GE Data Sheet
October 5, 2015 ©2012 General Electric Company. All rights reserved.
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
Features
Compliant to RoHS EU Directive 2011/65/EU (Z versions)
Compliant to RoHS EU Directive 2011/65/EU under
exemption 7b (Lead solder exemption). Exemption 7b
will expire after June 1, 2016 at which time this produc
twill no longer be RoHS compliant (non-Z versions)
Compliant to IPC-9592, Class II, Category 2
High power density: 129 W/in3
Industry standard half-brick pin-out
Industry standard half-brick footprint
57.7mm x 60.7mm x 12.7mm
(2.27” x 2.39” x 0.5”)
2:1 input voltage range
Low output ripple and noise
Constant switching frequency
Single tightly regulated output
No minimum load required
Remote Sense
Output voltage adjustment trim, 16.8Vdc to 32.0Vdc
Accepts transient overloads without shutdown
Latch after output OVP/OCP fault shutdown
Over temperature protection auto restart
Wide operating case temperature range (-40°C to
100°C)
CE mark meets 2006/95/EC directives§
UL60950-1/CSA† C22.2 No. 60950-1-03 Certified
(CCSAUS) and VDE‡ 0805:2001-12 (EN60950-1) Licensed
ISO** 9001 and ISO 14001 certified manufacturing
facilities
Applications
RF Power Amplifier
Wireless Networks
Switching Networks
Options
Auto-restart after either output OCP or OVP fault
shutdown (“3” option code)
Auto-restart only after output OCP fault
shutdown (“4” option code)
Shorter pins (“6” or “8” option code)
Unthreaded heatsink holes (-18 option code)
Tunable Loop™ for transient response
optimization (-T option code)
Description
The JNC350R series of dc-dc converters are a new generation of isolated DC/DC power modules providing up to 350W
output power in an industry standard half-brick size footprint, which makes it an ideal choice for high voltage and high
power applications. Threaded-through holes are provided to allow easy mounting or addition of a heat sink for high-
temperature applications. The output is fully isolated from the input, allowing versatile polarity configurations and
grounding connections. This module contains an optional new feature, the Tunable LoopTM, which allows the user to
optimize the dynamic response of the converter to match the load with reduced amount of output capacitance, leading to
savings on cost and PWB area.
RoHS Compliant
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 2
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute
stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those
given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can
adversely affect the device reliability.
Parameter Device Symbol Min Max Unit
Input Voltage
Continuous All VIN -0.3 40 Vdc
Transient, operational (100 ms) All VIN,trans -0.3 50 Vdc
Operating Ambient Temperature
Please contact your GE Sales representative for information
on thermal derating when using forced airflow.
All Ta -40 85 °C
Operating Case Temperature
(See Thermal Considerations section, Figure 20)
All Tc -40 100 °C
Storage Temperature All Tstg -55 125 °C
I/O Isolation Voltage: Input to Case, Input to Output All 1500 Vdc
Output to Case All 500 Vdc
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
Parameter Device Symbol Min Typ Max Unit
Operating Input Voltage
(see Figure 12 for VIN, min when using trim-up feature) All VIN 18 24 36 Vdc
Maximum Input Current All IIN,max
25 Adc
(VIN=18V to 36V, IO=IO, max)
Inrush Transient All I2t 2 A2s
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 12H source impedance; VIN=0V to 36V, IO=
IOmax ; see Figure 7)
All 25 mAp-p
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple standalone operation to being an
integrated part of complex power architecture. To preserve maximum flexibility, internal fusing is not included. Always use
an input line fuse, to achieve maximum safety and system protection. The safety agencies require a fast-acting fuse with a
maximum rating of 30 A (see Safety Considerations section). Based on the information provided in this data sheet on inrush
energy and maximum dc input current, the same type of fuse with a lower rating can be used. Refer to the fuse
manufacturer’s data sheet for further information.
