Gaia Converter FC045047.01/10 Revision C
©
REDEFINING THE SOURCE OF POWER
For locations, phone, fax, E-Mail see back cover
Hi-Rel DC/DC CONVERTER
MGDM-35 : 35W POWER Hi-Rel
GradeHi-Rel
Grade
4:1 Wide Input
Single, Bi & Triple Outputs
Metallic Case - 1.500 VDC Isolation
• 28Vdc input compliant with MIL-STD-740A/D/E/F
• Nominal power up to 35 W
• Wide temperature range : -40°C/+105°C case
• High efficiency (typ. 84%)
• Soft start
• Galvanic isolation 1.500 VDC
• Integrated LC input filter
• Permanent short circuit protection
• External synchronisation
• External trim and sense adjustment : +/-5%
• No optocoupler for high reliability
• RoHS or Leaded process option
1-General
2-Product Selection
The MGDM-35 wide input series is a full family of
DC/DC power modules designed for aerospace,
military and high-end industrial applications.
These modules use a high frequency fixed swiching
technic at 250KHz providing excellent reliability,
low noise characteristics and high power density.
Standard models are available with wide input
voltage range of 9-36, and 16-75. The serie
includes single, bi and triple output voltage choices
of 3.3, 5, 12, 15 volts.
No external heatsink is required for the
MGDM-35 series to supply 35W 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.
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
H : 9-36 VDC
O : 16-75 VDC
Transient
40 VDC/100 ms
80 VDC/100 ms
4
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)
Single output model : MGDS - 35 - input output option
/
Bi output model : MGDB - 35 - input output option
/
Triple output model : MGDT - 35 - input output option
/
suffix
suffix
suffix
For locations, phone, fax, E-Mail see back cover
2
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
2- Product Selection (continued)
Current
7 A
7 A
2,9 A
2,3 A
+/- 4 A*
+/- 1,7 A*
+/- 1,3 A*
4 A & +/- 1,1 A*
4 A & +/- 0,9 A*
4 A & +/- 1,1 A*
4 A & +/- 0,9 A*
7 A
7 A
2,9 A
2,3 A
+/- 4 A*
+/- 1,7 A*
+/- 1,3 A*
4 A & +/- 1,1 A*
4 A & +/- 0,9 A*
4 A & +/- 1,1 A*
4 A & +/- 0,9 A*
Reference
MGDS-35-H-B
MGDS-35-H-C
MGDS-35-H-E
MGDS-35-H-F
MGDB-35-H-C
MGDB-35-H-E
MGDB-35-H-F
MGDT-35-H-BE
MGDT-35-H-BF
MGDT-35-H-CE
MGDT-35-H-CF
MGDS-35-O-B
MGDS-35-O-C
MGDS-35-O-E
MGDS-35-O-F
MGDB-35-O-C
MGDB-35-O-E
MGDB-35-O-F
MGDT-35-O-BE
MGDT-35-O-BF
MGDT-35-O-CE
MGDT-35-O-CF
Output
3,3 VDC
5 VDC
12 VDC
15 VDC
+/- 5 VDC
+/- 12 VDC
+/- 15 VDC
3,3 & +/- 11,8 VDC
3,3 & +/- 15,2 VDC
5,1 & +/- 11,8 VDC
5,1 & +/- 14,7 VDC
3,3 VDC
5 VDC
12 VDC
15 VDC
+/- 5 VDC
+/- 12 VDC
+/- 15 VDC
3,3 & +/- 11,7 VDC
3,3 & +/- 14,7 VDC
5,1 & +/- 11,7 VDC
5,1 & +/- 14,7 VDC
Input range
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
16-75 VDC
16-75 VDC
16-75 VDC
16-75 VDC
16-75 VDC
16-75 VDC
16-75 VDC
16-75 VDC
16-75 VDC
16-75 VDC
16-75 VDC
* Note : Indicated values are maximum current on each output with total power not exceeding 35W.
Options
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
/T , /S
Suffix
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
-, -L
Converter Selection Chart
MGDS - 35 - H - C / T - L
Number of Outputs :
S : single output
B : bi ouput
T : triple output
Input voltage range :
H : 9-36 VDC
O : 16-75 VDC
Output voltage :
See table page 1
Option :
/T : -55°C start up operation
/S : screening & serialization
(consult application note
«screening grades»)
Suffix :
nothing : RoHS process
-L : Leaded process
(available in N. America)
For locations, phone, fax, E-Mail see back cover
3
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
3- Electrical Specifications
Data are valid at +25°C, unless otherwise specified.
