-
Hi-Rel LIMITOR MODULELGDS-300 : up to 300W POWER
• Ultra compact limitor module
• Transient suppressor module 80V
• MIL-STD-704A/D/E/F, EN2282, AIR2021E
• DO160E cat A, B and Z
• Transient suppressor module 100V
• MIL-STD-1275A/B/C/D,
• Power range : up to 300W
• Inrush current limitation
• RoHS process
Gaia Converter FC08-059.10/18 Revision F©
REDEFINING THE SOURCE OF POWER
1- General
Hi-RelGrade
For locations, phone, fax, E-Mail see back cover
2- Product Selection
Input Voltage Range
K
Output
The GAIA Converter limitor LGDS-300 is an ultracompact power
adaptator module designed toallow operation during voltage
transients andspikes, occuring in avionics or military systems.The
LGDS-300 delivers an output voltage adaptedto GAIA Converter DC/DC
modules. This moduleis optimized to provide high power efficiency
upto 99% over the whole power range up to 300W.
The LGDS-300 features 3 modes of operationsas follow:
• Normal operation :Normal operation occurs in between the
per-manent input voltage of the DC/DC converter;The LGDS-300 is
then operating in steadytransparency state.
• Power fail operation :The power fail operation occurs when
theinput bus drops below 9 Vdc low voltagelimit ; an undervoltage
lock-out stops theLGDS-300.
Transient
O : 100V/50ms
• Transient operation :The LGDS-300 clamps input transient upto
80V/100ms or 100V/50ms.
The LGDS-300 series is compliant with the inter-national input
bus standards :
- MIL-STD-704A/D/E/F- AECMA EN2282- GAM-EG13B/AIR2021E- DO160E
cat A, B and Z- MIL-STD-1275A/B/C/D
The design has been carried out withsurface mount components and
is manufacturedin a fully automated process to guarranty
highquality. Every module is tested with a GaïaConverter automated
test equipment. The mo-dules are potted with a bi-component
thermalconductive compound and packaged in a metalliccase to ensure
the module’s integrity undersevere environmental conditions.
4
Transient 80V or 100V Protection ModuleDO-160, MIL-STD-704 &
MIL-STD-1275
Metallic Case
LGDS - 300 - input output option/
Options :
/T : option for -55°C start up operating temperature /S : option
for screening and serialization
-
For locations, phone, fax, E-Mail see back cover
2
LGDS-300 Series
Gaia Converter FC08-059.10/18 Revision F©
4
Hi-RelGrade
0 10 20 30 40 50 60 70 80 90 100
0
5
10
15
20
25
30
35
40
45
Input voltage (Vdc)
outp
ut v
olta
ge (
Vdc
)
Transient operationArea
Normal operationArea
Pow
er f
ail
oper
atio
n ar
ea
3- Modes of Operation
LGDS-300 Transfer Function
Transient Mode(Vout=Vlim)
Power fail Mode(output disabled)
Start-upVin>Vst
OCP
Surge
End of Surge
OTP
OTP : Over Temperature ProtectionOCP : Over Current
Protection
Normal Mode(Vout=Vin-Vdrop)
UVLO
3-1 LGDS-300 Modes of OperationThe LGDS-300-O-K operates with H
input family of GAIAConverter DC/DC Converters.The LGDS-300-O-K
features 3 modes of operations asdescribes in the following state
diagram :
• Normal operation :Normal operation occurs in between 9V and
42V inputvoltage; the module is then operating in
steadytransparency state.
• Power fail operation :When a failure occurs such as an
undervoltage, anover current or an over temperature, the
LGDS-300turns to power fail mode and stops operation untilthe
failure is removed. The LGDS-300 features 3 pro-tection functions :
input undervoltage lockout (UVLO),output over current protection
(OCP) and overtemperature protection (OTP).
• Transient operation :When a surge occurs, the LGDS-300 turns
to transientmode operation. It clamps input transient up to 100Vas
long as 50ms, while the output voltage remainsat 42V.
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For locations, phone, fax, E-Mail see back cover
3
LGDS-300 Series
Gaia Converter FC08-059.10/18 Revision F©
4
Hi-RelGrade
4- Electrical SpecificationsData are valid at +25°C, unless
otherwise specified.
