ETC2 MGDM-75 Hi-rel dc/dc converter 75w power Datasheet

Hi-Rel DC/DC CONVERTER
MGDM-75 : 75W POWER
Hi-Rel
Grade
5:1 Ultra Wide Input
Single Output
Metallic case - 1.500 VDC Isolation
• Ultra wide input range 16-80 Vdc, 9-45 Vdc
• 28Vdc input compliant with MIL-STD-704A/D/F
• Industry standard quarter brick package
• Power up to 75 W
• Wide temperature range : -40°C/+ 105° baseplate
• High efficiency (typ. 86%-90%)
• Soft start
• Galvanic isolation 1.500 VDC
• Integrated LC EMI filter
• Synchronizable
• Fully protected by independant security
• Under & overvoltage lock-out
• Overvoltage protection
• Current limitation protection
• Overtemperature protection
• No optocoupler for high reliability
1-General
The MGDM-75 series is a complete line of high
density wide input range DC/DC power modules
designed for aerospace, military and high-end
industrial applications. These modules use a
patented fixed switching topology at 420 KHz
providing ultra wide input range, low noise
characteristics and high power density. Standard
models are available with ultra wide input voltage range of 9-45, 16-80 volts. The series
include single output voltage choices of 3.3, 5,
12, 15, 24, 28 volts.
The MGDM-75 series include synchronization, trim
and sense functions.
The synchronization function allows to synchronize
more than one converter to one frequency or an
external source frequency.
All the modules are designed with LC network
filters to minimize reflected input current ripple
and output voltage ripple.
The modules have totally independant security
functions including input undervoltage lock-out,
output overvoltage protection, output current
limitation protection, and temperature protection. Additionnally a soft-start function allows
current limitation and eliminates inrush current
during start-up.
The design has been carried out with surface
mount components, planar transformer and is
manufactured in a fully automated process to
guarantee high quality. The modules are potted
with a bi-component thermal conductive
compound and used an insulated metallic substrat to ensure optimum power dissipation under
harsh environmental conditions.
2-Product Selection
Single output model
: MGDS-75-
(/T) and/or (/S)
(/T) : option for -55°C start up operating temperature
(/S) : option for screening and serialization
Input Voltage Range
Permanent
H : 9-45 VDC
O : 16-80 VDC
Output
B
C
E
F
I
J
:
:
:
:
:
:
REDEFINING THE SOURCE OF POWER
© Gaia Converter FC03-032.03/06 Revision G
For locations, phone, fax, E-Mail see back cover
3.3 VDC
5 VDC
12 VDC
15 VDC
24 VDC
28 VDC
4
Hi-Rel
Grade
MGDM-75 Series
2- Product Selection (continued)
Input range
Output
Current
Reference
Options
9-45
9-45
9-45
9-45
9-45
9-45
VDC
VDC
VDC
VDC
VDC
VDC
3.3 VDC
5 VDC
12 VDC
15 VDC
24 VDC
28 VDC
15 A
12,5 A
6,25 A
5A
3,125 A
2,7 A
MGDS-75-H-B
MGDS-75-H-C
MGDS-75-H-E
MGDS-75-H-F
MGDS-75-H-I
MGDS-75-H-J
/T
/T
/T
/T
/T
/T
,
,
,
,
,
,
/S
/S
/S
/S
/S
/S
16-80
16-80
16-80
16-80
16-80
16-80
VDC
VDC
VDC
VDC
VDC
VDC
3.3 VDC
5 VDC
12 VDC
15 VDC
24 VDC
28 VDC
15 A
15 A
6,25 A
5A
3,125 A
2,7 A
MGDS-75-O-B
MGDS-75-O-C
MGDS-75-O-E
MGDS-75-O-F
MGDS-75-O-I
MGDS-75-O-J
/T
/T
/T
/T
/T
/T
,
,
,
,
,
,
/S
/S
/S
/S
/S
/S
4
Converter Selection Chart
M G D S - 75 - O - E / T
Number of Outputs :
S : single output
Input voltage range :
H : 9-45 VDC
O : 16-80 VDC
Output voltage :
See table page 1
Option :
(/T) : -55°C start up
(/S) : screening and
serialization (consult
application note
«screening grades»)
© Gaia Converter FC03-032.03/06 Revision G
2
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MGDM-75 Series
Hi-Rel
Grade
3- Block Diagram
The MGDM-75 DC/DC converter is based on a constant 420KHz pulse-width modulated forward topology
designed for ultra large input range.