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 capacior (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.
Parameter Conditions Limit or
typical Units Single Output MGDS-35
35 - H 35 - O
Input
Nominal input voltage Full temperature range Nominal VDC 20 28
Permanent input
voltage range (Ui) Full temperature range Min. - Max. VDC 9-36 16-75
Transient input voltage Full load
(Consult factory) Maximum VDC/S 40/0,1 80/0,1
Undervoltage lock-out
(UVLO)
Turn-on voltage
Turn-off voltage
Nominal
Nominal
VDC
VDC
8,8
8
15,8
14
Start up time
Ui nominal within 3 ms
Nominal output
Full load : resistive
Maximum ms 30 30
Reflected ripple current Ui nominal, full load at
switching freq. BW = 20MHz Maximum mApp 600 600
Input current in short
circuit mode (Average)
Ui nominal
Short-circuit Typical mA TBD TBD
No load input power Ui min. to max.
No load or Stanby Maximum mW 300 500
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
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 35 35
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
7
7
2,9
2,3
7
7
2,9
2,3
Ripple output voltage *
3,3V and 5V output
12V output
15V output
Ui nominal
Full load
BW = 20MHz
Maximum
Maximum
Maximum
mVpp
mVpp
mVpp
100
200
200
100
200
200
Line regulation Ui min. to max.
75% load Maximum % +/- 1 +/- 1
Load regulation ** Ui nominal
25% to full load Maximum % +/- 2 +/- 2
Efficiency Ui nominal
Full load Typical % 83 84
Maximum admissible
Capacitive load
3,3V and 5V output
12V and 15V output
Ui nominal
Full load
Per output Maximum
Maximum
µF
µF
10.000
1.000
10.000
1.000
For locations, phone, fax, E-Mail see back cover
4
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
3- Electrical Specifications (continued)
Data are valid at +25°C, unless otherwise specified.
Parameter Conditions Limit or
typical Units Bi Output MGDB-35
35 - H 35 - O
Input
Nominal input voltage Full temperature range Nominal VDC 20 28
Permanent input
voltage range (Ui) Full temperature range Min. - Max. VDC 9-36 16-75
Transient input voltage Full load
(Consult factory) Maximum VDC/S 40/0,1 80/0,1
Undervoltage lock-out
(UVLO)
Turn-on voltage
Turn-off voltage
Nominal
Nominal
VDC
VDC
8,8
8
15,8
14
Start up time
Ui nominal
Nominal output
Full load : resistive
Maximum ms 30 30
Reflected ripple current Ui nominal, full load at
switching freq. BW = 20MHz Maximum mApp 600 600
Input current in short
circuit mode (Average)
Ui nominal
Short-circuit Typical mA TBD TBD
No load input power Ui min. to max.
No load or Stanby Maximum mW 300 500
Output
Output voltage
Full temperature range
Ui min. to max.
75% load
Nominal
Nominal
Nominal
VDC
VDC
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 +/- 20 +/- 20
Output current *
+/- 5V output
+/- 12V output
+/- 15V output
Full temperature range
Ui min. to max.
Maximum
Maximum
Maximum
A
A
A
+/- 4
+/- 1,7
+/- 1,3
+/- 4
+/- 1,7
+/- 1,3
Ripple output voltage **
5V output
12V output
15V output
Ui nominal
Full load
BW = 20MHz
Maximum
Maximum
Maximum
mVpp
mVpp
mVpp
100
200
200
100
200
200
Line regulation Ui min. to max.
75% load Maximum % +/- 1 +/- 1
Load regulation *** Ui nominal
25% to full load Maximum % +/- 2 +/- 2
Cross load output
regulation
Ui nominal
+ Vout at 75% load
- Vout from 25% to full load
Maximum % +/- 0,5 +/- 0,5
Efficiency Ui nominal
Full load Typical % 84 85
Maximum admissible
Capacitive load
5V output
12V and 15V output
Ui nominal
Full load
Per output Maximum
Maximum
µF
µF
1.000
1.000
1.000
1.000
Note * : Maximum power per output with total power not exceeding 35W.
