externally by
a power control system. The module analog inputs can also be
connected together so that the external control voltage adjusts all
the module outputs simultaneously.
Thermal Protection
If the converter module overheats internally, it will automatically
shut down. The Output Power Good LED turns off, the Output
Power Good signal goes HI and the Overtemperature Warning
signal goes HI.
Current Sharing
The TPCMQ converter modules are automatically connected to
current share with each other when they are inserted into the
rack/shelf. A single-wire connection provides this. The modules
current share with an accuracy of 10% of their full load output
current for total loads of 50% to 100%. The rack/shelf current
share pin can be used to current share with another rack/shelf of
the same output voltage.
ORing Diode
This diode in series with the module output protects the parallel-
connected modules. If the output of one module fails to a short or
to a lower than normal output voltage, the other modules are not
affected. Also when hot-swapping modules, the diode prevents
a glitch in the output voltage while the output is still rising on the
inserted module. The 5V 250mA standby output also has an OR-
ing diode.
Overvoltage Protection
The output is protected from overvoltage due to fault conditions
in the module. Overvoltage protection is set at greater than 110%
of the output voltage. The result is a latched shutdown of the
converter module. It is reset by cycling the DC input off and then
back on.
