MGDB-20-J-BE/S-L - GAIA Converter

Hi-Rel DC/DC CONVERTER

MGDM-20 : 20W POWER

• 28Vdc input compliant with MIL-STD-704 D/E

• Nominal power up to 20 W

• Wide temperature range : -40°C/+105°C case

• High efficiency (typ. 84%)

• Soft start

• Galvanic isolation 1.500 VDC

• Integrated LC EMI filter

• Permanent short circuit protection

• No optocoupler for high reliability

• RoHS or Leaded process option

Gaia Converter FC98-016.01/11 Revision N

REDEFINING THE SOURCE OF POWER

1-General

Single, Bi & Triple Outputs

Metallic Case - 1.500 VDC Isolation

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Grade

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

The MGDM-20 series is a complete line of high

performance DC/DC power modules designed for

aerospace, military and high-end industrial ap-

plications. These modules use a high frequency

fixed swiching technic at 480 KHz providing ex-

cellent reliability, low noise characteristics and

high power density. Standard models are

available with standard input voltage range of

4.5-5.5, 9-36 and 16-40 volts. The series include

single bi and triple output voltage choices of

3,3 , 5, 12, 15 volts.

No external heatsink is required for the MGDM-

20 series to supply 20W output power over the

full temperature range.

All the modules are designed with LC network

filters to minimize reflected input current ripple

and output voltage ripple.

The modules include a soft-start, an input

undervoltage lock-out, a permanent short cir-

cuit protection and an output overvoltage pro-

tection to ensure efficient module protections.

The soft-start allows current limitation and

eliminates inrush current during start-up. The

short circuit protection completely protects the

modules against short-circuits of any duration

by a shut-down and restores to normal when

the overload is removed.

The design has been carried out with surface

mount components and is manufactured in a

fully automated process to guarantee high

quality. Each module is tested with a GAIA

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 high

environmental conditions.

2-Product Selection

Input Voltage Range

B : 3,3 VDC

C : 5 VDC or +/-5VDC

E : 12 VDC or +/-12VDC

F : 15 VDC or +/-15VDC

BE : 3,3 VDC and +/-12 VDC

BF : 3,3 VDC and +/-15 VDC

CE : 5 VDC and +/-12 VDC

CF : 5 VDC and +/-15 VDC

Output

Options : Suffix :

/T : option for -55°C start up operating temperature nothing : RoHS process

/S : option for screening and serialization -L : leaded process (available in N. America)

Permanent

C : 4,5-5,5 VDC

H : 9-36 VDC

J : 16-40 VDC

* Consult factory

Transient

n/a

40 VDC/100 ms *

50 VDC/100 ms *

Single output model : MGDS - 20 - input output option suffix

Bi output model : MGDB - 20 - input output option suffix

Triple output model : MGDT - 20 - input output option suffix

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

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MGDM-20 Series

Gaia Converter FC98-016.01/11 Revision N

2- Product Selection (continued)

