LGDS-300-O-K/S - GAIA Converter

Hi-Rel LIMITOR MODULE

LGDS-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 FC08-059.01/10 Revision D

REDEFINING THE SOURCE OF POWER

1- General

Hi-Rel

Grade

For locations, phone, fax, E-Mail see back cover

2- Product Selection

Input Voltage Range

Output

The GAIA Converter limitor LGDS-300 is an ultra

compact power adaptator module designed to

allow operation during voltage transients and

spikes, occuring in avionics or military systems.

The LGDS-300 delivers an output voltage adapted

to GAIA Converter DC/DC modules. This module

is optimized to provide high power efficiency up

to 99% over the whole power range up to 300W.

The LGDS-300 features 3 modes of operations

as 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 steady

transparency state.

• Power fail operation :

The power fail operation occurs when the

input bus drops below 9 Vdc low voltage

limit ; an undervoltage lock-out stops the

LGDS-300.

Transient

O : 100V/50ms

• Transient operation :

The LGDS-300 clamps input transient up

to 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 with

surface mount components and is manufactured

in a fully automated process to guarranty high

quality. Every module is tested with a Gaïa

Converter automated test equipment. The mo-

dules are potted with a bi-component thermal

conductive compound and packaged in a metallic

case to ensure the module’s integrity under

severe environmental conditions.

80V or 100V Transient Protection Module

MIL-STD-704A & 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

LGDS-300 Series

Gaia Converter FC08-059.01/10 Revision D

Hi-Rel

Grade

0 10 20 30 40 50 60 70 80 90 100

Input voltage (Vdc)

output voltage (Vdc)

Transient operation

Area

Normal operation

Area

Power fail

operation area

3- Modes of Operation

LGDS-300 Transfer Function

Transient Mode

(Vout=Vlim)

Power fail Mode

(output disabled)

Start-up

Vin>Vst

OCP

Surge

End of

Surge

OTP

OTP : Over Temperature Protection

OCP : Over Current Protection

Normal Mode

(Vout=Vin-Vdrop)

UVLO

3-1 LGDS-300 Modes of Operation

The LGDS-300-O-K operates with H input family of GAIA

Converter DC/DC Converters.

The LGDS-300-O-K features 3 modes of operations as

describes in the following state diagram :

• Normal operation :

Normal operation occurs in between 9V and 42V input

voltage; the module is then operating in steady

transparency state.

• Power fail operation :

When a failure occurs such as an undervoltage, an

over current or an over temperature, the LGDS-300

turns to power fail mode and stops operation until

the failure is removed. The LGDS-300 features 3 pro-

tection functions : input undervoltage lockout (UVLO),

output over current protection (OCP) and over

temperature protection (OTP).

• Transient operation :

When a surge occurs, the LGDS-300 turns to transient

mode operation. It clamps input transient up to 100V

as long as 50ms.

During this transient mode, the over current protec-

tion (OCP) is activated in order to prevent applica-

tions failure.

For locations, phone, fax, E-Mail see back cover

LGDS-300 Series

Gaia Converter FC08-059.01/10 Revision D

Hi-Rel

Grade

4- Electrical Specifications

Data are valid at +25°C, unless otherwise specified.

Parameter Conditions Limit or

typical Units LGDS-300

Input

Permanent input

voltage range (Ui)

in normal operation

Full temperature range

Full load

Minimum

Maximum

VDC

Compliance with

standards voltage

transient limit

Full temperature range

Maximum

MIL-STD-704A/F

AECMA EN2282

AIR2021E

DO160E cat A/Z

MIL-STD-1275A/D

VDC/ms

VDC/s

80V/75ms

60V/50ms

60V/100ms

80V/100ms

100V/50ms

48V/1s

Compliant

Compliance with

standards voltage

spike limit

*with companion

filter FGDS series

50 Ohms impedance

15 mJ energy content

MIL-STD-704A/F

AECMA EN2282

AIR2021E

DO160E cat A/Z

MIL-STD-1275A/D

600V/10µs

400V/100µs

600V/10µs

250V/70µs

Compliant*

Under voltage

lock- out (UVLO) Turn-on/Turn-off threshold Minimum

Maximum

VDC

Start up time Ui nominal 28V

Full load Maximum ms 6

Inrush current

limitation

Full temperature range

C=1000µF Typical A 5

No load input

current

Ui nominal 28V

No load Maximum mA 10

Output

Nominal voltage in

normal operation

Ui < 42V

Full load Minimum / Ui - 125mV

Nominal voltage in

transient

protection mode

In transient

Input voltage range

Minimum

Nominal

Maximum

VDC

Output voltage

slew rate During start-up time Typical VDC/ms 5

Output current Full temperature range

Ui min. to max. Maximum A 20 (or 300W)