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 3
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set-point
(VIN=VIN,nom, IO=IO, max, Tc =25°C)
All
VO, set 27.5 28 28.5 Vdc
Output Voltage1
(Over all operating input voltage, resistive load, and
temperature conditions until end of life)
All
VO 27.15 28.85 Vdc
Output Regulation
Line (VIN=VIN, min to VIN, max) All
0.1 0.2 %Vo,set
Load (IO=IO, min to IO, max)1 All
0.1 0.2 %Vo,set
Temperature (Tc = -40ºC to +100ºC) All 0.5 1.5 %Vo,set
Output Ripple and Noise on nominal output
(VIN=VIN, nom and IO=IO, min to IO, max)
RMS (5Hz to 20MHz bandwidth) All 45 55 mVrms
Peak-to-Peak (5Hz to 20MHz bandwidth)2 All 80 200 mVpk-pk
External Capacitance (ESR > 50 m)3 All, except -
T CO 440 6500 F
Without the Tunable Loop™ (ESRMAX = 80m)3 -T CO 440 470 F
With the Tunable Loop™ (ESR > 50 m)4 -T CO 440 8,000 F
Output Current2 All Io 0 12.5 Adc
Output Current Limit Inception All IO, lim 13.1 17.5 Adc
Output Short Circuit Current (VO 0.25Vdc) All IO, sc 30 Arms
Efficiency
VIN=VIN, nom, Tc=25°C IO=IO, max , VO= VO,set All 91 %
Switching Frequency fsw 300 kHz
Dynamic Load Response
(Io/t=1A/10s; Vin=Vin,nom; Tc=25°C; Tested with
a 470 F aluminum and a 10 µF ceramic
capacitor across the load.)
Load Change from Io= 50% to 75% of Io,max:
Peak Deviation
Settling Time (Vo<10% peak deviation)
All Vpk
ts
2
1.5
%VO, set
ms
Load Change from Io= 25% to 50% of Io,max:
Peak Deviation
Settlin
g
Time (Vo<10%
p
eak deviation)
Vpk
ts
2
1.5
%VO, set
ms
1. For Vin 19V, and case temperatures 85°C, output voltage regulation is relaxed to -2.5%Vo,set.
2. When operating at output current between 0Adc and 1Adc, output ripple may exceed maximum pk-pk limits.
3. Use a minimum 2 x 220uF output capacitor. Recommended capacitor is Nichicon CD series, 220uF/35V. If the ambient temperature is
less than 0°C, use 3x of the minimum CO.
4. External capacitors may require using the new Tunable Loop™ feature to ensure that the module is stable as well as getting the best
transient response. See the Tunable Loop™ section for details.
Isolation Specifications
Parameter Symbol Min Typ Max Unit
Isolation Capacitance Ciso 15 nF
Isolation Resistance Riso 10 M
General Specifications
Parameter Device Symbol Min Typ Max Unit
Calculated Reliability based upon Telcordia SR-332
Issue 2: Method I Case 3 (IO=80%IO, max, TA=40°C,
airflow = 200 lfm, 90% confidence)
All
FIT 341.8 109/Hours
MTBF 2,925,365 Hours
Weight All
78 g
2.8 oz.
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 4
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
See Feature Descriptions for additional information.
Parameter Device Symbol Min Typ Max Unit
Remote On/Off Signal Interface
(VIN=VIN, min to VIN, max ; open collector or equivalent,
Signal referenced to VIN- terminal)
Negative Logic: device code suffix “1”
Logic Low = module On, Logic High = module Off
Positive Logic: No device code suffix required
Logic Low = module Off, Logic High = module On
Logic Low - Remote On/Off Current All Ion/off 1.0 mA
Logic Low - On/Off Voltage All Von/off 0 1.2 Vdc
Logic High Voltage – (Typ = Open Collector) All Von/off 5 Vdc
Logic High maximum allowable leakage current All Ion/off 50 A
Turn-On Delay and Rise Times
(Vin=Vin,nom, IO=IO, max, Tc=25C)
Case 1: Tdelay = Time until VO = 10% of VO,set from
application of Vin with Remote On/Off set to ON,
All Tdelay 85 ms
Case 2: Tdelay = Time until VO = 10% of VO,set from
application of Remote On/Off from Off to On with Vin
already applied for at least one second.
All Tdelay 25 30 ms
Trise = time for VO to rise from 10% of VO,set to 90% of
VO,set. All Trise 25 ms
Output Voltage Overshoot 3 % VO, set
(IO=80% of IO, max, Tc =25°C)
Output Voltage Adjustment
(See Feature Descriptions):
Output Voltage Remote-sense Range
(only for No Trim or Trim down application ) All Vsense __
__
2 %Vo,nom
Output Voltage Set-point Adjustment Range (trim) All Vtrim 16.8
__
32.0 Vdc
Output Overvoltage Protection All VO, limit 34 38 Vdc
Over Temperature Protection
All Tref 110 °C
(See Feature Descriptions)
Input Under Voltage Lockout VIN, UVLO
Turn-on Threshold All 17 18 Vdc
Turn-off Threshold All 15 16 Vdc
Hysteresis All 1.5 Vdc
Input Over voltage Lockout VIN, OVLO
Turn-on Threshold All 39 41 Vdc
Turn-off Threshold All 41 42 Vdc
Hysteresis All --- 2 --- Vdc
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 5
Characteristic Curves
The following figures provide typical characteristics for the JNC350R (28V, 12.5A) at 25ºC. The figures are identical for either
positive or negative Remote On/Off logic.
