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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 : -40C/+ 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.
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2-Product Selection
Single output model : MGDS-75(/T) and/or (/S)
(/T) : option for -55C start up operating temperature (/S) : option for screening and serialization Input Voltage Range Permanent H : 9-45 VDC O : 16-80 VDC B C E F I J Output : : : : : : 3.3 VDC 5 VDC 12 VDC 15 VDC 24 VDC 28 VDC
REDEFINING THE SOURCE OF POWER
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MGDM-75 Series 2- Product Selection (continued)
Hi-Rel Grade
Input range
Output
Current
Reference
Options
9-45 9-45 9-45 9-45 9-45 9-45 16-80 16-80 16-80 16-80 16-80 16-80
VDC VDC VDC VDC VDC VDC VDC VDC VDC VDC VDC VDC
3.3 VDC 5 VDC 12 VDC 15 VDC 24 VDC 28 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 15 A 15 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 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 /T /T /T /T /T /T
, , , , , , , , , , , ,
/S /S /S /S /S /S /S /S /S /S /S /S
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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) : -55C start up (/S) : screening and serialization (consult application note screening grades)
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MGDM-75 Series 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. 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. 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).
Hi-Rel Grade
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 main power transformer designed for more than 75W power is a multi-layer planar transformer which allows 100% reproductibility for optimized module efficiencies. The controlled feedback regulation is located at the secondary side allowing a high regulation bandwidth and a very fast response to load changes.
Vin
LC input filter
POWER STAGE
LC output filter
Vo
4
UVLO Current Sense Mosfet Driver OVP
On/Off
Auxilliary supply
Control circuit
Feed-back function
Sense Trim
Sync Thermal Shutdown
Isolation Barrier
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MGDM-75 Series 4- Electrical Specifications
Data are valid at +25C, unless otherwise specified.
Parameter 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 Nominal Nominal Nominal Nominal Nominal Nominal Maximum Maximum Maximum Maximum Maximum Maximum Maximum Maximum Typical Typical Typical Typical Maximum Minimum Maximum Typical VDC VDC VDC VDC VDC VDC % W A A A A A A mVpp mVpp mVpp mVpp % % % % 3,3 5 12 15 24 28 +/- 2 50 to 75 15 12,5 6,25 5 3,125 2,7 50 100 150 250 +/- 1 90 ** 110 Conditions Limit or typical Nominal Min. - Max. Nominal Nominal Maximum Maximum Typical Maximum Maximum Units
Hi-Rel Grade
Single Output MGDS-75 75 - H 24 9 - 45 8,5 7,5 30 500 1 30 10 75 - O 28 16 - 80 15,5 14,5 30 500 0,2 30 10
Full temperature range 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
VDC VDC VDC VDC ms mApp A mA mA
Output voltage *
Ui min. to max.
3,3 5 12 15 24 28 +/- 2 50 to 75 15 15 6,25 5 3,125 2,7 50 100 150 250 +/- 1 90 ** 110
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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) Output Voltage Trim Efficiency
Ambient temperature : +25c Ui nominal, 75% load At 105c baseplate Ui min. to max.
Full temperature range Ui min. to max.
Ui nominal Full load BW = 20MHz Ui min. to max. 0% to full load As function of output voltage Ui nominal Full load
Please consult factory
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.
