JNCW016A0R Datasheet, PDF (10/15 Pages) Lineage Power Corporation – 36–75 Vdc Input; 28Vdc Output; 16Adc Output

GE
Data Sheet
JNCW016A0R Orca Series; DC-DC Converter Power Modules
36–75 Vdc Input; 28.0Vdc Output; 16Adc Output
Feature Description (continued)
Adding external capacitance however affects the voltage
control loop of the module, typically causing the loop to slow
down with sluggish response. Larger values of external
capacitance could also cause the module to become
unstable.
The Tunable Loop allows the user to externally adjust the
voltage control loop to match the filter network connected
to the output of the module. The Tunable Loop is
implemented by connecting a series R-C between the
SENSE(+) and TRIM pins of the module, as shown in Fig. 17.
This R-C allows the user to externally adjust the voltage loop
feedback compensation of the module.
Figure 17. Circuit diagram showing connection of RTUNE
and CTUNE to tune the control loop of the module.
Table 1 shows the recommended values of RTUNE and CTUNE
for different values of ceramic output capacitors up to
8000uF that might be needed for an application to meet
output ripple and noise requirements.
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 temperature (TREF) occurs at the position
indicated in Figure 18.
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, using automated
thermo-couple instrumentation to monitor key component
temperatures: FETs, diodes, control ICs, magnetic cores,
ceramic capacitors, opto-isolators, and module pwb
conductors, while controlling the ambient airflow rate and
temperature. For a given airflow and ambient temperature,
the module output power is increased, until one (or more) of
the components reaches its maximum derated operating
temperature, as defined in IPC-9592. This procedure is then
repeated for a different airflow or ambient temperature until
a family of module output derating curves is obtained.
Table 1. General recommended values of of RTUNE and
CTUNE for Vout=28V and various external ceramic capacitor
combinations.
Cout(µF)
1100
2200
4400
6600
8800
ESR (mΩ)
60
30
15
10
7.5
RTUNE
*
*
*
*
*
CTUNE
*
*
*
*
*
* contact GE technical support
Please contact your GE 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 JNCW016A0R module provides a non-latching over
temperature protection. A temperature sensor monitors the
operating temperature of the converter. If the reference
temperature, TREF 1, (see Figure 17) exceeds a threshold of
115 ºC (typical), the converter will shut down and disable the
output. When the base plate temperature has decreased by
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.
Heat-dissipating components inside the unit are thermally
coupled to the case. Heat is removed by conduction,
convection, and radiation to the surrounding environment.
For reliable operation this temperature should not
exceed 100ºC at either TREF 1 or TREF 2 for applications using
forced convection airflow or cold plate applications. 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 TREF temperature of the power
modules is discussed above, you can limit this temperature
to a lower value for extremely high reliability.
August 14, 2013
©2012 General Electric Company. All rights reserved.
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