JNW350R631-18Z Lineage Power, JNW350R631-18Z Datasheet - Page 11

• Manufacturer Part Number: JNW350R631-18Z
• Description: DC/DC Converters & Regulators 36-75V 28Vout 12.5A Neg TH Pin 3.68mm
• Manufacturer: Lineage Power

Specifications of JNW350R631-18Z

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: CC109161931

Data Sheet
August 9, 2010
R
capacitors up to 8000F that might be needed for an
application to meet output ripple and noise
requirements. Selecting R
Table 2 will ensure stable operation of the module
In applications with tight output voltage limits in the
presence of dynamic current loading, additional
output capacitance will be required. Table 2 lists
recommended values of R
meet 2% output voltage deviation limits for some
common output voltages in the presence of a 6A to
12A step change (50% of full load), with an input
voltage of 48V.
Table 1. General recommended values of of R
and C
ceramic capacitor combinations.
Table 2. Recommended values of R
to obtain transient deviation of 2% of Vout for a
6A step load with Vin=48V.
Please contact your Lineage Power technical
representative to obtain more details of this feature as
well as for guidelines on how to select the right value
of external R-C to tune the module for best transient
performance and stable operation for other output
capacitance values.
Over Temperature Protection
The JNW350R 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 110
ºC (typical) at the center of the baseplate, the
converter will shut down and disable the output. When
the baseplate temperature has decreased by
approximately 20 ºC the converter will automatically
restart.
Thermal Considerations
The power modules operate in a variety of thermal
environments; however, sufficient cooling should be
provided to help ensure reliable operation of the unit.
Heat-dissipating components inside the unit are
thermally coupled to the case. Heat is removed by
conduction, convection, and radiation to the
surrounding environment. Proper cooling can be
verified by measuring the case temperature. Peak
LINEAGE
R
R
C
C
Cout(µF)
TUNE
V(mV)
C
TUNE
TUNE
TUNE
TUNE
o
Vo
(uF)
(k
(pF)
(k
(pF)
TUNE
and C
POWER
for V
1000
TUNE
32V
880
820
530
1100
1500
348
out
for different values of ceramic output
=28V and various external
1500
28V
880
402
500
2200
6800
200
TUNE
1100
1500
TUNE
25V
348
530
and C
10,000
and C
4400
51.1
1320
2200
22V
221
420
TUNE
TUNE
TUNE
15,000
6600
36.5
1320
3300
84.5
19V
according to
370
in order to
and C
16.8V
1540
6800
61.9
317
15,000
TUNE
TUNE
8000
40.2
36 – 75 Vdc Input; 28Vdc Output; 350W Output
JNW350R Power Modules; DC-DC Converters
temperature (T
Figure 15.
Considerations include ambient temperature, airflow,
module power dissipation, and the need for increased
reliability. A reduction in the operating temperature of
the module will result in an increase in reliability. The
thermal data presented here is based on physical
measurements taken in a wind tunnel.
For reliable operation this temperature should not
exceed 100ºC at T
exceed 112ºC at T
convection airflow. The output power of the module
should not exceed the rated power for the module as
listed in the ordering Information table. Although the
maximum T
discussed above, you can limit this temperature to a
lower value for extremely high reliability.
Figure 19.
Location (top view).
Thermal Derating
Thermal derating is presented for two different
applications: 1) Figure 20, the JNW350R module is
thermally coupled to a cold plate inside a sealed
clamshell chassis, without any internal air circulation;
and 2) Figure 21 and 22, the JNW350R module is
mounted in a traditional open chassis or cards with
forced air flow. In application 1, the module is cooled
entirely by conduction of heat from the module
primarily through the top surface to a coldplate, with
some conduction through the module’s pins to the
power layers in the system board. For application 2,
the module is cooled by heat removal into a forced
airflow that passes through the interior of the module
and over the top baseplate and/or attached heatsink.
Case (T
REF
REF
temperature of the power modules is
) occurs at the position indicated in
REF
REF 1
REF 2
) Temperature Measurement
for cold plate applications or
for applications using forced
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