Output Power Full temperature range

Ui min. to max. Maximum W see page 4

figure 5

Power dissipation Ui nominal 28V

Output current 20A Maximum W 3

For locations, phone, fax, E-Mail see back cover

LGDS-300 Series

Gaia Converter FC08-059.01/10 Revision D

Hi-Rel

Grade

0 10 20 30 40 50 60 70 80 90 100

100

150

200

250

300

350

Vin (Vdc)

Pout (W)

300W max

20A max

Transient operation

Area

Permanent operation

Area

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

LGDS-300 Series

Gaia Converter FC08-059.01/10 Revision D

Hi-Rel

Grade

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

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.55

0.6

0.65

0.7

0.75

0.8

0.85

0.9

0.95

1.05

1.1

1.15

1.2

1.25

1.3

1.35

1.4

1.45

1.5

1.55

1.6

1.65

time (s)

Limitor Dissipated Energy (J)

MIL-STD1275C

MIL-STD1275D

DO160E-CATZ

MILSTD1275A/B

MIL-STD-1275A/B/C/D

(100V/50ms)

DO-160E/CATZ worst case

60V / 510ms

MIL-STD-1275D worst case

75V / 240ms

MIL-STD-1275C worst case

68V / 170ms

LGDS300

42V

300W

VIN

MIL-STD-1275A/B worst case

85V / 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)

Limitor dissipated energy (J)

100V/50ms pulses

7 pulses at 1sec interval

according MIL-STD-1275C

standard testing

80V/100ms pulses

3 pulses at 10 sec interval

according DO-160E standard testing

LGDS-300-O-K

MIL-STD-1275C/D Repetitive surge at

worst case energy operation

100V/50ms pulses

5 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 for

single pulse and repetitive surge conditions.

For locations, phone, fax, E-Mail see back cover

LGDS-300 Series

Gaia Converter FC08-059.01/10 Revision D

Hi-Rel

Grade

6- Protection Functions

Characteristics Protection Device Recovery Limit or

typical Specifications

Output over current protection (OCP) Hiccup circuitry with

auto-recovery

Automatic

recovery Permanent See section 10

Over temperature protection (OTP) Thermal device with

hysteresis cycle

Automatic

recovery 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°C

Case at 85°C

1 300 000 Hrs

425 000 Hrs

Airborne, Inhabited,

Cargo (AIC)

Case at 40°C

Case at 85°C

675 000 Hrs

250 000 Hrs

Mean Time Between Failure (MTBF)

According to IEC-62380-TR

Civilian avionics,

calculators

Ambient at 55°C

100% time on 1 800 000 Hrs

Parameter Conditions Limit or

typical Specifications

Electric strength test voltage Input to output

All pins to case

Minimum

No isolation

500 VDC / 1 min

Isolation resistance 50 VDC, all pins to case Minimum 100 MOhm

For locations, phone, fax, E-Mail see back cover

LGDS-300 Series

Gaia Converter FC08-059.01/10 Revision D

Hi-Rel

Grade

8- Thermal Characteristics

Characteristics Conditions Limit or typical Performances

Operating ambient temperature

range at full load Ambient temperature * Minimum

Maximum

- 40°C

+ 85°C

Operating case temperature

range at full load Case temperature Minimum

Maximum

- 40°C

+105°C

Storage temperature range Non functionning Minimum

Maximum

- 55°C

+ 125°C

Thermal resistance Rth case to ambient in free air

natural 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 temperature

admissible for the DC/DC converter corresponding to the maximum operating case temperature of 105°C depends on the

ambient 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 case

temparature 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/ηη

ηη

η - 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

LGDS-300 Series

Gaia Converter FC08-059.01/10 Revision D

Hi-Rel

Grade

9- Environmental Qualifications

The 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-202G

Method 108A

Altitude

Altitude level C

Duration

Climb up

Stabilization

Status of unit

40 000 ft@-55°C

30 min.

1 000 ft/min to 70 000 ft@-55°C,

30 min.

unit operating

MIL-STD-810E

Method 500.3

Humidity cyclic

Number of cycle

Cycle duration

Relative humidity variation

Temperature variation

Status of unit

Cycle I : 24 Hrs

60 % to 88 %

31°C to 41°C

unit not operating

MIL-STD-810E

Method 507.3

Humidity steady

Damp heat

Temperature

Duration

Status of unit

93 % relative humidity

40°C

56 days

unit not operating

MIL-STD-202G

Method 103B

Salt atmosphere

Temperature

Concentration NaCl

Duration

Status of unit

35°C

5 %

48 Hrs

unit not operating

MIL-STD-810E

Method 509.3

Temperature

cycling

Number of cycles

Temperature change

Transfert time

Steady state time

Status of unit

200

-40°C / +85°C

40 min.