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MGDM-75 Series 4- Electrical Characteristics (continued)
Typical efficiency MGDS75HB at 25C
83% 80% 78% 75% 73% 70% 68% 65% 63% 60% 5 10 15 20 25 30 35 40 45
10W 20W 30W 40W 50W
Hi-Rel Grade
Typical efficiency MGDS75HC at 25C
83% 80% 78% 75% 73% 70% 68% 65% 63% 60% 5 10 15 20 25 30 35 40 45
15W 30W 45W 60W 75W
Input voltage Vin (Vdc)
Input voltage Vin (Vdc)
Typical efficiency MGDS75HE at 25C
88% 86% 84% 82% 80% 78% 76% 74% 72% 70% 68% 5 10 15 20 25 30 35 40 45
15W 30W 45W 60W 75W
Typical efficiency MGDS75HF at 25C
89% 88% 87% 86% 85% 84% 83% 82% 81% 80% 79% 78% 77% 76% 75% 74% 73% 5 10 15 20 25 30 35 40 45
15W 30W 45W 60W 75W
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Input voltage Vin (Vdc)
Input voltage Vin (Vdc)
Typical efficiency MGDS75HJ at 25C
88% 85% 83% 80% 78% 75% 73% 70% 68% 65% 63% 60% 58% 5 10 15 20 25 30 35 40 45
15W 30W 45W 60W 75W
Input voltage Vin (Vdc)
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MGDM-75 Series 4- Electrical Characteristics (continued)
Hi-Rel Grade
Typical efficiency MGDS75OC at 25C
86% 85% 84% 83% 82% 81% 80% 79% 78% 77% 76% 75% 74% 73% 72% 71% 10 20 30 40 50 60 70 80
15W 30W 45W 60W 75W
Input voltage Vin (Vdc)
Typical efficiency MGDS75OE at 25C
88% 86% 84% 82% 80% 78% 76% 74% 72% 70% 68% 10 20 30 40 50 60 70 80
15W 30W 45W 60W 75W
4
Input voltage Vin (Vdc)
Typical efficiency MGDS75OI at 25C
90% 88% 85% 83% 80% 78% 75% 73% 70% 68% 65% 63% 60% 10 20 30 40 50 60 70 80 70% 68% 10
15W 30W 45W 60W 75W
Typical efficiency MGDS75OJ at 25C
90% 88% 85% 83% 80% 78% 75% 73%
15W 30W 45W 60W 75W
20
30
40
50
60
70
80
Input voltage Vin (Vdc)
Input voltage Vin (Vdc)
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MGDM-75 Series 5- Switching Frequency
Parameter Switching frequency Conditions Full temperature range Ui min. to max. No load to full load Limit or typical Nominal, fixed Specifications 420 KHz
Hi-Rel Grade
6- 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 1.500 VDC / 1 min 1.500 VDC / 1 min 100 MOhm
7- Protection Functions
Characteristics Input undervoltage lock-out (UVLO) Output current limitation protection (OCP) Output overvoltage protection (OVP) Over temperature protection (OTP) Protection Device Turn-on, turn-off circuit with hysteresis cycle Straight line current limitation Overvoltage protection device with latch-up Thermal device with hysteresis cycle Recovery Automatic recovery Automatic recovery Automatic recovery Automatic recovery Limit or typical Turn-on nominal Turn-off nominal Nominal Nominal Nominal Specifications see section 4 110% of output current 120% of output voltage 115C
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8- Reliability Data
Characteristics Conditions Ground fixed (Gf) Mean Time Between Failure (MTBF) According to MIL-HDBK-217F Airborne, Inhabited, Cargo (AIC) Avionics Military Cargo Temperature Case at 40C Case at 85C Case at 40C Case at 85C / Specifications 700.000 Hrs 190.000 Hrs 390.000 Hrs 125.000 Hrs Consult factory
Mean Time Between Failure (MTBF) According to IEC-62380-TR
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MGDM-75 Series 9- Electromagnetic Interference
Hi-Rel Grade
Electromagnetic Interference requirements according to MIL-STD-461C/D/E standards can be easily achieved as indicated in the following section. The following table resumes the different sections covered by these standards.
Standard Requirements Conducted emission (CE) : Low frequency High frequency Conducted susceptibility (CS) : Low frequency High frequency Radiated emission (RE) : Magnetic field Electrical field Radiated susceptibility (RS) : Magnetic field Electrical field Compliance Description Applicability
MIL-STD-461C Standard CE 01 CE 03 CS 01 CS 02 RE 01 RE 02 RS 01 RS 03 See section 8-1 H, O input module
MIL-STD-461D/E Standard CE 101 CE 102 CS 101 CS114 RE 101 RE 102 RS 101 RS 103 See section 8-1 H, O input module
Compliance with GAIA Converter Module & common mode capacitance compliant module stand-alone compliant with additionnal filter compliant with additionnal filter compliant with additionnal filter compliant module stand-alone compliant module stand-alone compliant module stand-alone compliant module stand-alone see also EMI design notes
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, Gaia 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.
