Data Sheet
August 9, 2010
JNC350R Series Power Modules; DC-DC Converters
18-36 Vdc Input; 28Vdc Output; 350W Output
* UL is a registered trademark of Underwriters Laboratories, Inc.
† CSA is a registered trademark of Canadian Standards Association.
‡ VDE is a trademark of Verband Deutscher Elektrotechniker e.V.
** ISO is a registered trademark of the International Organization of Standards
Document No: DS10-002 ver 1.01
PDF name: JNC350R.pdf
:
Features
Compliant to RoHS EU Directive 2002/95/EC (-Z
versions)
Compliant to ROHS EU Directive 2002/95/EC with
lead solder exemption (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
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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 Lineage Power 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.
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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% peak 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.
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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 ver sus Outp u t
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 J NC350R Transie nt Res ponse 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
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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 Effici ency Te s t
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.
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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.
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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)
Upper Trim Limit
Lower Trim 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, Standa rd 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, Standa rd JNC350R.
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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 opt ion.
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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 Lineage Power
technical representative to obtain more details on the
selection for this resistor.
Figure 17. Circuit Configu rati on t o Ac tiv el y Adju s t
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 connec tion 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
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 11
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
V(mV) 340 320 280 280 260 290
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 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 Measurem ent
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 Lineage Power
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.
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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 Lineage Power Board
Mounted Power Modules: Soldering a nd 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 Lineage
Power representative for more details.
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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 consideratio n s .
For further information on designing for EMC compliance, please refer to the FLTR100V20 data sheet (FDS01-
077EPS).
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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 (+)
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
LINEAGE POWER 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]
Data Sheet
August 9, 2010 JNC350R Power Modules; DC-DC Converters
18 – 36 Vdc Input; 28Vdc Output; 350W Output
Document No: DS10-002 ver 1.01
PDF name: JNC350R.pdf
Ordering Information
Please contact your Lineage Power 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
World Wide Headquarters
Lineage Power Corporation
601 Shiloh Road, Plano, TX 75074, USA
+1-800-526-7819
(Outside U.S.A.: +1-972-244-9428)
www.lineagepower.com
e-mail: techsupport1@lineagepower.com
Asia-Pacific Headquarters
Tel: +65 6593 7211
Europe, Middle-East and Af ric a Headquarters
Tel: +49 89 878067-280
India He ad quart er s
Tel: +91 80 28411633
Lineage Power reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or
a
pplication. No rights under any patent accompany the sale of any such product(s) or information.
Lineage Power DC-DC products are protected under various patents. Information on these patents is available at www.lineagepower.com/patents.
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2009 Linea
g
e Power Cor
p
oration
,
(
Plano
,
Texas
)
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hts Reserved.