Current

4 A

1,6 A

1,3 A

4 A

1,6 A

1,3 A

+/- 2A

+/- 0,8 A

+/- 0,65 A

2 A & +/- 0,4 A

2 A & +/- 0,3 A

2 A & +/- 0,4 A

2 A & +/- 0,3 A

4 A

1,6 A

1,3 A

+/- 2A

+/- 0,8 A

+/- 0,65 A

2 A & +/- 0,4 A

2 A & +/- 0,3 A

2 A & +/- 0,4 A

2 A & +/- 0,3 A

Reference

MGDS-20-C-B

MGDS-20-C-C

MGDS-20-C-E

MGDS-20-C-F

MGDS-20-H-B

MGDS-20-H-C

MGDS-20-H-E

MGDS-20-H-F

MGDB-20-H-C

MGDB-20-H-E

MGDB-20-H-F

MGDT-20-H-BE

MGDT-20-H-BF

MGDT-20-H-CE

MGDT-20-H-CF

MGDS-20-J-B

MGDS-20-J-C

MGDS-20-J-E

MGDS-20-J-F

MGDB-20-J-C

MGDB-20-J-E

MGDB-20-J-F

MGDT-20-J-BE

MGDT-20-J-BF

MGDT-20-J-CE

MGDT-20-J-CF

Output

3,3 VDC

5 VDC

12 VDC

15 VDC

3,3 VDC

5 VDC

12 VDC

15 VDC

+/- 5 VDC

+/- 12 VDC

+/- 15 VDC

3,3 & +/- 12 VDC

3,3 & +/- 15 VDC

5 & +/- 12 VDC

5 & +/- 15 VDC

3,3 VDC

5 VDC

12 VDC

15 VDC

+/- 5 VDC

+/- 12 VDC

+/- 15 VDC

3,3 & +/- 12 VDC

3,3 & +/- 15 VDC

5 & +/- 12 VDC

5 & +/- 15 VDC

Input range

4,5-5,5 VDC

9-36 VDC

16-40 VDC

Options

/T , /S

Converter Selection Chart

MGDS - 20 - J - C / T - L

Number of Outputs :

S : single output

B : bi ouput

T : triple output

Input voltage range :

C : 4,5-5,5 VDC

H : 9-36 VDC

J : 16-40 VDC

Output voltage :

See table page 1

Option :

/T : -55°C start up operation

/S : screening & serialization

(consult application note

«screening grades»)

Suffix

-, -L

Suffix :

nothing : RoHS process

-L : Leaded process

(available in N. America)

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

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MGDM-20 Series

Gaia Converter FC98-016.01/11 Revision N

3- Electrical Specifications

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

Parameter Conditions Limit or

typical Units Single Output MGDS-20

20 - C 20 - H 20 - J

Input

Nominal input voltage Full temperature range Nominal VDC 5 20 28

Permanent input

voltage range (Ui) Full temperature range Min. - Max. VDC 4,5-5,5 9-36 16-40

Transient input voltage Full load (Consult factory) Maximum VDC/S / 40/0,1 50/0,1

Undervoltage lock-out

(UVLO) Turn-on/turn-off threshold Minimum

Maximum

VDC

4,3

8,5

Start up time

Ui nominal

Nominal output

Full load : resistive

Maximum ms 40 40 40

Reflected ripple current Ui nominal, full load at

switching freq. BW = 20MHz Typical mApp 50 50 50

Input current in short

circuit mode (Average)

Ui nominal

Short-circuit Maximum mA 100 60 60

No load input current Ui nominal

No load Maximum mA 100 60 60

Output

Output voltage *

Full temperature range

Ui min. to max.

75% load

Nominal

Nomina

Nominall

VDC

3,3

Set Point accuracy Ambient temperature : 25°c

Ui nominal, 75% load Maximum % +/- 2 +/- 2 +/- 2

Output power Full temperature range

Ui min. to max. Maximum W 20 20 20

Output current **

3,3V output

5V output

12V output

15V output

Full temperature range

Ui min. to max.

Maximum

1,6

1,3

1,6

1,3

1,6

1,3

Ripple output voltage ***

3,3V and 5V output

12V output

15V output

Ui nominal

Full load

BW = 20MHz

Maximum

mVpp

Line regulation Ui min. to max.

Full load Typical % +/- 1 +/- 1 +/- 1

Load regulation **** Ui nominal

25% to full load Typical % +/- 2,5 +/- 2,5 +/- 2,5

Efficiency Ui nominal

Full load Typical % See on page 6

Maximum admissible

Capacitive load

3,3V and 5V output

12V and 15V output

Ui nominal

Full load

Per output Maximum

Maximum

µF

2.000

680

2.000

680

2.000

680

Note * : For proper operation the MGDM-20 module requires to install a 22µF chemical or tantalum capacitor accross output terminal.

Note ** : For 9-36V input range, the current is derated at 80% at 9V and increases linearly to full current at 12V.

Note*** : The ripple output voltage is the periodic AC component imposed on the output voltage, an aperiodic and random component (noise) has also to be considered.

This noise can be reduced by adding an external capacitor (typically 10nF/rated voltage depending on isolation requirement) connected between the pin Gin and the pin

Gout of the converter.This capacitor should be layed-out as close as possible from the converter.

Note **** : For load regulation characteristics from 0% to full load, please see page 6.