Parameter ConditionsLimit ortypical
Units LGDS-300
Input
Permanent inputvoltage range (Ui)in normal operation
Full temperature rangeFull load
MinimumMaximum
VDCVDC
942
Compliance withstandards voltagetransient limit
Full temperature range
MaximumMaximumMIL-STD-704A/FAECMA EN2282AIR2021EDO160E cat
A/ZMIL-STD-1275A/D
VDC/msVDC/s80V/75ms60V/50ms60V/100ms80V/100ms100V/50ms
100V/50ms48V/1s
CompliantCompliantCompliantCompliantCompliant
Compliance withstandards voltagespike limit*with companionfilter
FGDS series
50 Ohms impedance50 Ohms impedance50 Ohms impedance50 Ohms
impedance15 mJ energy content
MIL-STD-704A/FAECMA EN2282AIR2021EDO160E cat
A/ZMIL-STD-1275A/D
600V/10µs400V/100µs600V/10µs600V/10µs250V/70µs
Compliant*Compliant*Compliant*Compliant*Compliant*
Under voltagelock- out (UVLO)
Turn-on/Turn-off thresholdMinimumMaximum
VDCVDC
79
Start up timeUi nominal 28VFull load
Maximum ms 6
Inrush currentlimitation
Full temperature rangeC=1000µF
Typical A 5
No load inputcurrent
Ui nominal 28VNo load
Maximum mA 10
Output
Nominal voltage innormal operation
Ui < 42VFull load
Maximum / Ui - 150mV
Nominal voltage intransientprotection mode
In transientInput voltage range
MinimumNominalMaximum
VDCVDCVDC
404244
Output voltageslew rate
During start-up time Typical VDC/ms 5
Output currentFull temperature rangeUi min. to max.
Maximum A 20 (or 300W)
Output PowerFull temperature rangeUi min. to max.
Maximum Wsee page 4figure 5
Power dissipation Output current 20A Maximum W 3
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For locations, phone, fax, E-Mail see back cover
4
LGDS-300 Series
Gaia Converter FC08-059.10/18 Revision F©
4
Hi-RelGrade
0 10 20 30 40 50 60 70 80 90 1000
50
100
150
200
250
300
350
Vin (Vdc)
Pout
(W
)
300W max
20A max
Transient operationArea
Permanent operationArea
4- Electrical Characteristics (continued)
Figure 4 : LGDS-300-O-K Start-up Timing
Figure 1 : LGDS-300-O-K Transient Response at 80Vdc(according to
DO-160D/E/F)
Figure 2 : LGDS-300-O-K Transient Response at 100Vdc(according
to MIL-STD-1275D)
Figure 3 : LGDS-300-O-K Output Power versus Input Voltage
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For locations, phone, fax, E-Mail see back cover
5
LGDS-300 Series
Gaia Converter FC08-059.10/18 Revision F©
4
Hi-RelGrade
4- Electrical Characteristics (continued)
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
45.00
50.00
55.00
60.00
65.00
70.00
75.00
0.05 0.1 0.1
5 0.2 0.25 0.3 0.3
5 0.4 0.45 0.5 0.5
5 0.6 0.65 0.7 0.7
5 0.8 0.85 0.9 0.9
5 11.0
5 1.1 1.15 1.2 1.2
5 1.3 1.35 1.4 1.4
5 1.5 1.55 1.6 1.6
5
time (s)
Lim
itor
Dis
sipa
ted
Ener
gy (
J)
MIL-STD1275CMIL-STD1275DDO160E-CATZMILSTD1275A/B
MIL-STD-1275A/B/C/D(100V/50ms)
DO-160E/CATZ worst case 60V / 510ms
MIL-STD-1275D worst case75V / 240ms
MIL-STD-1275C worst case68V / 170ms
LGDS300
42V
300WVIN
MIL-STD-1275A/B worst case85V / 70ms
LGDS-300-O-K Maximum Admissible Energy in Single Pulse
Condition
0.00
25.00
50.00
75.00
100.00
125.00
150.00
175.00
200.00
225.00
250.00
275.00
300.00
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
time (s)
Lim
itor
dis
sipa
ted
ener
gy (
J) 100V/50ms pulses
7 pulses at 1sec intervalaccording MIL-STD-1275C
standard testing
80V/100ms pulses3 pulses at 10 sec interval
according DO-160E standard testing
LGDS-300-O-KMIL-STD-1275C/D Repetitive surge at
worst case energy operation
100V/50ms pulses5 pulses at 1sec interval
according MIL-STD-1275A/B/D
LGDS-300-O-K Maximum Admissible Energy in Repetitive Surge
Condition
The following figures describe the LGDS-300-O-K maximum
admissible energy in compliance with standard requirements
forsingle pulse and repetitive surge conditions.