EFFICIENCY (%)
70
75
80
85
90
95
0 2.5 5 7.5 10 12.5
Vin=18V
Vin=24V
Vin=36V
O
n
/Off
V
O
LTA
G
E
O
UTPUTV
O
LTA
G
E
VON/OFF(V) (2V/div) VO (V) (10V/div)
OUTPUT CURRENT, Io (A) TIME, t (20ms/div)
Figure 1. Converter Efficiency versus Output Current.
Figure 4. Typical Start-Up Using negative Remote On/Off;
Co,ext = 470µF.
OUTPUT VOLTAGE
VO (V) (50mV/div)
INPUT VOLTAGE OUTPUT VOLTAGE
Vin (V) (10V/div) VO(V) (10V/div)
TIME, t (1s/div) TIME, t (20ms/div)
Figure 2. Typical Output Ripple and Noise at Room
Temperature and 24Vin; Io = Io,max; Co,ext = 470µF.
Figure 5. Typical Start-Up from VIN, on/off enabled prior to
VIN step; Co,ext = 470µF.
OUTPUT CURRENT OUTPUT VOLTAGE
IO (A) (5A/div) VO(V) (200mV/div)
OUTPUT CURRENT OUTPUT VOLTAGE
IO (A) (5A/div) VO(V) (200mV/div)
TIME, t (1ms/div) TIME, t (1ms/div)
Figure 3. Standard JNC350R Transient Response to
Dynamic Load Change from 25% to 50% to 25% of Full
Load at Room Temperature and 24 Vdc Input; 0.1A/uS,
Co,ext = 470µF
Figure 6. Standard JNC350R Transient Response to
Dynamic Load Change from 50% to 75% to 50% of Full
Load at Room Temperature and 24 Vdc Input; 0.1A/uS,
Co,ext = 470µF
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 6
Test Configurations
Note: Measure the input reflected-ripple current with a
simulated source inductance (LTEST) of 12 µH. Capacitor CS
offsets possible battery impedance. Measure the current, as
shown above.
Figure 7. Input Reflected Ripple Current Test Setup.
Note: Use a Cout (470 µF Low ESR aluminum or tantalum
capacitor typical), a 0.1 µF ceramic capacitor and a 10 µF
ceramic capacitor, and Scope measurement should be made
using a BNC socket. Position the load between 51 mm and 76
mm (2 in. and 3 in.) from the module.
Figure 8. Output Ripple and Noise Test Setup.
Note: All measurements are taken at the module terminals.
When socketing, place Kelvin connections at module terminals
to avoid measurement errors due to socket contact resistance.
Figure 9. Output Voltage and Efficiency Test Setup.
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance source. A highly inductive source
impedance can affect the stability of the power module.
For the test configuration in Figure 7, a 470F Low ESR
aluminum capacitor, CIN , mounted close to the power
module helps ensure the stability of the unit. Consult the
factory for further application guidelines
Output Capacitance
The JNC350R power module requires a minimum output
capacitance of 440µF Low ESR aluminum capacitor, Cout
to ensure stable operation over the full range of load and
line conditions, see Figure 8. If the ambient temperature
is under -20C, it is required to use at least 3 pcs of
minimum capacitors in parallel. In general, the process
of determining the acceptable values of output
capacitance and ESR is complex and is load-dependant.
Safety Considerations
For safety-agency approval of the system in which the
power module is used, the power module must be
installed in compliance with the spacing and separation
requirements of the end-use safety agency standard, i.e.,
UL60950-1, CSA C22.2 No. 60950-1-03, EN60950-1 and
VDE 0805:2001-12.
For all input voltages, other than DC MAINS, where the
input voltage is less than 60V dc, if the input meets all of
the requirements for SELV, then:
The output may be considered SELV. Output
voltages will remain within SELV limits even with
internally-generated non-SELV voltages. Single
component failure and fault tests were performed
in the power converters.