As this auxilliary power is independent from the main
power supply, the module features a wide trim
windows from 90% to 110% of the nominal output
voltage.
The output voltage is monitored on the secondary
side avoiding the use of optocoupler to optimize
long-term reliability and provide good immunity
against radiations.
The main power transformer designed for more than
75W power is a multi-layer planar transformer which
allows 100% reproductibility for optimized module
efficiencies.
An auxilliary supply is implemented to feed
independently all security functions such as the input
undervoltage lock-out (UVLO), the output overload
protection (OCP), the ouput overvoltage protection
(OVP) and the thermal protection (OTP).
Vin
LC input
filter
The controlled feedback regulation is located at the
secondary side allowing a high regulation bandwidth
and a very fast response to load changes.
LC output
filter
POWER STAGE
Vo
4
UVLO
Current
Sense
On/Off
Auxilliary
supply
Mosfet
Driver
OVP
Feed-back
function
Control circuit
Sync
Sense
Trim
Thermal
Shutdown
Isolation Barrier
© Gaia Converter FC03-032.03/06 Revision G
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MGDM-75 Series
Hi-Rel
Grade
4- Electrical Specifications
Data are valid at +25°C, unless otherwise specified.
Parameter
Conditions
Limit or
typical
Units
Full temperature range
Nominal
Full temperature range
Turn-on voltage
Turn-off voltage
Ui nominal
Nominal output
Full load : resistive
Ui nominal, full load
BW = 20MHz
Ui nominal
Short-circuit
Ui nominal
No load
Ui nominal
Inhibit
Single Output MGDS-75
75 - H
75 - O
VDC
24
28
Min. - Max.
VDC
9 - 45
16 - 80
Nominal
Nominal
VDC
VDC
8,5
7,5
15,5
14,5
Maximum
ms
30
30
Maximum
mApp
500
500
Typical
A
1
0,2
Maximum
mA
30
30
Maximum
mA
10
10
Nominal
Nominal
Nominal
Nominal
Nominal
Nominal
VDC
VDC
VDC
VDC
VDC
VDC
3,3
5
12
15
24
28
3,3
5
12
15
24
28
Maximum
%
+/- 2
+/- 2
Maximum
W
50 to 75
50 to 75
Maximum
Maximum
Maximum
Maximum
Maximum
Maximum
A
A
A
A
A
A
15
12,5
6,25
5
3,125
2,7
15
15
6,25
5
3,125
2,7
Typical
Typical
Typical
Typical
mVpp
mVpp
mVpp
mVpp
50
100
150
250
50
100
150
250
Ui min. to max.
0% to full load
Maximum
%
+/- 1
+/- 1
Output Voltage Trim
As function of output voltage
Minimum
Maximum
%
%
90 **
110
90 **
110
Efficiency
Ui nominal
Full load
Typical
%
Please consult factory
Input
Nominal input voltage
Permanent input
voltage range (Ui)
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 *
Set Point accuracy *
Output power
Output current
3,3V output
5V output
12V output
15V output
24V output
28V output
Ripple output voltage
3,3V and 5V output
12V output
15V output
24V and 28V output
Output regulation *
(Line + load + thermal)
Ui min. to max.
Ambient temperature : +25°c
Ui nominal, 75% load
At 105°c baseplate
Ui min. to max.
Full temperature range
Ui min. to max.
Ui nominal
Full load
BW = 20MHz
4
Note * : These performances are measured with the sense line connected..
Note ** : It is recommended to mount the converter on a heatsink for this test, see section 10-3 and 10-9 for further details.
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 4 external decoupling capacitors connected between inputs and case and between outputs and case. These capacitance should
be layed-out as close as possible from the converter. Please refer to page 8 for more details.
