Industrial DC/DC CONVERTER
MGDI-20 Wide Input : 20W POWER
• Wide input range and high transient compliance
• Nominal power of 20 W without derating
• Wide temperature range : -40°C/+95°C case
• Soft start
• Permanent short circuit protection
• No optocoupler for high reliability
• RoHS process
Gaia Converter FC97-022.01/11 Revision J
©
REDEFINING THE SOURCE OF POWER
1-General
Industrial
Grade
For locations, phone, fax, E-Mail see back cover
5
The MGDI-20 wide input series is a full family of
DC/DC power modules designed for use in
distributed power architecture where variable
input voltage and transient are prevalent making
them ideal particularly for transportation,
railways or high-end industrial applications. These
modules use a high frequency fixed swiching
technic at 480 KHz providing excellent reliability,
low noise characteristics, high power density and
low profile package. Standard models are
available with wide input voltage range of 4,7-
16, 9-36, 16-40 and 36-140 volts, with high
transient levels. The series include single and bi
output voltage choices of 3,3, 5, 12, 15, +/-5,
+/-12 or +/-15 volts.
No external heatsink is required for the MGDI-
20 series to supply 20W output power over the
case temperature range of -40°C up to 95°C.
The MGDI-20 series is designed in conformity
with safety standards EN60950 and UL1950.
All the modules are designed with LC network
filters to minimize reflected input current ripple
and output voltage ripple according to EN55022
and FCC Part 15J standard.
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.
3:1 & 4:1 Wide Input
Single, Bi & Triple Outputs
Metallic Case - 1 500 VDC Isolation
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
Permanent
D : 4,7-16 VDC
H : 9-36 VDC
J : 16-40 VDC*
Q : 36-140 VDC**
Transient
n/a
40 VDC/100 ms
45 VDC/100 ms
175 VDC/100 ms
* for 45 Vdc consult factory
** for 154 Vdc consult factory
Options :
/M : option for On/Off function
Single output model : MGDSI - 20 - input output option
/
Bi output model : MGDBI - 20 - input output option
/
Triple output model : MGDTI - 20 - input output option
/
For locations, phone, fax, E-Mail see back cover
2
Industrial
Grade
MGDI-20 Wide Input Series
Gaia Converter FC97-022.01/11 Revision J
©
5
2- Product Selection (continued)
Current
4 A
4 A
1,6 A
1,3 A
4 A
4 A
1,6 A
1,3 A
+/- 2 A
+/- 0,80 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
4 A
1,6 A
1,3 A
+/- 2 A
+/- 0,80 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
4 A
1,6 A
1,3 A
+/- 2 A
+/- 0,80 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
MGDSI-20-D-B
MGDSI-20-D-C
MGDSI-20-D-E
MGDSI-20-D-F
MGDSI-20-H-B
MGDSI-20-H-C
MGDSI-20-H-E
MGDSI-20-H-F
MGDBI-20-H-C
MGDBI-20-H-E
MGDBI-20-H-F
MGDTI-20-H-BE
MGDTI-20-H-BF
MGDTI-20-H-CE
MGDTI-20-H-CF
MGDSI-20-J-B
MGDSI-20-J-C
MGDSI-20-J-E
MGDSI-20-J-F
MGDBI-20-J-C
MGDBI-20-J-E
MGDBI-20-J-F
MGDTI-20-J-BE
MGDTI-20-J-BF
MGDTI-20-J-CE
MGDTI-20-J-CF
MGDSI-20-Q-B
MGDSI-20-Q-C
MGDSI-20-Q-E
MGDSI-20-Q-F
MGDBI-20-Q-C
MGDBI-20-Q-E
MGDBI-20-Q-F
MGDTI-20-Q-BE
MGDTI-20-Q-BF
MGDTI-20-Q-CE
MGDTI-20-Q-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
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
4,7-16 VDC
4,7-16 VDC
4,7-16 VDC
4,7-16 VDC
9-36 VDC
9-36 VDC
9-36 VDC
9-36 VDC
9-36 VDC
9-36 VDC
9-36 VDC
9-36 VDC
9-36 VDC
9-36 VDC
9-36 VDC
16-40 VDC
16-40 VDC
16-40 VDC
16-40 VDC
16-40 VDC
16-40 VDC
16-40 VDC
16-40 VDC
16-40 VDC
16-40 VDC
16-40 VDC
36-140 VDC
36-140 VDC
36-140 VDC
36-140 VDC
36-140 VDC
36-140 VDC
36-140 VDC
36-140 VDC
36-140 VDC
36-140 VDC
36-140 VDC
Options
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
/M
Converter Selection Chart
MGDS I - 20 - Q - C / M
Number of Outputs :
S : single output
B : bi ouput
T : triple output
Input voltage range :
D : 4,7-16 VDC
H : 9-36 VDC
J : 16-40 VDC*
Q : 36-140 VDC**
Output voltage :
See table page 1
Option :
/M : On/Off function
* for 45 Vdc consult factory
** for 154 Vdc consult factory
For locations, phone, fax, E-Mail see back cover
3
Industrial
Grade
MGDI-20 Wide Input Series
Gaia Converter FC97-022.01/11 Revision J
©
5
3- Electrical Specifications
Data are valid at +25°C, unless otherwise specified.