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For locations, phone, fax, E-Mail see back cover
6
LGDS-300 Series
Gaia Converter FC08-059.10/18 Revision F©
4
Hi-RelGrade
6- Protection Functions
Characteristics Protection Device RecoveryLimit ortypical
Specifications
Output over current protection (OCP)Hiccup circuitry
withauto-recovery
Automaticrecovery
Permanent See section 10
Over temperature protection (OTP)Thermal device withhysteresis
cycle
Automaticrecovery
Nominal 120°C
7- Reliability Data
5- Isolation
Characteristics Conditions Temperature Specifications
Mean Time Between Failure (MTBF)According to MIL-HDBK-217F
Ground fixed (Gf)Case at 40°CCase at 85°C
1 300 000 Hrs425 000 Hrs
Airborne, Inhabited,Cargo (AIC)
Case at 40°CCase at 85°C
675 000 Hrs250 000 Hrs
Mean Time Between Failure (MTBF)According to IEC-62380-TR
Civilian avionics,calculators
Ambient at 55°C100% time on
1 800 000 Hrs
Parameter ConditionsLimit ortypical
Specifications
Electric strength test voltageInput to outputAll pins to
case
/Minimum
No isolation500 VDC / 1 min
Isolation resistance 50 VDC, all pins to case Minimum 100
MOhm
-
For locations, phone, fax, E-Mail see back cover
7
LGDS-300 Series
Gaia Converter FC08-059.10/18 Revision F©
4
Hi-RelGrade
8- Thermal Characteristics
Characteristics Conditions Limit or typical Performances
Operating ambient temperaturerange at full load
Ambient temperature *MinimumMaximum
- 40°C+ 85°C
Operating case temperaturerange at full load
Case temperatureMinimumMaximum
- 40°C+105°C
Storage temperature range Non functionningMinimumMaximum
- 55°C+ 125°C
Thermal resistanceRth case to ambient in free airnatural
convection
Typical 12°C /W
Note * : The upper temperature range depends on configuration,
the user must assure a max. case temperature of + 105°C.
10 30 807060 9020 40 50
25%
75%
50%
100%
Power (W)
Temperature (˚C)
Full load ambient temperature without derating : 75˚C
Maximum case temperature : 105˚C
Natural convection operation area
Additionnal cooling operation area
Maximum storage temperature : 125˚C
The LGDS-300 series operating case temperature at full load must
not exceed 105°C. The maximum ambient temperatureadmissible for the
DC/DC converter corresponding to the maximum operating case
temperature of 105°C depends on theambient airflow, the
mounting/orientation, the cooling features and the power
dissipated.
To calculate a maximum admissible ambient temperature the
following method can be used. Knowing the maximum casetemparature
Tcase = 105°C of the module, the power used Pout and the efficiency
η :
• determine the power dissipated by the module Pdiss that should
be evacuated :Pdiss = Pout(1/ηηηηη - 1)
• determine the maximum ambient temperature :Ta = 105°C - Rth x
Pdiss
where Rth is the thermal resistance from the case to
ambient.
The previous thermal calculation shows two areas of operation
:
• a normal operation area in a free natural ambient convection
(grey area in the following graph),
• an area with cooling features (air flow or heatsink) ensuring
a maximum case temperature below the maximum operating case
temperature of 105°C at full load (white area in the following
graph).