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

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MGDM-20 Series

Gaia Converter FC98-016.01/11 Revision N

3- Electrical Characteristics (continued)

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

Parameter Conditions Limit or

typical Units Bi Output MGDB-20

20 - H 20 - J

Input

Nominal input voltage Full temperature range Nominal VDC 20 28

Permanent input

voltage range (Ui) Full temperature range Min. - Max. VDC 9-36 16-40

Transient input voltage Full load (Consult factory) Maximum VDC/S 40/0,1 50/0,1

Undervoltage lock-out

(UVLO) Turn-on/turn-off threshold Minimum

Maximum

VDC

8,5

Start up time

Ui nominal

Nominal output

Full load : resistive

Maximum ms 40 40

Reflected ripple current Ui nominal, full load at switching

freq. BW = 20MHz Typical mApp 50 50

Input current in short circuit

mode (Average)

Ui nominal

Short-circuit Maximum mA 60 60

No load input current Ui nominal

No load Maximum mA 60 60

Output

Output voltage *

Full temperature range

Ui min. to max.

75% load

Nominal

VDC

+/- 5

+/- 12

+/- 15

+/- 5

+/- 12

+/- 15

Set Point accuracy Ambient temperature : +25°c

Ui nominal, 75% load Maximum % +/- 2 +/- 2

Output power Full temperature range

Ui min. to max. Maximum W +/- 10 +/- 10

Output current **

+/- 5V output

+/- 12V output

+/- 15V output

Full temperature range

Ui min. to max.

Maximum

+/- 2

+/- 0,80

+/- 0,65

+/- 2

+/- 0,80

+/- 0,65

Ripple output voltage ***

5V output

12V output

15V output

Ui nominal

Full load

BW = 20MHz

Maximum

mVpp

Line regulation Ui min. to max.

Full load Typical % +/- 1 +/- 1

Load regulation **** Ui nominal

25% to full load Typical % +/- 2,5 +/- 2,5

Cross load output regulation

Ui nominal

+ Vout nominal load

- Vout from 25% to full load

Typical % +/- 0,5 +/- 0,5

Efficiency Ui nominal

Full load Typical % See on page 6

Maximum admissible

Capacitive load

5V output

12V and 15V output

Ui nominal

Full load

Per output Maximum

Maximum

µF

1.000

330

1.000

330

Note * : For proper operation the MGDM-20 module requires to install a 22µF chemical or tantalum capacitor accross output terminal.

Note ** : For 9-36V input range, the current is derated at 80% at 9V and increases linearly to full current at 12V.

Note*** : The ripple output voltage is the periodic AC component imposed on the output voltage, an aperiodic and random component (noise) has also to be considered.

This noise can be reduced by adding an external capacitor (typically 10nF/rated voltage depending on isolation requirement) connected between the pin Gin and the pin

Gout of the converter.This capacitor should be layed-out as close as possible from the converter.

Note **** : For load regulation characteristics from 0% to full load, please see page 6.

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

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MGDM-20 Series

Gaia Converter FC98-016.01/11 Revision N

3- Electrical Characteristics (continued)

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

Parameter Conditions Limit or

typical Units Tri Output MGDT-20

20 - H 20 - J

Input

Nominal input voltage Full temperature range Nominal VDC 20 28

Permanent input

voltage range (Ui) Full temperature range Min. - Max. VDC 9-36 16-40

Transient input voltage Full load Maximum VDC/S 40/0,1 50/0,1

Undervoltage lock-out

(UVLO) Turn-on/turn-off threshold Minimum

Maximum

VDC

8,5

Start up time

Ui nominal

Nominal output

Full load : resistive

Maximum ms 40 40

Reflected ripple current Ui nominal, full load at

switching freq. BW = 20MHz Typical mApp 50 50

Input current in short

circuit mode (Average)

Ui nominal

Short-circuit Maximum mA 60 60

No load input current Ui nominal

No load Maximum mA 60 60

Output

Output voltage *

Full temperature range

Ui min. to max.

75% load

Nominal

VDC

3,3 & +/- 12

3,3 & +/- 15

5 & +/- 12

5 & +/- 15

3,3 & +/- 12

3,3 & +/- 15

5 & +/- 12

5 & +/- 15

Set Point accuracy Ambient temperature : +25°c

Ui nominal, 75% load Maximum % +/- 2 +/- 2

Output power Full temperature range

Ui min. to max. Maximum W 10 & +/- 5 10 & +/- 5

Output current **

3,3V & +/- 12V output

3,3V & +/- 15V output

5V & +/- 12V output

5V & +/- 15V output

Full temperature range

Ui min. to max.

