Hi-Rel DC/DC CONVERTER
MGDM-26 : 25W POWER
Hi-Rel
Grade
Single Output
Metallic Case - 1 500 VDC Isolation
• 28Vdc input compliant with MIL-STD-704 D/E
• Nominal power up to 25 W
• Wide temperature range : -40°C/+105°C case
• High efficiency (typ. 83%)
• Soft start
• Galvanic isolation 1.500 VDC
• Synchronizable, load sharing and N+1 redundancy
• Integrated LC EMI filter
• No load to full load operation
• Permanent short circuit protection
• No optocoupler for high reliability
• RoHS or Leaded process option
1-General
The MGDM-26 series is a complete line of DC/DC
power modules designed for aerospace, military
and high-end industrial applications. These mo-
dules use a high frequency fixed swiching technic
at 1MHz providing excellent reliability, low noise
characteristics and high power density. Standard
models are available with standard input voltage
range of 9-36 or 16-40 volts. The series include
single output voltage choices of 3,3, 5, 12, 15
volts.
The MGDM-26 series include synchronization and
load sharing functions.
The synchronization function allows to synchronize
more than one converter to one frequency or an
external source frequency. The load sharing allows
parallel operation to increase power with a true
N+1 redundancy.
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 and a permanent short
circuit protection to ensure efficient module pro-
tections. 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. The modules are potted with a bi-
component thermal conductive compound and
package in a metallic case to ensure the module’s
integrity under high environmental conditions.
4
2-Product Selection
Single output model
: MGDS - 26 -
input
output
/
option
suffix
Input Voltage Range
Permanent
Transient
Output
B : 3.3 VDC
C : 5 VDC
E : 12 VDC
F : 15 VDC
H : 9-36 VDC
J : 16-40 VDC
* Consult factory
40 VDC/100 ms *
50 VDC/100 ms *
Options :
/T : option for -55°C start up operating temperature
/S : option for screening and serialization
Suffix :
nothing : RoHS process
-L : leaded process
(available in N. America)
REDEFINING THE SOURCE OF POWER
©
Gaia Converter FC99-041.01/10 Revision I
For locations, phone, fax, E-Mail see back cover
MGDM-26 Series
3- Electrical Specifications
Data are valid at +25°C, unless otherwise specified.
Hi-Rel
Grade
Parameter
Input
Nominal input voltage
Permanent input
voltage range (Ui)
Transient input voltage
Undervoltage lock-out
(UVLO)
Start up time
Reflected ripple current
Input current in short
circuit mode (Average)
No load input current
Input current in inhibit
mode
Output
Output voltage
Conditions
Limit or
typical
Nominal
Min. - Max.
Maximum
Nominal
Nominal
Maximum
Maximum
Maximum
Maximum
Maximum
Units
Single Output MGDS-26
26 - H
20
9-36
40/0,1
8,5
7,5
30
50
35
35
25
26 - J
28
16-40
50/0,1
15,5
14,5
30
50
35
35
25
Full temperature range
Full temperature range
Full load (Consult factory)
Turn-on voltage
Turn-off voltage
Ui nominal
Nominal output
Full load : resistive
Ui nominal, full load at
switching freq. BW = 20MHz
Ui nominal
Short-circuit
Ui nominal
No load
Ui nominal
Inhibit
VDC
VDC
VDC/S
VDC
VDC
ms
mApp
mA
mA
mA
Full temperature range
Ui min. to max.
75% load
Ambient temperature : 25°c
Ui nominal, 75% load
Full temperature range
Ui min. to max.
Full temperature range
Ui min. to max.
Nominal
Nominal
Nominal
Nominal
Maximum
Maximum
Maximum
Maximum
Maximum
Maximum
Maximum
Maximum
Maximum
Maximum
Maximum
Minimum
Maximum
Typical
VDC
VDC
VDC
VDC
%
W
A
A
A
A
mVpp
mVpp
mVpp
%
%
%
%
%
3,3
5
12
15
+/- 2
25
6
5
2,1
1,65
50
50
60
+/- 1
+/- 2
- 20
+ 10
See on page 4
3,3
5
12
15
+/- 2
25
6
5
2,1
1,65
50
50
60
+/- 1
+/- 2
- 20
+ 10
4
Set Point accuracy
Output power
Output current *
3,3V output
5V output
12V output
15V output
Ripple output voltage
3,3V and 5V output
12V output
15V output
Line regulation
Load regulation
Output Voltage Trim
Efficiency
Maximum admissible
Capacity load
3,3V output
5V output
12V output
15V output
Ui nominal
Full load
BW = 20MHz
Ui min. to max.