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
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
3- Electrical Specifications (continued)
Data are valid at +25°C, unless otherwise specified.
Parameter Conditions Limit or
typical Units Tri Output MGDT-35
35 - H 35 - O
Input
Nominal input voltage Full temperature range Nominal VDC 20 28
Permanent input
voltage range (Ui) Full temperature range Min. - Max. VDC 9-36 16-75
Transient input voltage Full load Maximum VDC/-
S40/0,1 80/0,1
Undervoltage lock-out
(UVLO)
Turn-on voltage
Turn-off voltage
Nominal
Nominal
VDC
VDC
8,8
8
15,8
14
Start up time
Ui nominal
Nominal output
Full load : resistive
Maximum ms 30 30
Reflected ripple current Ui nominal, full load at
switching freq. BW = 20MHz Maximum mApp 600 600
Input current in short
circuit mode (Average)
Ui nominal
Short-circuit Typical mA TBD TBD
No load input power Ui min. to max.
No load or Stanby Maximum mW 300 500
Output
Output voltage (1)
Full temperature range
Ui min. to max.
75% load
Nominal
Nominal
Nominal
Nominal
VDC
VDC
VDC
VDC
3,3 & +/-11,8
3,3 & +/-15,2
5,1 & +/- 11,8
5,1 & +/- 14,7
3,3 & +/-11,7
3,3 & +/-14,7
5,1 & +/- 11,7
5,1 & +/- 14,7
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 20 & +/- 14 20 & +/- 14
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
4 & +/- 1,1
4 & +/- 0,9
4 & +/- 1,1
4 & +/- 0,9
4 & +/- 1,1
4 & +/- 0,9
4 & +/- 1,1
4 & +/- 0,9
Ripple output voltage **
3,3V and 5V output
12V output
15V output
Ui nominal
Full load
BW = 20MHz
Maximum
Maximum
Maximum
mVpp
mVpp
mVpp
100
200
200
100
200
200
Line regulation Ui min. to max.
75% oad Maximum % +/- 1 +/- 1
Load regulation *** Ui nominal
25% to full load Maximum % +/- 2 +/- 2
Cross load output
regulation
Ui nominal
+ Vout at 75% load
- Vout from 25% to full load
Maximum % +/- 0,5 +/- 0,5
Efficiency Ui nominal
Full load Typical % 84 85
Maximum admissible
Capacitive load
3,3V and 5V output
12V and 15V output
Ui nominal
Full load
Per output Maximum
Maximum
µF
µF
4.700
470
4.700
470
Note (1) : The primary voltage should be minimum loaded (consult factory) to be able to get the secondary outputs.
Note * : Maximum power per output with total power not exceeding 35W.
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
6
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
3- Electrical Characteristics (continued)
Figure 1 : Typical efficiency versus load
at various input
Efficiency (%)
Output Power (W) (MGDS-35-H-C module)
Figure 2 : Typical efficiency versus load
at various input
Efficiency %)
Output Power (W) (MGDS-35-H-E module)
Figure 3 : Typical efficiency versus load
at various input
Efficiency (%)
Output Power (W) (MGDS-35-H-F module) Output Current (I) (MGDS-35-H-C module)
Figure 5 : Typical load regulation
characteristics at nominal input
Output Voltage (VDC)
Output Current (I) (MGDS-35-H-E module)
Figure 6 : Typical load regulation
characteristics at nominal input
Output Voltage (VDC)
Output Current (I) (MGDS-35-H-F module)
0 5 10 15 20 25
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
0 5 10 15 20 25 30 35 40
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0 5 10 15 20 25 30 35 40
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0,00 1,00 2,00 3,00 4,00 5,00 6,00 7,00 8,00
4,60
4,70
4,80
4,90
5,00
5,10
5,20
5,30
5,40
Figure 4 : Typical load regulation
characteristics at nominal input
input 36V
0,00 0,50 1,00 1,50 2,00 2,50 3,00 3,50
11,80
12,00
12,20
12,40
12,60
12,80
13,00
0,00 0,50 1,00 1,50 2,00 2,50
14,40
14,60
14,80
15,00
15,20
15,40
15,60
15,80
16,00
Efficiency (%)
Output Voltage (VDC)
input 20V
input 9V
input 36V
input 20V
input 9V
input 36V
input 20V
input 9V
For locations, phone, fax, E-Mail see back cover
7
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
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 hysteresis cycle
Automatic
recovery
Turn-on nominal
Turn-off nominal See section 3
Output short circuit protection (SCP) Hiccup circuitry with
auto-recovery
Automatic
recovery Permanent See section 11
Output overvoltage protection (OVP) Overvoltage protection
device with clamping
Automatic
recovery Nominal
Between 105%
and 110% of
output voltage
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 250 KHz
5- Isolation
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
8
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
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.