Parameter Conditions Limit or
typical Units Single Output MGDSI-20
20-D 20 - H 20 - J 20 - Q
Input
Nominal input voltage Full temperature range Nominal VDC 9 20 24 72
Permanent input
voltage range (Ui) Full temperature range Min. - Max. VDC 4,7-16 9-36 16-40 36-140
Extended permanent
input voltage range
Full temperature range
(Consult factory) Min. - Max. VDC / / 16-45 36-154
Transient input voltage Full load Maximum
Maximum
VDC/S
VDC/S
/
/
40/0,1
/
45/0,1
/
175/0,1
165/1
Start up input voltage
Undervoltage lock-out
No undervoltage lock-out
turn-on/turn-off threshold
Minimum
Min. - Max.
VDC
VDC
/
4-4,5
/
7-8,5
/
12-15
33
/
Start up time
Ui nominal
Nominal output
Full load : resistive
Maximum ms 40 40 40 40
Reflected ripple current Ui nominal, full load at
switching freq. BW = 20MHz Typical mApp 50 50 50 50
Input current in short
circuit mode (Average)
Ui nominal
Short-circuit Maximum mA 100 60 60 40
No load input current Ui nominal
No load Maximum mA 100 60 60 40
Output
Output voltage *
Full temperature range
Ui min. to max.
75% load
Nominal
Nominal
Nominal
Nominal
VDC
VDC
VDC
VDC
3,3
5
12
15
3,3
5
12
15
3,3
5
12
15
3,3
5
12
15
Set Point accuracy Ambient temperature : +25°c
Ui nominal, 75% load Maximum % +/- 2 +/- 2 +/- 2 +/- 2
Output power Full temperature range
Ui min. to max. Maximum W 20 20 20 20
Output current **
3,3V output
5V output
12V output
15V output
Full temperature range
Ui min. to max.
Maximum
Maximum
Maximum
Maximum
A
A
A
A
4
4
1,6
1,3
4
4
1,6
1,3
4
4
1,6
1,3
4
4
1,6
1,3
Ripple output voltage ***
3,3V and 5V output
12V output
15V output
Ui nominal
Full load
BW = 20MHz
Maximum
Maximum
Maximum
mVpp
mVpp
mVpp
50
100
150
50
100
150
50
100
150
50
100
150
Line regulation Ui min. to max.
Full load Typical % +/- 1 +/- 1 +/- 1 +/- 1
Load regulation **** Ui nominal
25% to full load Typical % +/- 2,5 +/- 2,5 +/- 2,5 +/- 2,5
Efficiency Ui nominal
Full load Typical % 81 82 82 83
Maximum admissible
Capacitive load
3,3V and 5V output
12V and 15V output
Ui nominal
Full load
Per output Maximum
Maximum
µF
µF
2.000
680
2.000
680
2.000
680
2.000
680
Note * : For proper operation the MGDI-20 module requires to install a 22µF chemical or tantalum capacitance accross output terminals.
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 contact factory.
For locations, phone, fax, E-Mail see back cover
4
Industrial
Grade
MGDI-20 Wide Input Series
Gaia Converter FC97-022.01/11 Revision J
©
5
3- Electrical Specifications (continued)
Data are valid at +25°C, unless otherwise specified.