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. However, SELV will
not be maintained if VI(+) and VO(+) are grounded
simultaneously.
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 30 A fast-acting or fuse in the unearthed
lead.
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 7
Feature Description
Remote On/Off
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.
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.
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 50A.
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(-).
Figure 10. Circuit configuration for using Remote
On/Off Implementation.
Over-Current Protection (OCP)
To provide protection in a fault output overload
condition, the module is equipped with internal current
limiting protection circuitry, and can endure over-current
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.
A latching shutdown option is standard. If over-current
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.
An OCP auto-restart option (code = 3 or 4, see Table 2) is
also available in a case where an auto recovery is
required. If over-current 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
over-current condition is corrected.
Over-Voltage Protection (OVP)
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 protection
mechanism is such that the unit can continue in this
condition until the fault is cleared.
An OVP auto-restart option (code = 3, see Table 2) is also
available in a case where an auto recovery is required.
Once the module has shutdown, after a period of
approximately 4.5 seconds, the module will restart. If the
output overload condition still exists when the module
restarts, it will shut down again. This operation will
continue indefinitely, until the over-current condition is
corrected.
Remote sense
Remote sense minimizes the effects of distribution losses
by regulating the voltage at the remote-sense
connection (see Figure 11). For No Trim or Trim down
application, the voltage between the remote-sense pin
and the output terminal must not exceed the output
voltage sense range given in the Feature Specifications
table i.e.: SENSE(+)–Vo(+) 2% Vo,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 11. Do not connect SENSE(-)
to the Vo(-) or Rload(-) as there is a 0 connection
internal to the module. If not using the remote-sense
feature to regulate the output at the point of load, then
connect SENSE(+) to Vo(+).
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.
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 8
Feature Description (continued)
Figure 11. Effective Circuit Configuration for Single-
Module Remote-Sense Operation Output Voltage.
Output Voltage Programming
Trimming allows the user to increase or decrease the
output voltage set point of a module. The trim resistor
should be positioned close to the module. Certain
restrictions apply to the input voltage lower limit when
trimming the output voltage to the maximum. See Figure
12 for the allowed input to output range when using
trim. If not using the trim down feature, leave the TRIM
pin open.
14
16
18
20
22
24
26
28
30
32
34
16 18 20 22 24 26 28 30 32 34 36 38
V
o
u
t
(
V
)
Vin (V)
Uppe r Tr im Limit
Lower Tr im Limit
Figure 12. Output voltage trim limits vs. Input Voltage.
Modules without the –T Option
Trim Down – Decrease Output Voltage
Trimming down is accomplished by connecting an
external resistor between the TRIM pin and the SENSE(-)
pin. With an external resistor (Radj-down) between the TRIM
and SENSE(-) pins, the output voltage set point (Vo,adj)
decreases (see Figure 13). The following equation
determines the required external-resistor value to obtain
a percentage output voltage change of %.
For output voltages: 28V
kR downadj 2
%
100
Where,
100% ,
,
nomo
desirednomo
VVV
Vdesired = Desired output voltage set point (V).
Figure 13. Circuit Configuration to Decrease Output
Voltage, Standard JNC350R.
Trim Up – Increase Output Voltage
Trimming up is accomplished by connecting external
resistor between the SENSE(+) pin and TRIM pin.With an
external resistor (Radj-up) connected between the
SENSE(+) and TRIM pins, the output voltage set point
(Vo,adj) increases (see Figure 14).
The following equation determines the required external-
resistor value to obtain a percentage output voltage
change of %.
For output voltages: 28V
k
V
RnomO
upadj %%)2(100(
%225.1
%)100(
,
Where,
100% ,
,
nomo
nomodesired
VVV
Vdesired = Desired output voltage set point (V).
Figure 14. Circuit Configuration to Increase Output
Voltage, Standard JNC350R.
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 9
Feature Description (continued)
Examples:
To trim down the output of a nominal 28V module to
16.8V
100
28 8.1628
%
VVV
% = 40
kR downadj 2
40
100
Radj - down = 0.5 k
To trim up the output of a nominal 28V module to 30.8V
100
28 288.30
%
VVV
% = 10
kR upadj 10 )102(100(
10225.1 )10100(28
Radj - up = 239.4 k
Modules with the –T Option
Trim Down – Decrease Output Voltage
With an external resistor (Radj-down) between the TRIM and
SENSE(+) pins, the output voltage set point (Vo,adj)
decreases (see Figure 15). The following equation
determines the required external-resistor value to obtain
a percentage output voltage change of %.