Maximum

2 & +/- 0,4

2 & +/- 0,3

2 & +/- 0,4

2 & +/- 0,3

2 & +/- 0,4

2 & +/- 0,3

2 & +/- 0,4

2 & +/- 0,3

Ripple output voltage ***

3,3V and 5V output

12V output

15V output

Ui nominal

Full load

BW = 20MHz

Maximum

mVpp

Line regulation Ui min. to max.

Full load Typical % +/- 1 +/- 1

Load regulation **** Ui nominal

25% to full load Typical % +/- 2,5 +/- 2,5

Cross load output

regulation

Ui nominal

+ Vout nominal load

- Vout from 25% to full load

Typical % +/- 0,5 +/- 0,5

Efficiency Ui nominal

Full load Typical % see on page 6 see on page 6

Maximum admissible

Capacitive load

3,3V and 5V output

12V and 15V output

Ui nominal

Full load

Per output Maximum

Maximum

µF

1.000

100

1.000

100

Note * : For proper operation the MGDM-20 module requires to install a 22µF chemical or tantalum capacitor accross output terminal.

Note ** : For 9-36V input range, the current is derated at 80% at 9V and increases linearly to full current at 12V.

Note*** : The ripple output voltage is the periodic AC component imposed on the output voltage, an aperiodic and random component (noise) has also to be considered.

This noise can be reduced by adding an external capacitor (typically 10nF/rated voltage depending on isolation requirement) connected between the pin Gin and the pin

Gout of the converter.This capacitor should be layed-out as close as possible from the converter.

Note **** : For load regulation characteristics from 0% to full load, please see page 6.

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

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MGDM-20 Series

Gaia Converter FC98-016.01/11 Revision N

3- Electrical Characteristics (continued)

3.3 6.6 9.9 13.2

Output Power (W) (MGDS-20-C-B module)

Figure 1 : Typical efficiency versus load

at nominal input

Efficiency (%)

input 5V

5 10 15 20

Output Power (W) (MGDS-20-C-C module)

Figure 2 : Typical efficiency versus load

at nominal input

Efficiency (%)

input 5V

5 10 15 20

Output Power (W) (MGDS-20-C-E module)

Figure 3 : Typical efficiency versus load

at nominal input

Efficiency (%)

input 5V

5 10 15 20

Output Power (W) (MGDS-20-J-B module)

Figure 4 : Typical efficiency versus load

at nominal input

Efficiency (%)

input 16V

input 40V

input 28V

5 10 15 20

Output Power (W) (MGDS-20-J-C module)

Figure 5 : Typical efficiency versus load

at nominal input

Efficiency (%)

input 28V

input 16V

input 40V

5 10 15 20

Output Power (W) (MGDS-20-J-E module)

Figure 6 : Typical efficiency versus load

at nominal input

Efficiency (%)

input 28V

input 16V

input 40V

5 10 15 20

Output Power (W) (MGDS-20-J-F module)

Figure 7 : Typical efficiency versus load

at various input

Efficiency (%)

input 40V

input 28V

input 16V

5 10 15 20

Output Power (W) (MGDT-20-J-CE module)

Figure 8 : Typical efficiency versus load

at various input

Efficiency (%)

input 40V

input 28V

input 16V

5 10 15 20

Output Power (W) (MGDB-20-J-F module)

Figure 9 : Typical efficiency versus load

at various input

Efficiency (%)

input 40V

input 28V

input 16V

Output Current (A) (MGDS-20-J-C module)

Figure 10 : Typical load regulation

characteristics at nominal input

Output voltage (VDC)

Output Current (A) (MGDS-20-J-E module)

Figure 11 : Typical load regulation

characteristics at nominal input

Output voltage (VDC)

Output Current (A) (MGDS-20-J-F module)

Figure 12 : Typical load regulation

characteristics at nominal input

Output voltage (VDC)