-
For locations, phone, fax, E-Mail see back cover
8
LGDS-300 Series
Gaia Converter FC08-059.10/18 Revision F©
4
Hi-RelGrade
9- Environmental QualificationsThe modules have been subjected
to the following environmental qualifications.
Characteristics Conditions Severity Test procedure
Climatic Qualifications
Life at high
temperature
Duration
Temperature / status of unit
Test D : 1 000 Hrs
@ 105°C case, unit operating@ 125°C ambient, unit not
operating
MIL-STD-202GMethod 108A
Altitude
Altitude level CDurationClimb upStabilizationStatus of unit
40 000 ft@-55°C30 min.1 000 ft/min to 70 000 ft@-55°C,30
min.unit operating
MIL-STD-810EMethod 500.3
Humidity cyclic
Number of cycleCycle durationRelative humidity
variationTemperature variationStatus of unit
10Cycle I : 24 Hrs60 % to 88 %31°C to 41°Cunit not operating
MIL-STD-810EMethod 507.3
Humidity steady
Damp heatTemperatureDurationStatus of unit
93 % relative humidity40°C56 daysunit not operating
MIL-STD-202GMethod 103B
Salt atmosphere
TemperatureConcentration NaClDurationStatus of unit
35°C5 %48 Hrsunit not operating
MIL-STD-810EMethod 509.3
Temperaturecycling
Number of cyclesTemperature changeTransfert timeSteady state
timeStatus of unit
200-40°C / +85°C40 min.20 min.unit operating
MIL-STD-202AMethod 102A
Temperatureshock
Number of shocksTemperature changeTransfert timeSteady state
timeStatus of unit
100-55°C / +105°C10 sec.20 min.unit not operating
MIL-STD-202GMethod 107G
Mechanical Qualifications
Vibration(Sinusoidal)
Number of cyclesFrequency / amplitudeFrequency /
accelerationDurationStatus of unit
10 cycles in each axis10 to 60 Hz / 0.7 mm60 to 2 000 Hz / 10
g2h 30 min. per axisunit not operating
MIL-STD-810DMethod 514.3
Shock(Half sinus)
Number of shocksPeak accelerationDurationShock formStatus of
unit
3 shocks in each axis100 g6 ms1/2 sinusoidalunit not
operating
MIL-STD-810DMethod 516.3
Bump(Half sinus)
Number of bumpsPeak accelerationDurationStatus of unit
2 000 Bumps in each axis40 g6 msunit not operating
MIL-STD-810DMethod 516.3
-
For locations, phone, fax, E-Mail see back cover
9
LGDS-300 Series
Gaia Converter FC08-059.10/18 Revision F©
4
Hi-RelGrade
10- Description of Protections
10-1 Output Over Current Protection (OCP)The LGDS-300 provides a
circuit breaker function that latchesthe output off if the load
current exceeds the current limitthreshold for a duration. The
circuit breaker functionautomatically attempts to restart power
after a load currentfault at a low duty cycle to prevent the
LGDS-300 from
overheating. The over current protection function protectsthe
module against over load of any duration and restoresthe module to
normal operation when the over load isremoved. It operates in
«hiccup» mode by testingperiodically if an overload is applied
(typically every 1srecovery time). The overload detection threshold
is typically30A with a detection time lower than 5ms.
10-2 Inrush Current LimitationThe inrush current limitation
function operates by limitingthe output voltage ramp up. It is
internally set at 5V/mstypically. The inrush current is calculated
as follow.
I inrush= C out×dV out
dt where :
• Cout
is the capacitor value connected to the output
• dV out
dt = 5V/ms
By adding a capacitor connected across the pins «Drive»
&«Gi», and in order to reduce the inrush current the valuedV
out
dt
can be adjusted as follow :
10-3 Over Temperature Protection (OTP)A thermal protection
device adjusted at 120°C (+/-5%)internal temperature with a 10°C
hysteresis cycle will inhibitthe module as long as the overheat is
present and restoresto normal operation automatically when overheat
isremoved.