For output voltages: 28V
kR downadj 2.111
%45.10631
Where,
100% ,
,
nomo
desirednomo
VVV
Vdesired = Desired output voltage set point (V).
Figure 15. Circuit Configuration to Decrease Output
Voltage, JNC350R-T option.
Trim Up – Increase Output Voltage
With an external resistor (Radj-up) connected between the
SENSE(-) and TRIM pins, the output voltage set point
(Vo,adj) increases (see Figure 16).
The following equation determines the required external-
resistor value to obtain a percentage output voltage
change of %.
For output voltages: 28V
kR upadj %5.488
Where,
100% ,
,
nomo
nomodesired
VVV
Vdesired = Desired output voltage set point (V).
Figure 16. Circuit Configuration to Increase Output
Voltage, JNC350Rx-T option.
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 10
Feature Description (continued)
Examples:
To trim down the output of a nominal 28V JNC350-T
module to 16.8V
100
28 8.1628
%
VVV
% = 40
kR downadj 2.111
40 45.10631
Radj - down = 154.5 k
To trim up the output of a nominal 28V JNC350-T
module to 30.8V
100
28 288.30
%
VVV
% = 10
kR upadj 10 5.488
Radj - up = 48.8 k
Active Voltage Programming
For both the JNC350Rx and JNC350Rx-T, a Digital-
Analog converter (DAC), capable of both sourcing and
sinking current, can be used to actively set the output
voltage, as shown in Figure 17. The value of RG will be
dependent on the voltage step and range of the DAC
and the desired values for trim-up and trim-down %.
Please contact your GE technical representative to
obtain more details on the selection for this resistor.
Figure 17. Circuit Configuration to Actively Adjust the
Output Voltage.
Tunable Loop™
The JNC350Rx-T modules have a new feature that
optimizes transient response of the module called
Tunable Loop™.
External capacitors are usually added to the output of
the module for two reasons: to reduce output ripple and
noise and to reduce output voltage deviations from the
steady-state value in the presence of dynamic load
current changes. 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 LoopTM allows the user to externally adjust
the voltage control loop to match the filter network
connected to the output of the module. The Tunable
LoopTM is implemented by connecting a series R-C
between the SENSE(+) and TRIM pins of the module, as
shown in Figure 18. This R-C allows the user to externally
adjust the voltage loop feedback compensation of the
module.
Figure 18. Circuit diagram showing connection of RTUNE
and CTUNE to tune the control loop of the module.
Recommended values of RTUNE and CTUNE for different
output capacitor combinations are given in Tables 1 and
2. Table 1 shows the recommended values of RTUNE and
CTUNE for different values of ceramic output capacitors
up to 8000F that might be needed for an application to
meet output ripple and noise requirements. Selecting
RTUNE and CTUNE according to 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 RTUNE and CTUNE in order to 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 24V.
Table 1. General recommended values of of RTUNE and
CTUNE for Vout=28V and various external ceramic
capacitor combinations.
Cout(µF) 1320 2200 4400 6600 8000
RTUNE(k 1000 100 36.5 36.5 36.5
CTUNE(pF) 470 6800 10000 10000
10000
Table 2. Recommended values of RTUNE and CTUNE to
obtain transient deviation of 2% of Vout for a 6A step
load with Vin=24V.
Vo
32V
28V
25V 22V 19V
16.8V
Co(uF)
1320
1320
1320 1320 1320
1540
RTUNE(k
1000
301 301 301 301 301
CTUNE(pF)
470 1500
1500 2200 3300
6800
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 11
V(mV) 340 320 280 280 260 290
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 JNC350R 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 110ºC
(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.
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.
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 19.
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 TREF for cold plate. 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.
Figure 19. Case (TREF ) Temperature Measurement
Location (top view).
Thermal Derating
The thermal derating presented in Figure 20 has the
JNC350R module thermally coupled to a cold plate inside
a sealed clamshell chassis, without any internal air
circulation. Please contact your GE sales representative
for information regarding applications where 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.
250
275
300
325
350
375
20 30 40 50 60 70 80 90 100
Baseplate Temperature (C)
Output Power (W)
Figure 20. Output Power Derating for JNC350R in
Conduction cooling (cold plate) applications; Ta
<70ºC in vicinity of module interior; VIN = 24V.
