Hi-Rel DC/DC CONVERTER MGDM-75 : 75W POWER Hi-Rel Grade 5:1 Low Input Voltage 9-45 & 16-80 VDC 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/+105C baseplate * High efficiency (typ. 86%-90%) * Soft start * Galvanic isolation 1 500 VDC * Integrated LC EMI filter * Synchronizable * Fully protected by independant security * Under voltage lock-out * Overvoltage protection * Current limitation protection * Overtemperature protection * No optocoupler for high reliability * Leaded process 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 - input output / option suffix Input Voltage Range Permanent H : 9-45 VDC O : 16-80 VDC Options : /T : option for -55C start up operating temperature /S : option for screening and serialization Output B C E F I J : : : : : : Suffix : -L : leaded process REDEFINING THE SOURCE OF POWER (c) Gaia Converter FC03-032.12/13 Revision L 3.3 VDC 5 VDC 12 VDC 15 VDC 24 VDC 28 VDC For locations, phone, fax, E-Mail see back cover 4 Hi-Rel Grade MGDM-75 Series 2- Product Selection (continued) Input range Output Current Reference Options Suffix 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 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 /T /T /T /T /T /T , , , , , , /S /S /S /S /S /S -L -L -L -L -L -L 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 -L -L -L -L -L -L 4 Converter Selection Chart MGDS - 75 - O - C / T - L 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 operation /S : screening & serialization (consult application note screening grades) Suffix : -L : Leaded process (c) Gaia Converter FC03-032.12/13 Revision L 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 (c) Gaia Converter FC03-032.12/13 Revision L 3 For locations, phone, fax, E-Mail see back cover MGDM-75 Series Hi-Rel Grade 4- Electrical Specifications Data are valid at +25C, 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 10,2 8,3 15,2 13,8 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 15 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 % See curves page 5 & 6 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 : +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 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. (c) Gaia Converter FC03-032.12/13 Revision L 4 For locations, phone, fax, E-Mail see back cover Hi-Rel Grade MGDM-75 Series 4- Electrical Characteristics (continued) Typical efficiency MGDS75HC at 25C Typical efficiency MGDS75HB at 25C 83% 83% 80% 80% 78% 78% 75% 75% 10W 20W 73% 30W 40W 50W 70% 68% 70% 68% 65% 65% 63% 63% 60% 15W 30W 45W 60W 73% 75W 60% 5 10 15 20 25 30 35 40 45 5 10 15 Input voltage Vin (Vdc) Typical efficiency MGDS75HE at 25C 86% 84% 82% 80% 15W 30W 45W 60W 78% 76% 75W 74% 72% 70% 68% 10 15 20 25 30 35 25 30 35 40 45 Typical efficiency MGDS75HF at 25C 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 45W 60W 4 75W 5 10 15 20 25 30 35 40 45 Input voltage Vin (Vdc) Input voltage Vin (Vdc) Typical efficiency MGDS75HJ at 25C Typical efficiency MGDS75HI at 25C 90% 88% 88% 85% 85% 83% 83% 80% 78% 80% 15W 30W 45W 60W 75W 78% 75% 73% 70% 15W 30W 75% 73% 45W 60W 75W 70% 68% 68% 65% 65% 63% 63% 60% 58% 60% 5 10 15 20 25 30 35 40 45 5 10 Input voltage Vin (Vdc) (c) Gaia Converter FC03-032.12/13 Revision L 15 20 25 30 35 40 45 Input voltage Vin (Vdc) 5 For locations, phone, fax, E-Mail see back cover Hi-Rel Grade MGDM-75 Series 4- Electrical Characteristics (continued) Typical efficiency MGDS75OC at 25C Typical efficiency MGDS75OB at 25C 84% 83% 82% 81% 80% 79% 78% 10W 20W 30W 40W 50W 77% 76% 75% 74% 73% 72% 71% 70% 10 20 30 40 50 60 70 86% 85% 84% 83% 82% 81% 80% 79% 78% 77% 76% 75% 74% 73% 72% 71% 15W 30W 45W 60W 75W 10 80 20 30 40 50 60 70 80 Input voltage Vin (Vdc) Input voltage Vin (Vdc) Typical efficiency MGDS75OE at 25C Typical efficiency MGDS75OF at 25C 88% 90% 86% 88% 84% 86% 82% 84% 80% 15W 30W 78% 45W 60W 75W 76% 74% 80% 15W 30W 45W 78% 60W 75W 82% 76% 72% 74% 70% 72% 68% 4 70% 10 20 30 40 50 60 70 80 10 20 Input voltage Vin (Vdc) 30 40 50 60 70 80 Input voltage Vin (Vdc) Typical efficiency MGDS75OI at 25C Typical efficiency MGDS75OJ at 25C 90% 90% 88% 88% 85% 85% 83% 80% 83% 15W 30W 78% 75% 45W 60W 75W 73% 70% 68% 15W 30W 80% 45W 60W 75W 78% 75% 73% 65% 70% 63% 60% 68% 10 20 30 40 50 60 70 80 10 20 Input voltage Vin (Vdc) (c) Gaia Converter FC03-032.12/13 Revision L 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 1 500 VDC / 1 min 1 500 VDC / 1 min 1 500 VDC / 1 min 100 MOhm 6- Isolation Parameter Conditions Electric strength test voltage Input to output Input to case Output to case Limit or typical Minimum Minimum Minimum Isolation resistance 500 VDC Minimum Specifications 