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.

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

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

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.

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

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GAIA

Con

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er G

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08-0

59.1

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Rev

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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