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 12
Layout Considerations
The JNC350R power module series are aluminum base
board packaged style, as such; component clearance
between the bottom of the power module and the
mounting (Host) board is limited. Avoid placing copper
areas on the outer layer directly underneath the power
module.
Post Solder Cleaning and Drying Considerations
Post solder cleaning is usually the final circuit-board
assembly process prior to electrical board testing. The
result of inadequate cleaning and drying can affect both
the reliability of a power module and the testability of
the finished circuit-board assembly. For guidance on
appropriate soldering, cleaning and drying procedures,
refer to GE Board Mounted Power Modules: Soldering and
Cleaning Application Note.
Through-Hole Lead-Free Soldering
Information
The RoHS-compliant through-hole products use the SAC
(Sn/Ag/Cu) Pb-free solder and RoHS-compliant
components. They are designed to be processed
through single or dual wave soldering machines. The
pins have an RoHS-compliant finish that is compatible
with both Pb and Pb-free wave soldering processes. A
maximum preheat rate of 3C/s is suggested. The wave
preheat process should be such that the temperature of
the power module board is kept below 210C. For Pb
solder, the recommended pot temperature is 260C,
while the Pb-free solder pot is 270C max. Not all RoHS-
compliant through-hole products can be processed with
paste-through-hole Pb or Pb-free reflow process. Before
attempting this soldering process, please consult with
your GE representative for more details.
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 13
EMC Considerations
The filter circuit schematic and plots in Figure 21 shows a suggested configuration as tested to meet the conducted
emission limits of EN55022 Class B.
Note: Customer is ultimately responsible for the proper selection, component rating and verification of the suggested parts
based on the end application.
Symbol Component Description
C1 – C5 SMD Ceramic Capacitor: 1000nF/100V/X7R/1210
C6 SMD Ceramic Capacitor : 100nF/100V/X7R/1206
L1, L2 CM inductor-single phase: 473uH-14A-R5K-1*25.4*12.7mm
C8 – C11 SMD Ceramic Capacitor: 0.22uF/630V/X7R/2220, meet 1kV endure voltage requirement.
C7 Electrolytic capacitor: 470uF, 100V
C12 Electrolytic capacitor: 470uF, 35V
L3 CM inductor-single phase core: 17uH- R7K-25*15*12; winding: 5TS
Vin+: Vin-:
Figure 21. EMC considerations.
For further information on designing for EMC compliance, please refer to the FLTR100V20 data sheet (FDS01-077EPS).
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 14
Mechanical Outline for Through-Hole Module
Dimensions are in inches and [millimeters].
Tolerances: x.xx in. 0.02 in. [x.x mm 0.5 mm] (Unless otherwise indicated)
x.xxx in 0.010 in. [x.xx mm 0.25 mm]
TOP VIEW
SIDE VIEW
BOTTOM
VIEW
Pin Description Pin
Description
Pin
Description
1 Vin (+) 4 Vin (–) 7 Trim
2 On/Off 5 Vout (–) 8 Sense (+)
3 Baseplate 6 Sense (-) 9 Vout (+)
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
October 5, 2015 ©2012 General Electric Company. All rights reserved. Page 15
Recommended Pad Layout for Through Hole Module
Dimensions are in inches and [millimeters].
Tolerances: x.xx in. 0.02 in. [x.x mm 0.5 mm] (Unless otherwise indicated)
x.xxx in 0.010 in. [x.xx mm 0.25 mm]
GE Data Sheet
JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
Contact Us
For more information, call us at
USA/Canada:
+1 877 546 3243, or +1 972 244 9288
Asia-Pacific:
+86.021.54279977*808
Europe, Middle-East and Africa:
+49.89.878067-280
www.gecriticalpower.com
GE Critical Power reserves the right to make changes to the product(s) or information contained herein without notice, and no
liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such
product(s) or information.
October 5, 2015 ©2012 General Electric Company. All International rights reserved. Version 1.02
Ordering Information
Please contact your GE Sales Representative for pricing, availability and optional features.
Table 1. Device Code
Input Voltage Output
Voltage
Output
Current Efficiency Connector
Type Product codes Comcodes
24V (18-36Vdc) 28V 12.5A 91% Through hole JNC350R41Z CC109154927
24V (18-36Vdc) 28V 12.5A 91% Through hole JNC350R641-18Z CC109161262
24V (18-36Vdc) 28V 12.5A 91% Through hole JNC350R41-TZ CC109158457
Table 2. Device Options
