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 For locations, phone, fax, E-Mail see back cover 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 3 For locations, phone, fax, E-Mail see back cover 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 5 For locations, phone, fax, E-Mail see back cover 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 8 For locations, phone, fax, E-Mail see back cover 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 For locations, phone, fax, E-Mail see back cover 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 :