Full load
Ui nominal
No load to full load
As function of output
voltage
Ui nominal
Full load
Full input voltage range
Full load
Per output
Maximum
Maximum
Maximum
Maximum
µF
µF
µF
µF
4 700
1 000
330
250
4 700
1 000
330
250
Note * : For 9-36V input range, the current is derated of 80% at 9V and increases linearly to full current at 12V.
©
Gaia Converter FC99-041.01/10 Revision I
3
For locations, phone, fax, E-Mail see back cover
MGDM-26 Series
3- Electrical Characteristics (continued)
86
82
Efficiency (%)
Hi-Rel
Grade
Figure 1 : Typical efficiency versus load
at various input
85
82
Efficiency (%)
Figure 2 : Typical efficiency versus load
at various input
78
74
70
66
input 9V
input 36V
input 20V
79
76
73
70
input 36V
input 20V
input 9V
5
10
20
25
5
10
20
25
Output Power (W)
(MGDS-26-H-C module)
Output Power (W)
(MGDS-26-H-E module)
Figure 3 : Typical efficiency versus load
at various input
83
80
Efficiency (%)
Figure 4 : Typical efficiency versus load
at various input
86
84
Efficiency (%)
82
80
78
76
input 40V
input 28V
input 16V
77
input 40V
74
input 28V
71
input 16V
6.25
12.5
18.75
25
6.25
12.5
18.75
25
Output Power (W)
(MGDS-26-J-B module)
Output Power (W)
(MGDS-26-J-C module)
4
Figure 5 : Typical efficiency versus load
at various input
88
86
Efficiency (%)
Efficiency (%)
Figure 6 : Typical efficiency versus load
at various input
88
86
84
82
80
78
76
input 40V
input 28V
input 16V
84
82
80
78
76
input 40V
input 28V
input 16V
6.25
12.5
18.75
25
6.25
12.5
18.75
25
Output Power (W)
(MGDS-26-J-E module)
Output Power (W)
(MGDS-26-J-F module)
Figure 7 : Typical load regulation
characteristics at nominal input
3,45
3,40
Output Voltage (VDC)
Figure 8 : Typical load regulation
characteristics at nominal input
5,15
5,10
Output Voltage (VDC)
3,35
3,30
3,25
3,20
input 28V
5,05
5,00
4,95
4,90
input 28V
0
8,5
16,5
25
0
8,5
16,5
25
Output Power (W)
(MGDS-26-J-B module)
Output Power (W)
(MGDS-26-J-C module)
©
Gaia Converter FC99-041.01/10 Revision I
4
For locations, phone, fax, E-Mail see back cover
MGDM-26 Series
4- Switching Frequency
Parameter
Switching frequency
Conditions
Full temperature range
Ui min. to max.
No load to full load
Limit or typical
Nominal, fixed
Specifications
1 MHz
Hi-Rel
Grade
5- Isolation
Parameter
Electric strength test voltage
Isolation resistance
Conditions
Input to output
Input to case
Output to case
500 VDC
Limit or typical
Minimum
Minimum
Minimum
Minimum
Specifications
1 500 VDC / 1 min
500 VDC / 1 min
1 500 VDC / 1 min
1 MOhm
6- Protection Functions
Characteristics
Input undervoltage lock-out (UVLO)
Output short circuit protection (SCP)
Protection Device
Turn-on, turn-off circuit
with hysteresis cycle
Hiccup circuitry with
auto-recovery
Recovery
Automatic
recovery
Automatic
recovery
Limit or typical
Turn-on nominal
Turn-off nominal
Permanent
Specifications
See section 3
See section 11
4
7- Reliability Data
Characteristics
Conditions
Ground fixed (Gf)
Mean Time Between Failure (MTBF)
According to MIL-HDBK-217F
Airborne, Inhabited,
Cargo (AIC)
Civilian avionics,
calculator
Temperature
Case at 40°C
Case at 85°C
Case at 40°C
Case at 85°C
Ambient at 55°C
100% time on
Specifications
750 000 Hrs
300 000 Hrs
410 000 Hrs
185 000 Hrs
691 000 Hrs
Mean Time Between Failure (MTBF)
According to IEC-62380-TR
©
Gaia Converter FC99-041.01/10 Revision I
5
For locations, phone, fax, E-Mail see back cover
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