Data Sheet
JNW350R Power Modules; DC-DC Converters
36 – 75 Vdc Input; 28Vdc Output; 350W Output
July 27, 2009
Safety Considerations (continued)
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:
The input source is to be provided with reinforced
insulation from any hazardous voltage, including
the ac mains.
One Vi pin and one Vo pin are to be reliably
earthed, or both the input and output pins are to
be kept floating.
Figure 10. Circuit configuration for using Remote
On/Off Implementation.
Overcurrent Protection
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.
To provide protection in a fault output overload
condition, the module is equipped with internal current
limiting protection circuitry, and can endure
overcurrent transient overloads depending upon the
duration and amplitude of the overload. An internal
buffer measures the relative product of the duration
and amplitude of the overload and allows operation
until a limit threshold is reached. For lower amplitude
overloads, the module will operate without shutdown
for a longer transient overload. If the overload
amplitude is larger, the module will reach shutdown in
a shorter period of time.
All flammable materials used in the manufacturing of
these modules are rated 94V-0, or tested to the
UL60950 A.2 for reduced thickness.
The input to these units is to be provided with a
maximum 20 A fast-acting or time-delay fuse in the
unearthed lead.
A latching shutdown option is standard. If overcurrent
persists for beyond the overload buffer, the module
will
shut down and remain off until the module is reset by
either cycling the input power or by toggling the on/off
pin for one second.
Feature Description
Remote On/Off
An auto-restart option (4) is also available in a case
where an auto recovery is required. If overcurrent
persists for few milli-seconds, the module will shut
down and auto restart until the fault condition is
corrected. If the output overload condition still exists
when the module restarts, it will shut down again. This
operation will continue indefinitely, until the
Two remote on/off options are available. Positive logic
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, device code suffix “1”, turns the
module off during a logic high and on during a logic
low.
overcurrent condition is corrected.
To turn the power module on and off, the user must
supply a switch (open collector or equivalent) to
control the voltage (Von/off) between the ON/OFF
terminal and the VIN(-) terminal (see Figure 10). Logic
low is 0V ≤ Von/off ≤ 1.2V. The maximum Ion/off during a
logic low is 1mA, the switch should be maintain a
logic low level whilst sinking this current.
Over Voltage Protection
The output overvoltage protection consists of circuitry
that monitors the voltage on the output terminals. If
the voltage on the output terminals exceeds the over
voltage protection threshold, then the module will
shutdown and latch off. The overvoltage latch is reset
by either cycling the input power for one second or by
toggling the on/off signal for one second. The
During a logic high, the typical maximum Von/off
generated by the module is 5V, and the maximum
allowable leakage current at Von/off = 5V is 50μA.
protection mechanism is such that the unit can
continue in this condition until the fault is cleared.
If not using the remote on/off feature:
For positive logic, leave the ON/OFF pin open.
For negative logic, short the ON/OFF pin to VIN(-).
An auto-restart option (4) is also available in a case
where an auto recovery is required.
LINEAGE POWER
7
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