© Gaia Converter FC03-032.03/06 Revision G
4
For locations, phone, fax, E-Mail see back cover
Hi-Rel
Grade
MGDM-75 Series
4- Electrical Characteristics (continued)
Typical efficiency MGDS75HB at 25°C
Typical efficiency MGDS75HC at 25°C
83%
83%
80%
80%
78%
78%
75%
75%
10W
20W
30W
40W
50W
73%
70%
68%
70%
68%
65%
65%
63%
63%
60%
15W
30W
45W
60W
75W
73%
60%
5
10
15
20
25
30
35
40
45
5
10
15
Input voltage Vin (Vdc)
Typical efficiency MGDS75HE at 25°C
86%
84%
82%
80%
15W
30W
78%
45W
60W
75W
76%
74%
72%
70%
68%
10
15
20
25
30
35
25
30
35
40
45
Typical efficiency MGDS75HF at 25°C
88%
5
20
Input voltage Vin (Vdc)
40
89%
88%
87%
86%
85%
84%
83%
82%
81%
80%
79%
78%
77%
76%
75%
74%
73%
45
15W
30W
4
45W
60W
75W
5
10
15
20
25
30
35
40
45
Input voltage Vin (Vdc)
Input voltage Vin (Vdc)
Typical efficiency MGDS75HJ at 25°C
88%
85%
83%
80%
78%
15W
30W
75%
73%
70%
45W
60W
68%
75W
65%
63%
60%
58%
5
10
15
20
25
30
35
40
45
Input voltage Vin (Vdc)
© Gaia Converter FC03-032.03/06 Revision G
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Hi-Rel
Grade
MGDM-75 Series
4- Electrical Characteristics (continued)
Typical efficiency MGDS75OC at 25°C
86%
85%
84%
83%
82%
81%
80%
79%
78%
77%
76%
75%
74%
73%
72%
71%
15W
30W
45W
60W
75W
10
20
30
40
50
60
70
80
Input voltage Vin (Vdc)
Typical efficiency MGDS75OE at 25°C
88%
86%
84%
82%
80%
4
15W
30W
78%
45W
60W
75W
76%
74%
72%
70%
68%
10
20
30
40
50
60
70
80
Input voltage Vin (Vdc)
Typical efficiency MGDS75OI at 25°C
Typical efficiency MGDS75OJ at 25°C
90%
90%
88%
88%
85%
85%
83%
80%
83%
15W
30W
80%
15W
30W
73%
45W
60W
78%
45W
60W
70%
75W
75%
75W
78%
75%
68%
73%
65%
70%
63%
60%
68%
10
20
30
40
50
60
70
80
10
20
Input voltage Vin (Vdc)
© Gaia Converter FC03-032.03/06 Revision G
30
40
50
60
70
80
Input voltage Vin (Vdc)
6
For locations, phone, fax, E-Mail see back cover
Hi-Rel
Grade
MGDM-75 Series
5- Switching Frequency
Parameter
Conditions
Limit or typical
Specifications
Switching frequency
Full temperature range
Ui min. to max.
No load to full load
Nominal, fixed
420 KHz
Parameter
Conditions
Limit or typical
Specifications
Electric strength test voltage
Input to output
Input to case
Output to case
Minimum
Minimum
Minimum
1.500 VDC / 1 min
1.500 VDC / 1 min
1.500 VDC / 1 min
Isolation resistance
500 VDC
Minimum
100 MOhm
6- Isolation
7- 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 4
Output current limitation protection
(OCP)
Straight line current
limitation
Automatic
recovery
Nominal
110% of
output current
Output overvoltage protection (OVP)
Overvoltage protection
device with latch-up
Automatic
recovery
Nominal
120% of
output voltage
Over temperature protection (OTP)
Thermal device with
hysteresis cycle
Automatic
recovery
Nominal
115°C
4
8- Reliability Data
Characteristics
Mean Time Between Failure (MTBF)
According to MIL-HDBK-217F
Mean Time Between Failure (MTBF)
According to IEC-62380-TR
© Gaia Converter FC03-032.03/06 Revision G
Conditions
Temperature
Specifications
Ground fixed (Gf)
Case at 40°C
Case at 85°C
700.000 Hrs
190.000 Hrs
Airborne, Inhabited,
Cargo (AIC)
Case at 40°C
Case at 85°C
390.000 Hrs
125.000 Hrs
Avionics Military Cargo
/
Consult factory
7
For locations, phone, fax, E-Mail see back cover
Hi-Rel
Grade
MGDM-75 Series
9- 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.