Cc
Cc
Cc
Cc
BP
BP
MGDM-series
GI
VI Vo
Go
BP
BP
BP: Base Plate
EMI input Filter
Go
Vo
GI
VI
For locations, phone, fax, E-Mail see back cover
9
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
9- Thermal Characteristics
Characteristics Conditions Limit or typical Performances
Operating ambient temperature
range 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 6°C /W
Note * : The upper temperature range depends on configuration, the user must assure a max. case temperature of + 105°C.
10 10030 807060 9020 40 50
25%
75%
50%
100%
Power (W)
Temperature (˚C)
Full load ambient temperature without derating : 70˚C
Maximum case temperature : 105˚C
Natural convection operation area
Additionnal cooling operation area
Maximum storage temperature : 125˚C
The MGDM-35 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
10
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
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
10
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
11
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
11- Description of Protections
11-1 Input Undervoltage Lock-out (UVLO)
An input undervoltage protection will inhibit the module
when input voltage drops below the lock-out turn-off
threshold (see section 3 for value) and restores to normal
operation automatically when the input voltage rises the
lock-out turn-on threshold.
The input undervoltage lock-out threshold (UVLO) can be
trimmed by connecting a resistor between UVLO and Gi
pins. This resistance can be calculated as folow :
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 1s recovery time). The
overload detection threshold is typically 200% of maxi-
mum current with a detection time lower than 5ms.
11-3 Output Overvoltage Protection (OVP)
Each circuit has an internal overvoltage protection circuit
that monitors the voltage accross the output power
terminals.
It is designed to latch the converter off between 105%
and 110% of output voltage.
Once in OVP protection, the module will restart
automatically when overvoltage is removed.
Vin
On
Off
UVLO
UVLO
Turn-on
Turn-off
time
recovery time
detection time
recovery time
x
100
Vo (%)
Input H In put O
K 0,93 2 1,3 4
17
15
Vi
On/Off
Trim
Gi
Vi
Gi 2
5
8
4Vo
Go
Vref
7
RULVO UVLO
1
Sync
6
RUVLO = K x 104 where n = UVLO trim
(n - 1) UVLOthreshold
For locations, phone, fax, E-Mail see back cover
12
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
12- Description of Functions
12-1 Trim Function
The output voltage Vo may be trimmed in a range of 95%/
105% of the nominal output voltage via a single external
trimpot or fixed resistor.In case of dual or triple outputs, the
trim function is also acting on the secondary outputs.
Trim Up Function
Do not attempt to trim the module higher than 105% of nomi-
nal output voltage as the overvoltage protection may occur.
Also do not exceed the maximum rated output power when
the module is trimmed up.
The trim up resistor must be connected to Vref pin.
The trim up resistance must be calculated with the following
formula :
Trim Down Function
Do not trim down more than 95% of nominal output voltage.
The available output power is reduced by the same percentage
that output voltage is trimmed down.
The trim down resistor must be connected to Gi pin.
The trim down resistance must be calculated with the following
formula :
Trim via a voltage
The output voltage is given by the following formula :
17
15
Vi
On/Off
Trim
Gi
Vi
Gi 2
5
8
4Vo
Go
Vref
7
Ru
UVLO
1
Sync
6
Vo = Vo (0.0565 V + 0.887)
nom control
17
15
Vi
Gi 2
5
8
4Vo
Go
7
RD
Vi
On/Off
Trim
Gi
Vref
UVLO
1
Sync
6
17
15
Vi
On/Off
Gi
Vi
Gi 2
1
8
4Vo
Go
7
Vcontrol
Sync
Trim
UVLO
Vref
6
5
+
-
For locations, phone, fax, E-Mail see back cover
13
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
12- Description of Functions (continued)
12-2 On/Off Function
The control pin 8 (On/Off) can be used for applications requiring
On/Off operation. This may be done with an open collector
transistor, a switch, a relay or an optocoupler. Several
converters may be disabled with a single switch by connecting
all
On/Off pins together.