Parameter Conditions Limit or
typical Units Bi Output MGDBI-20
20 - H 20 - J 20 - Q
Input
Nominal input voltage Full temperature range Nominal VDC 20 24 72
Permanent input
voltage range (Ui) Full temperature range Min. - Max. VDC 9-36 16-40 36-140
Extended permanent input
voltage range
Full temperature range
(Consult factory) Min. - Max. VDC / 16-45 36-154
Transient input voltage Full load Maximum
Maximum
VDC/S
VDC/S
40/0,1
/
45/0,1
/
175/0,1
165/1
Start up input voltage
Undervoltage lock-out
No undervoltage lock-out
turn-on/turn-off threshold
Minimum
Min. - Max.
VDC
VDC
/
7-8,5
/
12-15
33
/
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 60 60 40
No load input current Ui nominal
No load Maximum mA 60 60 40
Output
Output voltage *
Full temperature range
Ui min. to max.
75% load
Nominal
Nominal
Nominal
VDC
VDC
VDC
+/- 5
+/- 12
+/- 15
+/- 5
+/- 12
+/- 15
+/- 5
+/- 12
+/- 15
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 +/- 10 +/- 10 +/- 10
Output current **
+/- 5V output
+/- 12V output
+/- 15V output
Full temperature range
Ui min. to max.
Maximum
Maximum
Maximum
A
A
A
+/- 2
+/- 0,80
+/- 0,65
+/- 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
Maximum
Maximum
mVpp
mVpp
mVpp
50
100
150
50
100
150
50
100
150
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
Cross load output
regulation
Ui nominal
+ Vout nominal load
- Vout from 25% to full load
Typical % +/- 0,5 +/- 0,5 +/- 0,5
Efficiency Ui nominal
Full load Typical % 82 82 83
Maximum admissible
Capacitive load
5V output
12V and 15V output
Ui nominal
Full load
Per output Maximum
Maximum
µF
µF
1.000
330
1.000
330
1.000
330
Note * : For proper operation the MGDI-20 module requires to install a 22µF chemical or tantalum capacitance accross output terminals.
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 contact factory.
For locations, phone, fax, E-Mail see back cover
5
Industrial
Grade
MGDI-20 Wide Input Series
Gaia Converter FC97-022.01/11 Revision J
©
5
3- Electrical Specifications (continued)
Data are valid at +25°C, unless otherwise specified.
Parameter Conditions Limit or
typical Units Tri Output MGDTI-20
20 - H 20 - J 20 - Q
Input
Nominal input voltage Full temperature range Nominal VDC 20 24 72
Permanent input
voltage range (Ui) Full temperature range Min. - Max. VDC 9-36 16-40 36-140
Extended permanent
input voltage range
Full temperature range
(Consult factory) Min. - Max. VDC / 16-45 36-154
Transient input voltage Full load Maximum
Maximum
VDC/-
S
VDC/-
S
40/0,1
/
45/0,1
/
175/0,1
165/1
Start up input voltage
Undervoltage lock-out
No undervoltage lock-out
turn-on/turn-off threshold
Minimum
Min. - Max.
VDC
VDC
/
7-8,5
/
12-15
33
/
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 60 60 40
No load input current Ui nominal
No load Maximum mA 60 60 40
Output
Output voltage *
Full temperature range
Ui min. to max.
75% load
Nominal
Nominal
Nominal
Nominal
VDC
VDC
VDC
VDC
3,3 & +/- 12
3,3 & +/- 15
5 & +/- 12
5 & +/- 15
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 +/- 2
Output power Full temperature range
Ui min. to max. Maximum W 10 & +/- 5 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
Maximum
Maximum
Maximum
A
A
A
A
2 & +/- 0,4
2 & +/- 0,3
2 & +/- 0,4
2 & +/- 0,3
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
Maximum
Maximum
mVpp
mVpp
mVpp
50
100
150
50
100
150
50
100
150
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
Cross load output
regulation
Ui nominal
+ Vout nominal load
- Vout from 25% to full load
Typical % +/- 0,5 +/- 0,5 +/- 0,5
Efficiency Ui nominal
Full load Typical % 82 82 83
Maximum admissible
Capacitive load
3,3V and 5V output
12V and 15V output
Ui nominal
Full load
Per output Maximum
Maximum
µF
µF
1 000
100
1 000
100
1 000
100
Note * : For proper operation the MGDI-20 module requires to install a 22µF chemical or tantalum capacitance accross output terminals.
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.