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Cc LMC1 LMC2 VI C6 C8 C5 C7 C9 R2
BP BP
Cc Vo
C2 C1 C3 C4
R1
MGDM-series
GI BP BP Cc
Go 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.
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MGDM-75 Series 10- Thermal Characteristics
Characteristics Operating ambient temperature range at full load Baseplate temperature Storage temperature range Thermal resistance Conditions Ambient temperature * Base plate temperature Non functionning Baseplate to ambient Rth(b-a) free air Limit or typical Minimum Maximum Minimum Maximum Minimum Maximum Typical Performances - 40C see section 10-9 - 40C + 105C - 55C + 125C 11C/W
Hi-Rel Grade
Note * : The upper temperature range depends on configuration, the user must assure a max. baseplate temperature of + 105C.
The MGDM-75 series maximum baseplate temperature at full load must not exceed 105C. 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. * 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.
To calculate a maximum admissible ambient temperature the following method can be used. Knowing the maximum baseplate temparature Tbase = 105C of the module, the power used Pout and the efficiency : * determine the power dissipated by the module Pdiss that should be evacuated : Pdiss = Pout(1/ - 1) (A) * determine the maximum ambient temperature : Ta = 105C - Rth(b-a) x Pdiss (B) 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 0.4C/W for no interface down to 0.1C/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.
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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 Heatsink Thermaflo 424500B0000 : Heatsink Thermaflo 424800B0000 : No Heatsink baseplate only : Forced air cooling 200 LFM Heatsink Radian HS1568EX : Heatsink Thermaflo 424800B0000 : No Heatsink baseplate only : Forced air cooling 400 LFM Heatsink Radian HS1568EX : Heatsink Thermaflo 424800B0000 : Forced air cooling 1000 LFM No Heatsink baseplate only : Heatsink Thermaflo 424800B0000 : 11C/W 7,64C/W 3,5C/W 6,9C/W 3,5C/W 2,8C/W 4,8C/W 2C/W 1,80C/W 2,8C/W 1C/W Thermal resistance baseplate to heatsink No need of thermal pad Berquist Silpad* : Berquist Silpad* : No need of thermal pad Berquist Silpad* : Berquist Silpad* : No need of thermal pad Berquist Silpad* : Berquist Silpad* : No need of thermal pad Berquist Silpad* : 0,21C/W 0,21C/W 0,21C/W 0,21C/W 0,21C/W 0,21C/W 0,21C/W Global resistance 11C/W 7,85C/W 3,71C/W 6,9C/W 3,71C/W 3,01C/W 4,8C/W 2,21C/W 2,01C/W 2,8C/W 1,21C/W
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Radian and Thermaflo are heasink manufacturers. Silpad (c) 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.
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MGDM-75 Series 10- Thermal Characteristics (continued)
The two formulas (A) and (B) described in previous page : * Pdiss = Pout(1/ - 1) (A) * no heatsink * Ta = 105C - 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.
Hi-Rel Grade
In particular, as example the following typical curves are calculated with :
* a Thermaflo heatsink reference 424800B0000 and a Berquist Silpad for various cooling conditions.
MGDS-75-H-x Series Thermal Curves
75 70 65 60 55 Output power (W) 50 45 40 35 30 25 20 15 10 5 0 0 10 20 30 40 50 60 70 80 Ambient temperature (C) 90 100 110
no heatsink no heatsink 200LFM no heatsink 400 LFM heatsink 1000 LFM heatsink heatsink 200 LFM heatsink 400 LFM heatsink 1000 LFM
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MGDS-75-O-x Series Thermal Curves
75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 0 10 20 30 40 50 60 70 80 Ambient temperature (C) 90 100 110
Output power (W)
no heatsink no heatsink 200LFM no heatsink 400 LFM heatsink heatsink heatsink heatsink heatsink 1000 LFM 200 LFM 400 LFM 1000 LFM
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MGDM-75 Series 11- Environmental Qualifications
The modules have been subjected to the following environmental qualifications.