MIL-STD-461C
Standard
MIL-STD-461D/E
Standard
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
compliant with additionnal filter
Radiated emission (RE) :
Magnetic field
Electrical field
RE 01
RE 02
RE 101
RE 102
compliant module stand-alone
compliant module stand-alone
Radiated susceptibility (RS) :
Magnetic field
Electrical field
RS 01
RS 03
RS 101
RS 103
compliant module stand-alone
compliant module stand-alone
Standard Requirements
Compliance Description
Applicability
See section 8-1
H, O input module
Compliance with GAIA Converter
Module & common mode capacitance
See section 8-1
H, O input module
see also EMI design notes
4
9-1 Module Compliance with MIL-STD-461C/D/E Standards
To meet MIL-STD-461D/E (and also MIL-STD-461C) requirements and in particular CE102 (and also CE03) requirements, Gaïa
Converter recommends the use of the following front filter together with 4 external decoupling capacitors connected between
inputs and case and between outputs and case. Please consult EMI filter design note for further details.
Cc
LMC1
LMC2
C2
C1
R1
VI
C6
C4
C3
C7
Vo
R2
MGDM-series
C8
C5
Cc
BP
BP
C9
GI
Go
BP
BP
Cc
Cc
BP: Base Plate
LMC1, LMC2 .............. :
C1, C4, C8 ............. :
C2, C3, C6, C7 ........ :
C5, C9 .................. :
R1, R2 .................. :
Cc *...................... :
Common mode chokes (consult EMI design note for details)
Ceramic capacitors (consult EMI design note for details)
Ceramic capacitors 10nF
Optionnal electrolytic capacitors (consult EMI design note for details)
Optionnal resistors (consult EMI design note for details)
Common mode noise capacitor 10nF
(*) Must be placed as close as possible to the converter in order to reduce the path length or the connections to the pins and the baseplate.
© Gaia Converter FC03-032.03/06 Revision G
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Hi-Rel
Grade
MGDM-75 Series
10- Thermal Characteristics
Characteristics
Conditions
Limit or typical
Performances
Operating ambient temperature range
at full load
Ambient temperature *
Minimum
Maximum
- 40°C
see section 10-9
Baseplate temperature
Base plate temperature
Minimum
Maximum
- 40°C
+ 105°C
Storage temperature range
Non functionning
Minimum
Maximum
- 55°C
+ 125°C
Thermal resistance
Baseplate to ambient
Rth(b-a) free air
Typical
11°C/W
Note * : The upper temperature range depends on configuration, the user must assure a max. baseplate temperature of + 105°C.
The MGDM-75 series maximum baseplate temperature at
full load must not exceed 105°C. Heat can be removed
from the baseplate via three basic
mechanisms :
• Radiation transfert : radiation is counting for less
than 5% of total heat transfert in majority of case, for
this reason the presence of radient cooling is used as
a safety margin and is not considered.
To calculate a maximum admissible ambient temperature
the following method can be used.
Knowing the maximum baseplate temparature Tbase =
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 :
η - 1) (A)
Pdiss = Pout(1/η
• determine the maximum ambient temperature :
Ta = 105°C - Rth(b-a) x Pdiss (B)
• Conduction transfert : in most of the applications,
heat will be conducted from the baseplate into an
attached heatsink or heat conducting member; heat is
conducted thruthe interface.
• Convection transfert : convecting heat t r a n s f e r
into air refers to still air or forced air cooling.
In majority of the applications, heat will be removed from
the baseplate either with :
• heatsink,
• forced air cooling,
• both heatsink and forced air cooling.
where Rth(b-a) is the thermal resistance from the
baseplate to ambient.
This thermal Rth(b-a) resistance is the summ of :
• the thermal resistance of baseplate to heatsink
(Rth(b-h)). The interface between baseplate and
heatsink can be nothing or a conducting member, a
thermal compound, a thermal pad.... The value of
Rth(b-h) can range from 0.4°C/W for no interface down
to 0.1°C/W for a thermal conductive member interface.
• the thermal resistance of heatsink to ambient air
(Rth(h-a)), which is depending of air flow and given
by heatsink supplier.
4
The table hereafter gives some example of thermal resistance for different heat transfert configurations.