The LGDS-300 includes 3 types of protection devices.
time
recovery time
detection time
recovery time
x
100
Vo (%)
Temperature
On
120˚c
Off10˚c
COUT
CDRIVEVOUT
LGDS-300
+Vo
Drive
VI
Gi
123
789
4
5
CDRIVE
is given in nFdVout = 50 V/ms dt 10 + C
DRIVE
-
For locations, phone, fax, E-Mail see back cover
10
LGDS-300 Series
Gaia Converter FC08-059.10/18 Revision F©
4
Hi-RelGrade
11- Application Notes
11-1 Reverse Polarity Compatibility
The LGDS-300 has been designed to be compliant with reverse
polarity requirements. The reverse polarity protection canbe
externally achieved either by a standard solution using a schottky
diode or either a low losses solution using a Nchannel power
MOSFET. The following figures are showing both solutions.
LGDS-300
+Vo
Drive
VI
Gi
123
789
4
5
11-2 Drive Function
The LGDS-300 features a drive function used to adjust the inrush
current limit during start-up phase and to achieve a lowloss
reverse polarity protection.
Parameter Unit Min. Typ. Max. Notes, conditions
Drive voltage Vdc Vo-0.6 / Vo+12
Drive current
source
sink
µA
µA
50
-1000
/
/
100
0 Must be externally limited
LGDS-300
+Vo
Drive
VI
Gi
123
789
4
5
11-5 Typical Architecture Schematics Using LGDS-300 with
Multiple Modules
The LGDS-300 is compliant for use with several DC/DC GAIA
converter modules in various configurations.To meet
MIL-STD-461D/E/F, DO-160D/E/F requirements, GAIA Converter
recommends the use of ready-to-use EMI filtertogether with it’s
R*C* cell (see EMI filter datasheet for details).For stability
purpose GAIA Converter recommends the use of a 220µF/50V capacitor
after the LGDS-300.
EMI input filterFGDS-10A-50V
Go
+Vo
GI
VI
MGDM-series
Go
+Vo
GI
VI
MGDM-series
Go
+Vo
GI
VI
MGDM-series
EMI input filterFGDS-10A-50V
LGDS-300
VoVo Vi
Gi
123
789
5
Vi
Gi Go
GndGnd
220µF/50V
Vi
Gi
Vo
Go
C*
R*
Note : such design with joint EMI filter is incompatible with
reverse polarity compatibility. In such case place the second
EMIfilter after LGDS-300.
-
For locations, phone, fax, E-Mail see back cover
11
LGDS-300 Series
Gaia Converter FC08-059.10/18 Revision F©
4
Hi-RelGrade
12- DimensionsDimension are given in mm. Tolerance : +/- 0,2 mm
unless otherwise indicated.Weight : 35 grams (1.22 Ozs) max.
15- Connections
Pin LGDS-300
1,2,3 +Input (Vin)
4 Drive
5 Common (Gin)
6 Not connected
7,8,9 Output (Vo)
3
2
1
7
8
9
4 5 6
Bottom view
13- Materials
Case : Metallic black anodized coating.Pins : Plated with pure
matte tin over nickel underplate.
14- Product Marking
Upper face : Company logo.Side face : Module reference, option,
date code : year and week of manufacturing.
-
Information given in this datasheet is believed to be accurate
and reliable. However, no responsibility is assumed for the
consequence of its use nor for any infringement of patents or other
rights of third parties which may result from its use.These
products are sold only according to GAIA Converter general
conditions of sale, unless otherwise confirmed by writing.
Specifications subject to change without notice.
Prin
ted
in F
ranc
e by
GAIA
Con
vert
er G
aia
Conv
erte
r FC
08-0
59.1
0/18
Rev
isio
n F.
Gra
phis
me
: Ph
ilipp
e Cl
icq
Represented by :
For more detailed specifications and applications information,
contact :
International HeadquartersGAÏA Converter - France
ZI de la Morandière33185 LE HAILLAN - FRANCETel. : +
(33)-5-57-92-12-80Fax : + (33)-5-57-92-12-89
North American HeadquartersGAÏA Converter Canada, Inc4038 Le
Corbusier BlvdLAVAL, QUEBEC - CANADA H7L 5R2Tel. :
(514)-333-3169Fax : (514)-333-4519