For locations, phone, fax, E-Mail see back cover
6
Industrial
Grade
MGDI-20 Wide Input Series
Gaia Converter FC97-022.01/11 Revision J
©
5
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 12
Output overvoltage protection (OVP) Zener clamp /
Maximum
Maximum
Maximum
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
4.7-16 VDC input : 480 KHz
9-36 VDC input : 480 KHz
16-40 VDC input : 480 KHz
36-140 VDC input : 430 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 70°C
750 000 Hrs
320 000 Hrs
Ground mobile (Gm) Case at 40°C
Case at 70°C
208 000 Hrs
85 000 Hrs
Mean Time Between Failure (MTBF)
According to IEC-62380-TR Railway, Payphone Ambient at 25°C
100% time on 240 000 Hrs
Parameter Conditions Limit or typical Specifications
Electric strength test voltage (basic version) 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
7
Industrial
Grade
MGDI-20 Wide Input Series
Gaia Converter FC97-022.01/11 Revision J
©
5
Electromagnetic Interference according to EN55022
Conducted
noise
emission
Configuration With common mode capacitor
C c = 10nF and input capacitor C i
With common mode capacitor
C c = 10nF and external filter
Models
4,7-16V input models Class A, C i =10µF/ 35 V tantalum + inductance 4,7mH Class B
9-36V input models Class A, C i =4,7µF/ 50 V tantalum Class B
16-40V input models Class A, C i =4,7µF/ 50 V tantalum Class B
36-140V input models Class A, C i =47µF / 200 V chemical /
Radiated
noise
emission
Configuration With common mode capacitor C c = 10 nF
Models
All models Class B
8- Electromagnetic Interference
Electromagnetic interference requirements according to EN55022 class A and class B can be easily achieved as indicated in
the following table :
Electromagnetic interference requirements according to
EN55022 class A can be easily achieved by adding an
external common mode noise capacitance
(CC = 10nF/rated voltage depending on isolation
requirement) and an input capacitance (CI Value explained
in previous table). This common mode noise capacitance
CC should be layed-out as close as possible from the DC/
DC converter.
8-1 Module Compliance with EN55022 class A Standard
8-2 module Compliance with EN 55022 Class B Standard
Electromagnetic interference requirements according to
EN55022 class B can be easily achieved by adding an
external input filter consisting of 4 capacitances, a common
mode choke, a differential mode inductance
and the common mode noise capacitance (CC = 10nF/rated
voltage depending on isolation requirement).
Please consult EN55022 Class B EMI Filter design note for
further details.
Input capacitance Ci
Common mode noise capacitance C = 10nF
c
- Input
+ Input
MGDI - Series
Vi Vo
Gi Go
* Note : Value of common mode noise capacitance depends on isolation requirements (typically 10nF/1500V or 10nF/3000V ). In case of dielectric strengh test in AC mode,
adapt the capacitance value in order to be compatible with maximum admissible leakage current.
Common mode noise capacitance C = 10nF
c
MGDI - Series
Vi Vo
Gi Go
C4
C2
C3
L2
C1
L1
- Input
+ Input
For locations, phone, fax, E-Mail see back cover
8
Industrial
Grade
MGDI-20 Wide Input Series
Gaia Converter FC97-022.01/11 Revision J
©
5
9- Surge Susceptibility EN61000-4-5 & EN50155
Surge susceptibility requirements according to EN50155, EN61000-4-5 and electromagnetic interference requirements of
EN55022 class A can easily be achieved using either :
• a limitor module LGDS-50 series : ready-to-use single module solution,
• an input limitor filter : schematics of discret components, to sustain the following surge levels :
9-1 Surge Protection with Off-the-Shelf Solution : LGDS-50 Limitor Module
To sustain surge requirements of EN61000-4-5, and EN50155 together with EN55022 class A, GAÏA Converter proposes a
ready-to-use single product. Depending on bus input range two references of limitor module are existing with references
as follow :
These modules designated LGDS-50 series are designed up to 50W power and will protect MGDI-20 series with 9-36, 16-40 or
36-140 VDC input against surges.
The implantation of LGDS-50 with modules can be undertook as follow :
9-2 Surge Protection with Discrete Components
To sustain surge requirements of EN61000-4-5 and EN50155 together with EN55022 class A, GAÏA Converter propo-
ses the following front protection filter.
Please consult EN50155 Transient/EMI filter design note for further details.
* Note : Value of common mode noise capacitance rated voltage depends on isolation requirements.