Heat transfert
Thermal resistance heatsink to air Rth(h-a)
No Heatsink baseplate only :
Free air cooling
only
Forced air cooling
200 LFM
Forced air cooling
400 LFM
No need of thermal pad
11°C/W
7,64°C/W
Berquist Silpad* :
0,21°C/W
7,85°C/W
Heatsink Thermaflo 424800B0000 :
3,5°C/W
Berquist Silpad* :
0,21°C/W
3,71°C/W
No Heatsink baseplate only :
6,9°C/W
No need of thermal pad
Heatsink Radian HS1568EX :
3,5°C/W
Berquist Silpad* :
0,21°C/W
3,71°C/W
Heatsink Thermaflo 424800B0000 :
2,8°C/W
Berquist Silpad* :
0,21°C/W
3,01°C/W
No Heatsink baseplate only :
4,8°C/W
No need of thermal pad
Heatsink Radian HS1568EX :
2°C/W
Berquist Silpad* :
0,21°C/W
2,21°C/W
1,80°C/W
Berquist Silpad* :
0,21°C/W
2,01°C/W
No Heatsink baseplate only :
Heatsink Thermaflo 424800B0000 :
2,8°C/W
1°C/W
6,9°C/W
4,8°C/W
No need of thermal pad
Berquist Silpad* :
Radian and Thermaflo are heasink manufacturers. «Silpad» © is a registered trademark of Berquist.
Note* : Silpad performance are for Silpad 400 with pressure conditions of 50 Psi. Surface of MGDS-150 series is 3,3 inch2.
© Gaia Converter FC03-032.03/06 Revision G
Global
resistance
Heatsink Thermaflo 424500B0000 :
Heatsink Thermaflo 424800B0000 :
Forced air cooling
1000 LFM
11°C/W
Thermal resistance baseplate to
heatsink
For locations, phone, fax, E-Mail see back cover
2,8°C/W
0,21°C/W
1,21°C/W
9
MGDM-75 Series
Hi-Rel
Grade
10- Thermal Characteristics (continued)
The two formulas (A) and (B) described in previous page :
• Pdiss = Pout(1/η
η - 1)
In particular, as example the following typical curves are
calculated with :
(A)
• no heatsink
• Ta = 105°C - Rth(b-a) x Pdiss (B)
conduct to curves determining the ambient temperature
admissible as a function of output power for various heat
transfert conditions.
• a Thermaflo heatsink reference 424800B0000 and a
Berquist «Silpad» for various cooling conditions.
MGDS-75-H-x Series Thermal Curves
75
70
Output power (W)
65
60
55
50
45
40
no heatsink
no heatsink 200LFM
no heatsink 400 LFM
heatsink 1000 LFM
heatsink
heatsink 200 LFM
heatsink 400 LFM
heatsink 1000 LFM
35
30
25
20
15
4
10
5
0
0
10
20
30
40
50
60
70
80
Ambient temperature (°C)
90
100
110
MGDS-75-O-x Series Thermal Curves
Output power (W)
75
70
65
60
55
50
no heatsink
no heatsink 200LFM
no heatsink 400 LFM
45
40
35
heatsink
heatsink
heatsink
heatsink
heatsink
30
25
20
15
10
5
1000 LFM
200 LFM
400 LFM
1000 LFM
0
0
© Gaia Converter FC03-032.03/06 Revision G
10
20
30
40
50
60
70
80
Ambient temperature (°C)
90
100
110
10
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MGDM-75 Series
Hi-Rel
Grade
11- Environmental Qualifications
The modules have been subjected to the following environmental qualifications.
Characteristics
Conditions
Severity
Test procedure
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
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
Climatic Qualifications
Life at high
temperature
4
Mechanical Qualifications
© Gaia Converter FC03-032.03/06 Revision G
11
For locations, phone, fax, E-Mail see back cover
Hi-Rel
Grade
MGDM-75 Series
12- Description of Protections
The MGDM-75 series include 3 types of protection devices that
are powered and controlled by a fully independant side power
stage.
12-1 Input Undervoltage Lockout (UVLO)
12-1-1 Undervoltage Lockout (UVLO)
An undervoltage protection will inhibit the module when input
voltage drops below the lockout turn-off threshold (see section 4 for value) and restores to normal operation automatically
when the input voltage rises the lockout turn-on threshold.
On
Off
Vin
UVLO UVLO
Turn-off Turn-on
12-2 Output Over Current Protection (OCP)
Vout
The MGDM-75 Series incorporates a staight line current limit
and protection circuit. When the output current reaches 110%
of it’s full-rated current (Icurrent limit), the output voltage
falls and output current falls along the vertical line as described
in the figure herein. The module restart automatically to normal operation when overcurrent is removed.
4
Icurrent limit
110% of full 130% of full
rated current rated current
12-3 Output Overvoltage Protection (OVP)
Iout
Each circuit has an internal overvoltage protection circuit that
monitors the voltage accross the output power terminals.
