FNW500R4 Datasheet, PDF (9/13 Pages) Lineage Power Corporation – 36 - 75 Vdc Input; 28Vdc Output; 500W Output

Data Sheet
September 8, 2008
FNW500R Power Modules; DC-DC Converters
36 – 75 Vdc Input; 28Vdc Output; 500W Output
Feature Description (continued)
Remote sense
Remote sense minimizes the effects of distribution
losses by regulating the voltage at the remote-sense
connections (see Figure 13). For No Trim or Trim down
application, the voltage between the remote-sense pins
and the output terminals must not exceed the output
voltage sense range given in the Feature Specifications
table i.e.:
[Vo(+) – Vo(-)] – [SENSE(+) – SENSE(-)] ≤ 2% of
V_o,nom.
The voltage between the Vo(+) and Vo(-) terminals
must not exceed the minimum output overvoltage shut-
down value indicated in the Feature Specifications
table. This limit includes any increase in voltage due to
remote-sense compensation and output voltage set-
point adjustment (trim). See Figure 13. If not using the
remote-sense feature to regulate the output at the point
of load, then connect SENSE(+) to Vo(+) and SENSE(-
) to Vo(-) at the module.
Although the output voltage can be increased by both
the remote sense and by the trim, the maximum
increase for the output voltage is not the sum of both.
The maximum increase is the larger of either the
remote sense or the trim. The amount of power
delivered by the module is defined as the voltage at the
output terminals multiplied by the output current. When
using remote sense and trim: the output voltage of the
module can be increased, which at the same output
current would increase the power output of the module.
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
approximately 20 ºC the converter will automatically
restart.
The module can be restarted by cycling the dc input
power for at least one second or by toggling the remote
on/off signal for at least one second.
Auxiliary Power Output
The module has an auxiliary power output, available on
pin 16, referenced to the Sense- pin. The output is
derived from the internal secondary bias supply and is
capable of delivering up to 15 mA, with a voltage range
that varies between 9V_dc and 13 V_dc. This supply is
typically used to drive LEDs. To prevent internal
module damage, do not connect or short this pin to any
other pin on the module.
Power Good Signal
The module contains a power good signal on pin 15,
consisting of an open collector circuit that is referenced
to the Sense- pin on the secondary side of the module.
The power good signal is active low, when the module
is operating normally. The maximum current that can
sunk at this pin, during normal operation active low, is
35 mA_dc, and the maximum voltage allowed on the pin,
during module abnormal operation active high, is 35V_dc.
During transient load changes or during overcurrent
hiccup events, the sanity of the power good signal is
not guaranteed.
Figure 13. Effective Circuit Configuration for Single-
Module Remote-Sense Operation Output Voltage.
Over Temperature Protection
The FNW500R module provides with non-latching over
temperature protection. A temperature sensor monitors
the operating temperature of the converter. If the
reference temperature exceeds a threshold of 106 °C
(typical) at the center of the baseplate, the converter
will shut down and disable the output. When the
baseplate temperature has decreased by
LINEAGE POWER
9