• The converter is disabled by pulling low the pin 8.
• No connection or high impedance on pin 8 enables the
converter.
By releasing the On/Off function, the converter will restart
within the start up time specifications given in table section
3. For further details please consult ‘’Logic On/Off’’ application note.
12-3 Synchronization Function
An external clock with rectangular «Pull Up» signals can be
used to lock one or more converters. The external clock si-
gnal should have a frequency range from 550KHz to 600KHz,
a low level below 0,5V a high level of 4V (+/-0.5V), a rise
time of 30 ns max. and a drop time of 100ns max.
Parameter Unit Min. Typ. Max. Notes, conditions
On/Off module enable voltage Vdc 3 / 4 Open, the switch must not sink more than 100µA
On/Off module disable voltage Vdc 0 / 1.5 The switch must be able to sink 1mA
On/Off module enable delay ms / / 30 /
On/Off module disable delay µs / / 100 Vin nominal at full load
17
15
Vi
On/Off
Trim
Gi
Vi
Gi 2
5
8
4Vo
Go
Vref
7
UVLO
1
Sync
6
Synch bus
12-4 Reference function (Vref)
The Vref signal output provides a stable 4V (±0.1 V)
reference signal on Vref pin. It is protected by an internal
10 kohms resistor. This signal may be used also in
conjunction with the Trim input pin 5 (primary side).
It is recommended to connect a filter capacitor (10nF)
between Vref and Gi, if Vref is used.
GI
On/Off
Command
For locations, phone, fax, E-Mail see back cover
14
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
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 out-
put and the common load.
Go
+Vo
-VoGI
VI
2 x Vo
Go
Vo
GI
VI
Go
Vo
GI
VI
Vo
Go
Vo
GI
VI
Go
Vo
GI
VI
2 x Vo
For locations, phone, fax, E-Mail see back cover
15
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
14- PCB Mounting Specifications
The MGDM-35 series has been design for low profile applications.
Two levels of mounting can be designed :
• On-board mounting with 12,5 mm height
• In-board mounting with 10,5 mm height and PCB hole design on the mother board
Inboard Mounting
Onboard Mounting
For locations, phone, fax, E-Mail see back cover
16
MGDM-35 Series
Gaia Converter FC05-047.01/10 Revision C
©
Hi-Rel
Grade
4
4
15- Dimensions
Dimension are given in mm (inches). Tolerance : +/- 0,2 mm (+/- 0.01 “) unless otherwise indicated.
Weight : 80 grams (2.80 Ozs) max.
18- Connections
Pin dimensions : 0,91 mm (0.036")
63,50 (2.50")
10,5
(0.41")
12,50
(0.50")
20
(0.79")
3
(0.12")
R2
82,50 (3.25")
76,90 (3.02") 4 holes 3,3
42,90
(1.69")
35,56
(1.4")
48,50
(1.91")
23,35 (0.92")23,35 (0.92")
1
2
3
4
13
15
17
11
5
6
7
8
9,5 +/-0,4
(0.37")
3,20
(0.13")
18,20
(0.71")
3,93 +/-0,4
(0.15")
.
.
.
.
.
.
.
.
.
8 x 5,08
(8 x 0.20")
1
2
3
4
13
15
17
11
5
6
7
8
Pin Single Bi Triple
1 UVLO UVLO UVLO
2 - Input (Gi) - Input (Gi) - Input (Gi)
3 Do not connect Do not connect Do not connect
4 + Input (Vi) + Input (Vi) + Input (Vi)
5 Trim Trim Trim
6 Synchro (Sync) Synchro (Sync) Synchro (Sync)
7 Vref Vref Vref
8 On / Off On / Off On / Off
11 Do not connect Output - (-Vo) Output 2- (-V2)
13 Do not connect Do not connect Output 2+ (+V2)
15 Common (Go) Common (Go) Common (Go)
17 Output (Vo) Output + (+Vo) Output 1 (V1)
Bottom view
16- Materials
Case : Metallic black anodized coating.
Pins : Plated with pure matte tin over nickel underplate.
17- Product Marking
Upper face : Company logo, location of manufacturing.
Side face : Module reference : MGDx-35-»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 Gaia Converter FC04-035.01/10 Revision C. 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