It is designed to turn the converter off at 120%
(+/-5%) of output voltage.
Once in OVP protection, the module will restart automatically
when overvoltage is removed.
12-4 Over Temperature Protection (OTP)
A thermal protection device adjusted at 115°C (+/-5%) internal
temperature with 10°C hysteresis cycle will inhibit the module as long as the overheat is present and restores to normal operation automatically when overheat is removed. The
efficiency of the OTP function is warranty with the module
mounted on a heatsink.
On
Off
10˚c
115˚c
© Gaia Converter FC03-032.03/06 Revision G
Baseplate
Temperature
12
For locations, phone, fax, E-Mail see back cover
Hi-Rel
Grade
MGDM-75 Series
13- Description of Functions
13-1 Trim Function
The output voltage Vo may be trimmed in a range of
90%/110% of the nominal output voltage via a single external
trimpot or fixed resistor.
Trim Up Function
Do not attempt to trim the module higher than 110% of
nominal 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 S+ pin.
The trim up resistance must be calculated with the following
formula :
4 Vin
3
Vo 5
MGDM75
S+ 6
On/Off
Ru
Error amp.
2
Sync
Trim 7
R1
R2
Vref=
2.5V
1µF
Load
S- 8
Go 9
1 Gin
Ru = R1 (V0-Vref)V0nom - R1 - R2
(V0-V0nom)Vref
Trim Down Function
Do not trim down more than -10% 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 S- pin.
The trim down resistance must be calculated with the
following formula :
Rd = (R2 + R1)V0- R2V0nom
V0nom - V0
4 Vin
Trim via a voltage
4 Vin
3
Vo 5
MGDM75
S+ 6
On/Off
Error amp.
2
Sync
Trim 7
R1
R2
Vref=
2.5V
1µF
3
Vo 5
MGDM75
S+ 6
On/Off
Ru
Error amp.
2
S- 8
Go 9
1 Gin
The output voltage is given by the following formula :
V0 = 1 +
R1 (Vtrim - 1)
(R1 + R2) Vref
Sync
Trim 7
R1
R2
Vref=
2.5V
1µF
1 Gin
100nF
Vcontrol
S- 8
Go 9
Unit
Min.
Typ.
Max.
Trim reference
Vdc
2,45
2,5
2,55
Resistor R1
Ohm
/
3800
/
Resistor R2
Ohm
/
270
/
µF
/
1
/
© Gaia Converter FC03-032.03/06 Revision G
Load
BAT54
Parameter
Trim capacitor
4
Load
Rd
13
For locations, phone, fax, E-Mail see back cover
Hi-Rel
Grade
MGDM-75 Series
13- Description of Functions (continued)
13-2 Sense Function
If the load is separated from the output by any line lenght,
some of these performance characteristics will be degraded
at the load terminals by an amount proportional to the
impedance of the load leads. Sense connections enable to
compensate the line drop at a maximum of +/-10% of output
voltage. The overvoltage protection will be activated and module
will shut down if remote sense tries to boost output voltage
above 110% of nominal output voltage. Connection is described
in figure herein.
4 Vin
3
Vo 5
MGDM75
On/Off
S+ 6
Trim 7
2
Load
S- 8
Sync
Go 9
1 Gin
13-3 On/Off Function
The control pin 3 (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 3.
• 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 section
3. For further details please consult ‘’Logic On/Off’’ application note.
4 Vin
Vi
3
BP
Vo 5
S+ 6
On/Off
7
MGDM75 Trim
On/Off
2
S- 8
Go 9
Sync
1 Gin
Gi
Load
4
Parameter
Unit
Min.
Typ.
Max.
Notes, conditions
On/Off module enable voltage
Vdc
2
/
4,5
Open, the switch must not sink more than 100µA
On/Off module disable voltage
Vdc
0
/
0.5
The switch must be able to sink 1mA
On/Off module enable delay
ms
/
/
30
The module restarts with the same delay after alarm mode
removed
On/Off module disable delay
µs
/
/
100
Vi nominal, full load
13-4 Synchronization Function
An external clock with rectangular «Pull Up» signals can be
used to lock one or more converters. The external clock signal should have a frequency range from 860KHz to 940KHz,
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..