0,00 0,50 1,00 1,50 2,00 2,50 3,00 3,50 4,00

4,9

5,1

5,2

5,3

5,4

5,5

5,6

5,7

5,8

0,00 0,20 0,40 0,60 0,80 1,00 1,20 1,40 1,60 1,80

11,8

12,2

12,4

12,6

12,8

13,2

13,4

13,6

0,00 0,20 0,40 0,60 0,80 1,00 1,20 1,40

14,8

15,2

15,4

15,6

15,8

16,2

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

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MGDM-20 Series

Gaia Converter FC98-016.01/11 Revision N

4- Switching Frequency

6- Protection Functions

Characteristics Protection Device Recovery Limit or typical Specifications

Input undervoltage lock-out (UVLO) Turn-on, turn-off circuit

with no hysteresis

Automatic

recovery Threshold See section 3

Output short circuit protection (SCP) Hiccup circuitry with

auto-recovery

Automatic

recovery Permanent See section 11

Output overvoltage protection (OVP) Zener clamp /

Maximum

For 3.3v : 4v

For 5v : 6v

For 12v : 14v

For 15v : 17v

7- Reliability Data

Parameter Conditions Limit or typical Specifications

Switching frequency

Full temperature range

Ui min. to max.

No load to full load

Nominal, fixed 480 KHz

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

750.000 Hrs

320.000 Hrs

Airborne, Inhabited,

Cargo (AIC)

Case at 40°C

Case at 85°C

270.000 Hrs

105.000 Hrs

Mean Time Between Failure (MTBF)

According to IEC-62380-TR Avionics Military Cargo / Consult factory

Parameter Conditions Limit or typical Specifications

Electric strength test voltage Input to output Minimum 1.500 VDC / 1 min

Electric strength test voltage between

outputs (for dual and triple outputs) Output to output Minimum No isolation

Isolation resistance 500 VDC Minimum 100 MOhm

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

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MGDM-20 Series

Gaia Converter FC98-016.01/11 Revision N

8-1 Module Compliance with MIL-STD-461C/D/E Standards

To meet the latest US military standards MIL-STD-461D/E (and also the MIL-STD-461C) requirements and in particular the

conducted noise emission CE102 (and also CE03) requirements, Gaïa Converter can propose a stand-alone ready-to-use EMI

filter module. This EMI filter module has to be used together with a common mode noise capacitance Cc (10nF/rated voltage

depending on isolation requirement) connected between Gin and Gout.

EMI Filter module reference : FGDS-2A-50V.

Please consult EMI filter datasheet for further details.

8- Electromagnetic Interference

Electromagnetic Interference requirements according to MIL-STD-461C/D/E standards can be easily achieved as indicated in

the following section. The following table resumes the different sections covered by these standards.

Standard Requirements MIL-STD-461C

Standard

MIL-STD-461D/E

Standard

Compliance with GAIA Converter

Module & common mode capacitance

Conducted emission (CE) :

Low frequency

High frequency

CE 01

CE 03

CE 101

CE 102

compliant module stand-alone

compliant with additionnal filter

Conducted susceptibility (CS) :

Low frequency

High frequency

CS 01

CS 02

CS 101

CS114

compliant with additionnal filter

Radiated emission (RE) :

Magnetic field

Electrical field

RE 01

RE 02

RE 101

RE 102

compliant module stand-alone

Radiated susceptibility (RS) :

Magnetic field

Electrical field

RS 01

RS 03

RS 101

RS 103

compliant module stand-alone

MGDM-series

EMI input Filter

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

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MGDM-20 Series

Gaia Converter FC98-016.01/11 Revision N

9- 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 7°C /W

Note * : The upper temperature range depends on configuration, the user must assure a max. case temperature of + 105°C.

10 10030 110807060 9020 40 50

25%

75%

50%

100%

Power (W)

Temperature (˚C)

Full load ambient temperature without derating : 85˚C

Maximum case temperature : 105˚C

Natural convection operation area



Additionnal cooling operation area



Maximum storage temperature : 125˚C

The MGDM-20 series operating case temperature 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 this 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 (white area in the following graph).

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

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MGDM-20 Series

Gaia Converter FC98-016.01/11 Revision N

10- 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 f@-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 2000 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

2000 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

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MGDM-20 Series

Gaia Converter FC98-016.01/11 Revision N

11- Description of Protections

11-1 Input Undervoltage Lock-out (UVLO)

The input undervoltage lock-out protection device turns-

on and turns-off the output voltage when the input bus

voltage reaches the undervoltage lock-out threshold. There

is no hysteresis cycle at turn-on and turn-off.

11-2 Output Short Circuit Protection (SCP)

The short circuit protection device protects the module

against short circuit of any duration and restores the mo-

dule to normal operation when the short circuit is removed.