Hi-Rel Grade
Characteristics Climatic Qualifications Life at high temperature
Conditions
Severity
Test procedure
Duration Temperature / status of unit Altitude level C Duration Climb up Stabilization Status of unit Number of cycle Cycle duration Relative humidity variation Temperature variation Status of unit Damp heat Temperature Duration Status of unit Temperature Concentration NaCl Duration Status of unit Number of cycles Temperature change Transfert time Steady state time Status of unit Number of shocks Temperature change Transfert time Steady state time Status of unit
Test D : 1.000 Hrs @ 105C case, unit operating @ 125C ambient, unit not operating 40.000 ft@-55C 30 min. 1.000 ft/min to 70.000 f@-55C, 30 min. unit operating 10 Cycle I : 24 Hrs 60 % to 88 % 31C to 41C unit not operating 93 % relative humidity 40C 56 days unit not operating 35C 5% 48 Hrs unit not operating 200 -40C / +85C 40 min. 20 min. unit operating 100 -55C / +105C 10 sec. 20 min. unit not operating
MIL-STD-202G Method 108A
Altitude
MIL-STD-810E Method 500.3
Humidity cyclic
MIL-STD-810E Method 507.3
Humidity steady
MIL-STD-202G Method 103B
Salt atmosphere
MIL-STD-810E Method 509.3
Temperature cycling
MIL-STD-202A Method 102A
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Temperature shock
MIL-STD-202G Method 107G
Mechanical Qualifications Number of cycles Frequency / amplitude Frequency / acceleration Duration Status of unit Number of shocks Peak acceleration Duration Shock form Status of unit Number of bumps Peak 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 3 shocks in each axis 100 g 6 ms 1/2 sinusoidal unit not operating 2000 Bumps in each axis 40 g 6 ms unit not operating
Vibration (Sinusoidal)
MIL-STD-810D Method 514.3
Shock (Half sinus)
MIL-STD-810D Method 516.3
Bump (Half sinus)
MIL-STD-810D Method 516.3
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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.
Hi-Rel Grade
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)
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.
Vout
Icurrent limit
4
12-3 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 turn the converter off at 120% (+/-5%) of output voltage. Once in OVP protection, the module will restart automatically when overvoltage is removed.
110% of full 130% of full rated current rated current
Iout
12-4 Over Temperature Protection (OTP)
A thermal protection device adjusted at 115C (+/-5%) internal temperature with 10C 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
10c
115c
Baseplate Temperature
12
(c) Gaia Converter FC03-032.03/06 Revision G
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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 : Ru = R1 (V0-Vref)V0nom - R1 - R2 (V0-V0nom)Vref
4 Vin 3 Vo 5
Hi-Rel Grade
MGDM75
On/Off
Error amp. R1 R2 1F
S+ 6 Ru Trim 7 S- 8 Go 9 Load
2
Sync
Vref= 2.5V
1 Gin
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 3 Vo 5
MGDM75
On/Off
Error amp. R1 R2 1F
S+ 6 Trim 7 Rd S- 8 Go 9
Load
2
Sync
Vref= 2.5V
4
1 Gin
Trim via a voltage The output voltage is given by the following formula : V0 = 1 + R1 (Vtrim - 1) (R1 + R2) Vref
4 Vin 3
Vo 5
MGDM75
On/Off
Error amp. R1 R2 1F
S+ 6 Ru Trim 7
BAT54 100nF
Load
2
Sync
Vref= 2.5V
S- 8 Go 9
Vcontrol
1 Gin
Parameter Trim reference Resistor R1 Resistor R2 Trim capacitor
Unit Vdc Ohm Ohm F
Min. 2,45 / / /
Typ. 2,5 3800 270 1
Max. 2,55 / / /
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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
Hi-Rel Grade
Vo 5
MGDM75
On/Off
S+ 6 Trim 7
Load
2
Sync
S- 8 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.