4 Vin
Vi
3
On/Off
Vsync
2
1N4148
Gi
4V
+/- 0,5
0V
30ns
max
Vo 5
S+ 6
7
MGDM75 Trim
100pF
Ext. clock
Totem pole
output
BP
Sync
4.7k
1 Gin
Load
S- 8
Go 9
Vin
T/2
100ns
max
© Gaia Converter FC03-032.03/06 Revision G
T
( 860Khz < F < 940Khz )
14
For locations, phone, fax, E-Mail see back cover
Hi-Rel
Grade
MGDM-75 Series
14- Application Notes
14-1 Synchronization of Modules
The MGDM-75 series provides a synchronization function
trough the pin 2 (Synchro) to enable automatic synchronisation between several converters.
If several converters are used, they lock themselves into
the highest switching frequency.
The synchronization signal available on pin 2 is referenced
to ground in (Gi) and the signal shape is the double of the
switching frequency (i.e 2x420KHz). It is a rectangular
signal with 3.5 Vp (+/-0.5V) amplitude with an impedance
of 4,7 KOhm on low level.
10nF
10nF
4 Vin
3
BP
Vo 5
S+ 6
On/Off
MGDM75 Trim 7
2
S- 8
Go 9
Sync
1 Gin
BP
10nF
10nF
(*)
10nF
10nF
4 Vin
3
BP
Vo 5
S+ 6
On/Off
MGDM75 Trim 7
On/Off
2
S- 8
Go 9
Sync
1 Gin
BP
10nF
10nF
(*) BP: Base Plate
4
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 voltages do not rise at the same time.
10nF
10nF
4 Vin
3
BP
Vo 5
S+ 6
On/Off
100µF
MGDM75 Trim 7
2
S- 8
Go 9
Sync
1 Gin
BP
10nF
10nF
(*)
10nF
10nF
4 Vin
3
BP
Vo 5
S+ 6
On/Off
100µF
MGDM75 Trim 7
2
S- 8
Go 9
Sync
1 Gin
10nF
BP
10nF
(*) BP: Base Plate
© Gaia Converter FC03-032.03/06 Revision G
15
For locations, phone, fax, E-Mail see back cover
MGDM-75 Series
Hi-Rel
Grade
11- Dimensions
0.5 (0,019)
9,894
(0.39)
Uncoated
metal header
Use this side
for heat sinking
,4
R2
26,16 (1.03)
36,83 (1.45)
CH 2x2
57,912 (2.28)
3,56 (0.14)
3,56 (0.14)
47,24 (1.86)
50,8 (2.00)
9,589
(0.38)
3,81 (0.15)
3,81 (0.15)
10,795
(0.425)
3,81 (0.15)
Mouting Hole
0 3,1 (0.122)
3,81 (0.15)
Dimensions are given in mm (inches). Tolerance : +/- 0,2 mm (+/- 0.01 “) unless otherwise indicated.
Weight : 70 grams (1.95 Ozs) max.
)
.1
(0
12.7 Max
(0,5)
Pin dimensions :
Pin 1, 2, 3, 4, 7, 8 : Ø 1 mm (0.04”)
Pin 5, 9 : Ø 1,5 mm (0.059”)
5.6 min
(0,22)
6.8 max
(0,267)
4
12- Product marking
Side face : Company logo, module reference,
Date code : year and week of manufacturing
13- Connections
9
1
8
2
7
6
3
5
Pin
Single Output
1
- Input (Gi)
2
Synchro (Sync)
3
On/Off
4
+ Input (Vi)
5
+ Output (Vo)
6
Sense + (S+)
7
Trim (Trim)
8
Sense - (S-)
9
- Output (Go)
4
Bottom view
© Gaia Converter FC03-032.03/06 Revision G
16
For locations, phone, fax, E-Mail see back cover
International Headquarters
Marketing and Sales department
GAÏA Converter - France
Address : B.P. 26 - 33186 LE HAILLAN - FRANCE
Tel. : + (33)-5-57-92-12-80
Fax : + (33)-5-57-92-12-89
North American Headquarters
GAÏA Converter Canada, Inc
Address : 6611 Thissen
ST-LAURENT, QUEBEC - CANADA H4S 1W2
Tel. : (514)-333-3169
Fax : (514)-333-4519
Represented by :
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 FC03-032.03/06 Revision G Graphisme : Philippe Clicq
For more detailed specifications and applications information, contact :
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