It operates in «hiccup» mode by testing periodically if an

overload is applied (typically every 200ms recovery time).

The overload detection threshold is typically 200% of maxi-

mum current and typically 300% of maximum current for

‘C’ input range series with a detection time lower than

5ms.

11-3 Output Overvoltage Protection (OVP)

The output overvoltage protection device protects external

components against high voltage or possible overvoltages

which can be supplied by the module (i.e in case of internal

failure). It consists of a zener diode clamping the output

voltage; under worst case conditions this zener diode will

short-circuit.

The output voltage protection is not designed to withstand

externally applied output overvoltages to protect the mo-

dule itself.

12- Description of Functions

12-1 On/Off Function

The control pin 4 (On/Off) can be used for applications

requiring On/Off operation. By using an open collector

command with a transistor Q referenced to the common

terminal (Gi) :

• A logic pulled low (<0.2V@1mA, referenced to Gi)

on pin 4 disables the converter

• No connection or high impedance on pin 4 enables

the converter.

By releasing the On/Off function, the converter will restart

within the start-up time specifications given in table page 3.

For further details please consult ‘’Logic On/Off’’ Applica-

tion Note.

On/Off

Command

Vin

Off

UVLO



Turn-on/Turn-off



time

recovery time

detection time

recovery time

100

Vo (%)

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

Hi-Rel

Grade

MGDM-20 Series

Gaia Converter FC98-016.01/11 Revision N

13- Application Notes

13-1 Connection of Outputs in Series

Any of the bi output converters can be configured to produce

an output of 10V (+/-5 output models), 24V (+/-12V out-

put models), or 30V (+/-15V output models) by connecting

the load across the output (+) and the output (-) with

either output grounded, and leaving the common pin

floating.

13-2 Connection of Modules in Series

The output of single output units can be connected in

series without any precautions to provide higher output

voltage level.

Nevertheless, GAIA Converter recommends to protect each

individual output by a low power shottky diode rated with

the maximum current of the converter to avoid reverse

polarity at any output.

Reverse polarity may occur at start up if the output volta-

ges do not rise at the same time.

13-3 Connection of Modules in Parallel

Several converters with equal output voltage can be

connected in parallel to increase power. Nevertheless some

cares have to be taken in particular as the output voltage

of each converter is slightly different, when paralleling,

the converter with the highest output voltage will source

the most current.

However the GAIA Converter modules are designed with a

“soft’’ output voltage versus current characteristic. This

causes the output voltage of each converter to automatically

adjust downward as its current increases so each converter

very approximately shares the total output current. It is

important that each converter has approximately the same

impedance between their output and the common load.

+Vo

-VoGI

2 x Vo

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

Hi-Rel

Grade

MGDM-20 Series

Gaia Converter FC98-016.01/11 Revision N

14- Dimensions

17- Connections

Dimension are given in mm (inches). Tolerance : +/- 0,2 mm (+/- 0.01 “) unless otherwise indicated.

Weight : 80 grams (2.8 Ozs) max.

1 2 3 4

5 6 7 8

Bottom view



Pin dimensions : O 0,83 mm (0.033 ”)

5,08

(0.20")

5,08

(0.20")

5,08

(0.20")

10,16

(0.40")

10,16

(0.40")

10,16

(0.40")

12,70 

(0.50")

+/-0,8

50,80

(2.00")

45,72 (1.80")

50,80

(2.00")

12,70 

(0.50")



4 

(0.15")

+/-1

2,54 (0.10")

Pin Single Bi Triple

1 + Input (Vi) + Input (Vi) + Input (Vi)

2 - Input (Gi) - Input (Gi) - Input (Gi)

3 Case Case Case

4 On / Off On / Off On / Off

5 Do not connect Output + (+Vo) Output 2+ (+V2)

6 Output (Vo) Common (Go) Output 1 (V1)

7 Common (Go) Output - (-Vo) Common (Go)

8 Do not connect Do not connect Output 2- (-V2)

15- Materials

Case : Metallic black painted coating.

Pins : Plated with pure matte tin over nickel underplate.

16- Product Marking

Upper face : Company logo, location of manufacturing.

Side face : Module reference : MGDx-20-»X»-»Y».

Date code : year and week of manufacturing, suffix, /option.

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 FC97-008.01/11 Revision N 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