20 min.

unit operating

MIL-STD-202A

Method 102A

Temperature

shock

Number of shocks

Temperature change

Transfert time

Steady state time

Status of unit

100

-55°C / +105°C

10 sec.

20 min.

unit not operating

MIL-STD-202G

Method 107G

Mechanical Qualifications

Vibration

(Sinusoidal)

Number of cycles

Frequency / amplitude

Frequency / acceleration

Duration

Status of unit

10 cycles in each axis

10 to 60 Hz / 0.7 mm

60 to 2 000 Hz / 10 g

2h 30 min. per axis

unit not operating

MIL-STD-810D

Method 514.3

Shock

(Half sinus)

Number of shocks

Peak acceleration

Duration

Shock form

Status of unit

3 shocks in each axis

100 g

6 ms

1/2 sinusoidal

unit not operating

MIL-STD-810D

Method 516.3

Bump

(Half sinus)

Number of bumps

Peak acceleration

Duration

Status of unit

2 000 Bumps in each axis

40 g

6 ms

unit not operating

MIL-STD-810D

Method 516.3

For locations, phone, fax, E-Mail see back cover

LGDS-300 Series

Gaia Converter FC08-059.01/10 Revision D

Hi-Rel

Grade

10- Description of Protections

10-1 Output Over Current Protection (OCP)

The LGDS-300 provides a circuit breaker function that latches

the output off if the load current exceeds the current limit

threshold for a duration. The circuit breaker function

automatically attempts to restart power after a load current

fault at a low duty cycle to prevent the LGDS-300 from

overheating. The over current protection function protects

the module against over load of any duration and restores

the module to normal operation when the over load is

removed. It operates in «hiccup» mode by testing

periodically if an overload is applied (typically every 1s

recovery time). The overload detection threshold is typically

30A with a detection time lower than 5ms.

10-2 Inrush Current Limitation

The inrush current limitation function operates by limiting

the output voltage ramp up. It is internally set at 5V/ms

typically. The inrush current is calculated as follow.

inrush

out

where :

• Cout is the capacitor value connected to the output

•

out

= 5V/ms

By adding a capacitor connected across the pins «Drive» &

«Gi», and in order to reduce the inrush current the value

out

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 inhibit

the module as long as the overheat is present and restores

to normal operation automatically when overheat is

removed.

The LGDS-300 includes 3 types of protection devices.

time

recovery time

detection time

recovery time

100

Vo (%)

Temperature

120˚c

Off

10˚c

OUT

DRIVE

OUT

LGDS-300

+Vo

Drive

DRIVE

is given in nF

out

= 50 V/ms

dt 10 + C

DRIVE

For locations, phone, fax, E-Mail see back cover

LGDS-300 Series

Gaia Converter FC08-059.01/10 Revision D

Hi-Rel

Grade

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 can

be externally achieved either by a standard solution using a schottky diode or either a low losses solution using a N

channel power MOSFET. The following figures are showing both solutions.

LGDS-300

+Vo

Drive

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 low

loss reverse polarity protection.

Parameter Unit Min. Typ. Max. Notes, conditions

Drive voltage Vdc Vo-0.6 / Vo+12

Drive current

source

sink

µA

-1000

100

0 Must be externally limited

LGDS-300

+Vo

Drive

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 filter

together 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 filter

FGDS-10A-50V

+Vo

MGDM-series

+Vo

MGDM-series

+Vo

MGDM-series

EMI input filter

FGDS-10A-50V

LGDS-300

Vo Vi

Gi Go

GndGnd

220µF/50V

Note : such design with joint EMI filter is incompatible with reverse polarity compatibility. In such case place the second EMI

filter after LGDS-300.

For locations, phone, fax, E-Mail see back cover

LGDS-300 Series

Gaia Converter FC08-059.01/10 Revision D

Hi-Rel

Grade

12- Dimensions

Dimension 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)

4 5

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, location of manufacturing.

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.

Printed in France by GAIA Converter Gaia Converter FC08-059.01/10 Revision D. Graphisme : Philippe Clicq

Represented by :

For more detailed specifications and applications information, contact :

International Headquarters

GAÏA Converter - France

ZI de la Morandière

33185 LE HAILLAN - FRANCE

Tel. : + (33)-5-57-92-12-80

Fax : + (33)-5-57-92-12-89

North American Headquarters

GAÏA Converter Canada, Inc

4038 Le Corbusier Blvd

LAVAL, QUEBEC - CANADA H7L 5R2

Tel. : (514)-333-3169

Fax : (514)-333-4519