rtd IPWR104HR-100W, User Manual

Page: 18 / 29

IPWR104HR 18
RTD Embedded Technologies, Inc
Main +5V converter for computer
The main +5V output is implemented with a monolithic, switch-mode DC-DC
converter module. The output current of this unit is 12A or 20A for the 60W and
100W versions. This converter has excellent dynamic and transient response
capabilities making it an ideal high-speed computer power supply. The output
current is internally limited against over current and short circuit faults.
The input of this converter is protected with a transient absorber diode and a
Schottky diode. These devices are necessary to protect the input in automotive
and industrial installations against overvoltage spikes and reverse voltage
transients. These situations exist in vehicle systems that use electrically controlled
hydraulic or pneumatic inductive valves.
The main +5V DC/DC converter is galvanically isolated. This improves reliability in
airborne and industrial applications. Isolation voltages can reach 1.5 KV.
The main +5V converter feeds the PC/104 AT bus +5V pins with power. This
power can be taken from the board from an external terminal block. (See previous
section for location of 5V output.)
Current Limit
To the device protect against fault or short-circuit conditions, the +5V DC/DC
converter module is equipped with a current limiting circuitry to provide continuous
overload protection. After reaching the current limit point, (typically 30 to 50% over
the rated current) this circuit will be active. Once the short circuit condition is
removed, the output will return to the nominal value without restarting the unit.
Remote On/Off control
Header connector X1 near the input-power connector terminal block is the remote
ON/OFF selection switch. Closing this connection will enable the IPWR104HR and
place the primary side circuits “ON”. When the X1 jumper is closed the
IPWR104HR will consume approximately 2.5W of power with no load. When the
X1 jumper is open the IPWR104HR will consume approximately 0.129W of power.
Sec12V and -12V converters for peripherals
A 5V to +-12V converter, with 92%(+12) and 83%(-12) efficiency, generates power
for peripheral devices such as EL- or TFT- panels, Hard drives, motors etc. The
+12V output delivers 2.0A of current. The +12V power is available from terminal
block TB3. The -12V power at 6 Watts is available from terminal block TB4. (See
previous section for locations.) . The +12V and -12V supplies also power the
PC/104 bus. -5V is an 100mA LDO cascaded off the -12V (only on ISA bus).