Parameter On/Off module enable voltage On/Off module disable voltage On/Off module enable delay On/Off module disable delay Unit Vdc Vdc ms s Min. 2 0 / / Typ. / / / / Max. 4,5 0.5 30 100
Vi 4 Vin 3 On/Off BP Vo 5 S+ 6 7 MGDM75 Trim On/Off Gi 2 Sync S- 8 Go 9
Load
1 Gin
4
Notes, conditions Open, the switch must not sink more than 100A The switch must be able to sink 1mA The module restarts with the same delay after alarm mode removed 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..
Vsync
4V +/- 0,5
Vi
4 Vin 3
100pF
BP Vo 5 S+ 6 7 MGDM75 Trim
On/Off
Ext. clock
Totem pole output 1N4148
Load
2
4.7k
Sync
S- 8 Go 9
Gi
1 Gin
0V 30ns max T/2 100ns max T ( 860Khz < F < 940Khz )
Vin
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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 4 Vin 3 On/Off BP Vo 5 S+ 6 10nF
Hi-Rel Grade
MGDM75 Trim 7
2 Sync S- 8 Go 9 BP 10nF
(*)
1 Gin 10nF
10nF 4 Vin 3 On/Off BP
10nF Vo 5 S+ 6
MGDM75 Trim 7
On/Off 2 Sync S- 8 Go 9 BP 10nF
(*) BP: Base Plate
1 Gin 10nF
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 4 Vin 3 100F 2 On/Off BP Vo 5 S+ 6 10nF
MGDM75 Trim 7
Sync S- 8 Go 9 BP 10nF
(*)
1 Gin 10nF
10nF 4 Vin 3 100F 2 On/Off BP
10nF Vo 5 S+ 6
MGDM75 Trim 7
Sync S- 8 Go 9 BP 10nF
(*) BP: Base Plate
1 Gin 10nF
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15 For locations, phone, fax, E-Mail see back cover
MGDM-75 Series 11- Dimensions
Hi-Rel Grade
Dimensions are given in mm (inches). Tolerance : +/- 0,2 mm (+/- 0.01 ") unless otherwise indicated. Weight : 70 grams (1.95 Ozs) max.
3,81 (0.15) 3,81 (0.15) 3,81 (0.15)
Mouting Hole 0 3,1 (0.122)
3,81 (0.15)
10,795 (0.425)
9,894 (0.39)
9,589 (0.38)
0.5 (0,019)
3,56 (0.14)
3,56 (0.14)
57,912 (2.28)
47,24 (1.86)
50,8 (2.00)
Uncoated metal header Use this side for heat sinking
CH 2x2
26,16 (1.03) 36,83 (1.45)
12.7 Max (0,5)
5.6 min (0,22) 6.8 max (0,267)
,4 R2 ) .1 (0
Pin dimensions : Pin 1, 2, 3, 4, 7, 8 : O 1 mm (0.04") Pin 5, 9 : O 1,5 mm (0.059")
4
12- Product marking
Side face : Company logo, module reference, Date code : year and week of manufacturing
13- Connections
9 8 7 6 5
Pin 1 2 3 4 5 6 7 8 9
Single Output - Input (Gi) Synchro (Sync) On/Off + Input (Vi) + Output (Vo) Sense + (S+) Trim (Trim) Sense - (S-) - Output (Go)
1
2
3
4
Bottom view
(c) Gaia Converter FC03-032.03/06 Revision G
16 For locations, phone, fax, E-Mail see back cover
For more detailed specifications and applications information, contact :
International Headquarters Marketing and Sales department GAIA 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 GAIA Converter Canada, Inc Address : 6611 Thissen ST-LAURENT, QUEBEC - CANADA H4S 1W2 Tel. : (514)-333-3169 Fax : (514)-333-4519
Printed in France by Gaia Converter FC03-032.03/06 Revision G Graphisme : Philippe Clicq
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.

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