Please consult LGDS-50 datasheet for further details.
MGDI - Series
Vi Vo
Gi Go
MGDI - Series
Vi Vo
Gi Go
LGDS-50
- Input
+ Input
Characteristics Standards Levels
Spikes
Line to line
EN 61000-4-5 Level 4 with 4 000 V waveform 50 µs, impedance 2 Ohm
EN 50155 Level 1 800 V waveform 50 µs, impedance 100 and 5 Ohm
Level 8 400 V waveform 0.1 µs, impedance 100 Ohm
Spikes
Line to earth
EN 61000-4-5 Level 4 with 4 000 V waveform 50 µs, impedance 12 Ohm
EN 50155 Level 1 800 V waveform 50 µs, impedance 100 and 5 Ohm
Level 8 400 V waveform 0.1 µs, impedance 100 Ohm
Input types DC/DC converter family Limitor module reference
9-36 VDC Input
16-40 VDC Input
36-140 VDC Input
MGDI-20-H series
MGDI-20-J series
MGDI-20-Q series
LGDS-50-J-K
LGDS-50-J-K
LGDS-50-Q-K
For locations, phone, fax, E-Mail see back cover
9
Industrial
Grade
MGDI-20 Wide Input Series
Gaia Converter FC97-022.01/11 Revision J
©
5
10- Thermal Characteristics
Characteristics Conditions Limit or typical Performances
Operating ambient temperature
range at full load Ambient temperature * Minimum
Maximum
- 40°C
+ 71°C
Operating case temperature
range at full load Case temperature Minimum
Maximum
- 40°C
+95°C
Storage temperature range Non functionning Minimum
Maximum
- 40°C
+ 105°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 + 95°C.
10 10030 807060 9020 40 50
25%
75%
50%
100%
Power (W)
Temperature (˚C)
Full load ambient temperature without derating : 71˚C
Maximum case temperature : 95˚C
Natural convection operation area
Additionnal cooling operation area
Maximum storage temperature : 105˚C
The MGDI-20 series operating case temperature must not exceed 95°C. The maximum ambient temperature admissible for
the DC/DC converter corresponding to the maximum operating case temperature of 95°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 = 95°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 = 95°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 95°C (white area in the following graph).
For locations, phone, fax, E-Mail see back cover
10
Industrial
Grade
MGDI-20 Wide Input Series
Gaia Converter FC97-022.01/11 Revision J
©
5
11- 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
1 000 Hrs
95°C case
unit operating
IEC 68-2-2
Humidity steady
Damp heat
Temperature
Duration
Status of unit
93 % relative humidity
40°C
56 days
unit not operating
IEC 68-2-3
Test Ca
Temperature
cycling
Number of cycles
Temperature change
Transfert time
Steady state time
Status of unit
200
-40°C / +71°C
40 min.
20 min.
unit not operating
IEC 68-2-14
Test N
Temperature
shock
Number of shocks
Temperature change
Transfert time
Steady state time
Status of unit
50
-40°C / +105°C
10 sec.
20 min.
unit not operating
IEC 68-2-14
Test Na
Mechanical Qualifications
Vibration
(Sinusoidal)
Number of cycles
Frequency : amplitude
Frequency : acceleration
Amplitude /acceleration
Duration
Status of unit
10 cycles in each axis
10 to 60 Hz / 0.7 mm
60 to 2000 Hz / 10 g
0.7 mm/10 g
2h 30 min. per axis
unit not operating
IEC 68-2-6
Test Fc
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
IEC 68-2-27
Test Ea
Bump
(Half sinus)
Number of bumps
Peak acceleration
Duration
Status of unit
2 000 bumps in each axis
25 g
6 ms
unit not operating
IEC 68-2-29
Test Eb
Electrical Immunity Qualifications
Electrical
discharge
susceptibility
Number of discharges
Air discharge level
Contact discharge level
Air discharge level
Contact discharge level
10 positive & 10 negative discharges
4 kV : sanction A
2 Kk : sanction A
8 Kk : sanction B
4 kV : sanction B
EN55082-2 with :
EN61000-4-2
IEC 801-2
Electrical field
susceptibility
Antenna position
Electromagnetic field
Wave form signal
Frequency range
at 1 m
10 V/m
AM 80%, 1 kHz
26 MHz to 1 GHz
EN55082-2 with :
EN61000-4-3
IEC801-3
Electrical fast
transient
susceptibility
Burst form
Wave form signal
Impedance
Level 1
Level 3
5/50 ns
5 kHz with 15 ms burst duration period 300 ms
50 Ohm
0,5 kV : sanction A
2 kV : sanction B
EN55082-2 with :
EN61000-4-4
IEC801-4
Surge
Susceptibility
Surge form
Impedance
Level 4
1,2/50 µs
2 Ohm
4 kV : with transient protection or LGDS-50
limitor module (see section surge)
EN61000-4-5
EN50155
For locations, phone, fax, E-Mail see back cover
11
Industrial
Grade
MGDI-20 Wide Input Series
Gaia Converter FC97-022.01/11 Revision J
©
5
12- Description of Protections
12-1 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.
