JHW250S30R21-18T Datasheet, PDF (8/14 Pages) Lineage Power Corporation – 36 - 75 Vdc Input; 30.2Vdc Output; 250W

JHW250S30R2 Power Module; dc-dc Converter
36 – 75 Vdc Input; 30.2Vdc Output; 250W
Data Sheet
October 6, 2005
ƒ One pole of the input and one pole of the output
are to be grounded, or both circuits are to be kept
floating, to maintain the output voltage to ground
voltage within ELV or SELV limits.
“W” Versions only - For all input sources, other than DC
MAINS, where the input voltage is between 60 and 75V
dc (Classified as TNV-2 in Europe), the following must
be meet, if the converter’s output is to be evaluated for
SELV:
ƒ The input source is to be provided with reinforced
insulation from any hazardous voltage, including the
ac mains.
ƒ One Vi pin and one Vo pin are to be reliably
earthed, or both the input and output pins are to be
kept floating.
ƒ Another SELV reliability test is conducted on the
whole system, as required by the safety agencies, on
the combination of supply source and the subject
module to verify that under a single fault, hazardous
voltages do not appear at the module’s output.
Remote On/Off
Two remote on/off options are available. Positive logic
remote on/off turns the module on during a logic-high
voltage on the ON/OFF pin, and off during a logic low.
Negative logic remote on/off turns the module off during
a logic high and on during a logic low. Negative logic,
device code suffix "1," is the factory-preferred
configuration. To turn the power module on and off, the
user must supply a switch to control the voltage between
the on/off terminal (Von/off) and the V_I (-) terminal. The
switch can be an open collector or equivalent (see
Figure 16). A logic low is Von/off = 0 V to 0.8 V. The
maximum Ion/off during a logic low is 50 µA. The switch
should maintain a logic-low voltage while sinking this 50
µA. During logic high, the maximum Von/off generated
by the power module is 5 V. The maximum allowable
leakage current of the switch at Von/off = 5V is 10 µA. If
not using the remote on/off feature, perform one of the
following to turn the unit on:
For negative logic, short ON/OFF pin to V_IN(-).
For positive logic: leave ON/OFF pin open.
All Versions - The power module has ELV (extra-low
voltage) outputs when all inputs are ELV.
All flammable materials used in the manufacturing of
these modules are rated 94V-0.
Figure 16. Remote On/Off Implementation
The input to these units is to be provided with a
maximum 15A, (JHW250 series) fast-acting fuse in the
unearthed lead.
Feature Descriptions
Overcurrent Protection – Auto-Restart
To provide protection in a fault output overload condition,
the module is equipped with internal current-limiting
circuitry. As the load current is increased beyond its
limit, the module will start to fold back its output voltage
hence limiting output power. In the event of a severe
overload where the output voltage is pulled lower than
approximately 21V the module will enter hiccup mode to
further reduce the power dissipation of the module. The
module can survive a continuous short circuit. Once the
overload has been removed the module will auto-restart
and normal operation will resume.
Remote sense
Remote sense minimizes the effects of distribution
losses by regulating the voltage at the remote-sense
connections. 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(-)] ≤X% of V_o,nom.
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
8
Tyco Electronics Power Systems