For «Q» input range models, the UVLO protection is not
implemented.
12-2 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 with a detection time lower than 5ms.
12-3 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.
13- Description of Functions
13-1 Option (/M) : On/Off Function
The optionnal control pin 4 (On/Off) can be used for appli-
cations 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.
Vin
On
Off
UVLO
Turn-on/Turn-off
time
recovery time
detection time
recovery time
x
100
Vo (%)
GI
On/Off
Command
For locations, phone, fax, E-Mail see back cover
12
Industrial
Grade
MGDI-20 Wide Input Series
Gaia Converter FC97-022.01/11 Revision J
©
5
14- Application Notes
14-1 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.
14-2 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.
14-3 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.
14-4 Safety Consideration
For safety agency approval of the system in which the power
module is used, the power module must be installed in
compliance with requirements of the UL1950, CSA22.2-950,
EN60950 standards : i.e if the output circuit operator ac-
cessible, it shall be a SELV circuit.
A SELV (Safety Extra Low Voltage) output for a converter is
a secondary circuit that under normal operation or a single
fault condition cannot reach hazardous voltage (i.e Voltage
above 60 VDC) between any two accessible parts or an
accessible part and protective each.
In the event of a single fault condition (insulation or
component failure), the voltage in accessible parts of SELV
circuits shall not exceed 60 VDC for longer than 0.2 sec.
and an absolute limit of 120 VDC SELV circuits must be
separated from hazardous voltages (e.g primary circuits)
by two levels of protection which may be double or reinforced
insulation or basic insulation combined with an earthed
conductive barrier.
Generally DC/DC Converters are power by an input bus that
comes from a front end which can be an AC/DC powered
supply, a transformer, a charger or a battery. It is the sole
responsability of the user to ensure compliance of the front-
end with the relevant safety requiements.
The following table resumes some possible installation con-
figuration using Gaïa Converter wide input series.
Bus voltage at the input of
DC/DC converter Safety status of the input bus DC/DC converter
requirements
Resulting safety at the
DC/DC converter output
Voltage : < 60 VDC Basic isolation with ELV circuit
Basic isolation with earthed SELV circuit
Operationnal insulation
Operationnal insulation
Earthed SELV circuit
SELV circuit
Hazardous voltage : > 60VDC Basic isolation with hazardous voltage
Double or reinforced insulation with hazadous voltage
Operationnal insulation
Operationnal insulation
Earthed SELV circuit
Earthed SELV circuit
Go
+Vo
-VoGI
VI
2 x Vo
Go
Vo
GI
VI
Go
Vo
GI
VI
2 x Vo
Go
Vo
GI
VI
Go
Vo
GI
VI
Vo
For locations, phone, fax, E-Mail see back cover
13
Industrial
Grade
MGDI-20 Wide Input Series
Gaia Converter FC97-022.01/11 Revision J
©
5
15- Dimensions
Dimension are given in mm (inches). Tolerance : +/- 0,2 mm (+/- 0.01 “) unless otherwise indicated.
Weight : 80 grams (2.8 Ozs) max.
18- Connections
* Option /M : Pin 4 connected for On/Off function.
Please add /M to module reference.
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")
1 2 3 4
5 6 7 8
Bottom view
Pin Single Bi Triple
1 + Input (Vi) + Input (Vi) + Input (Vi)
2 - Input (Gi) - Input (Gi) - Input (Gi)
3 Case Case Case
4 Non connected* Non connected* Non connected*
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)
16- Materials
Case : Matallic black painted coating.
Pins : Plated with pure matte tin over nickel underplate.
17- 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 FC97-005.01/11 Revision J. 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