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 120% 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 115C 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 (c) Gaia Converter FC03-032.12/13 Revision L Conditions Temperature Specifications Ground fixed (Gf) Case at 40C Case at 85C 700 000 Hrs 190 000 Hrs Airborne, Inhabited, Cargo (AIC) Case at 40C Case at 85C 390 000 Hrs 125 000 Hrs Civilian avionics, calculators Ambient at 55C 100% time on 570 000 Hrs 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 with GAIA Converter Module & common mode capacitance 4 9-1 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, Gaia Converter can propose a stand-alone ready-to-use EMI filter module. This EMI filter module has to be used together with 4 external decoupling capacitance C c (10nF/rated voltage depending on isolation requirement) connected between input and case and output and case. EMI filter module reference : FGDS-10A-50V or FGDS-20A-50V. Please consult EMI filter datasheet for further details. Cc VI Vo VI EMI input Filter GI Cc BP BP Vo MGDM-series Go GI Go BP BP Cc Cc BP: Base Plate (c) Gaia Converter FC03-032.12/13 Revision L 8 For locations, phone, fax, E-Mail see back cover MGDM-75 Series Hi-Rel Grade 10- Thermal Characteristics Characteristics Conditions Limit or typical Performances Operating ambient temperature range at full load Ambient temperature * Minimum Maximum - 40C see below Baseplate temperature Base plate temperature Minimum Maximum - 40C + 105C Storage temperature range Non functionning Minimum Maximum - 55C + 125C Thermal resistance Baseplate to ambient Rth(b-a) free air Typical 11C/W Note * : The upper temperature range depends on configuration, the user must ensure a max. baseplate temperature of + 105C. The following discussion will help designer to determine the thermal characteristics and the operating temperature. 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 thru the 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 : - 1) (A) Pdiss = Pout(1/ * 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. 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 Forced air cooling 1000 LFM 11C/W Thermal resistance baseplate to heatsink No need of thermal pad 11C/W Heatsink Thermaflo 4245OOBOOOO : 7,64C/W Bergquist Silpad* : 0,21C/W 7,85C/W Heatsink Thermaflo 4248OOBOOOO : 3,5C/W Bergquist Silpad* : 0,21C/W 3,71C/W No Heatsink baseplate only : 6,9C/W No need of thermal pad Heatsink Radian HS1568EX : 3,5C/W Bergquist Silpad* : 0,21C/W 3,71C/W Heatsink Thermaflo 4248OOBOOOO : 2,8C/W Bergquist Silpad* : 0,21C/W 3,01C/W No Heatsink baseplate only : 4,8C/W No need of thermal pad Heatsink Radian HS1568EX : 2C/W Bergquist Silpad* : 0,21C/W 2,21C/W Heatsink Thermaflo 4248OOBOOOO : 1,8C/W Bergquist Silpad* : 0,21C/W 2,01C/W No Heatsink baseplate only : 2,8C/W No need of thermal pad Heatsink Thermaflo 4248OOBOOOO : 1C/W Bergquist Silpad* : Radian and Thermaflo are heasink manufacturers. Silpad (c) is a registered trademark of Bergquist. Note* : Silpad performance are for Silpad 400 with pressure conditions of 50 Psi. Surface of MGDS-75 series is 3,3 inch2. (c) Gaia Converter FC03-032.12/13 Revision L Global resistance For locations, phone, fax, E-Mail see back cover 6,9C/W 4,8C/W 2,8C/W 0,21C/W 1,21C/W 9 MGDM-75 Series Hi-Rel Grade 9- Thermal Characteristics (continued) : Heatsink Mounting To mount properly the module to heatsink, some important recommendations need to be taken into account in order to avoid overstressing conditions that might lead to premature failures. The module case is built with a copper IMS (isolated metalic substrate ) crimped on an aluminum frame that provides case rigidity. The IMS surface is the module base plate that need to be reported to heat sink to achieve proper cooling. If for some reasons like poor module report, the IMS base plate is subject to mechanical overstress, module's electrical characteristics may be definitely affected. A typical example of damageable report is the use of thick thermal interface with usual screwing torque applied on mounting screws. This combination causes a high pressure on baseplate center due to thermal interface material compression. The final consequence is a slight IMS bending that can conduct for the module to fail high voltage isolation leading to heavy electrical damage on internal circuit. Base plate overstress Heatsink Too ThickThermal Pad PCB screw Poor report not recommended Example of banned thermal interface : Bergquist Gap Pad VO Ultra Soft The good practice is to respect the 4 following recommendations: - do not exceed recommended screwing torque of 0,7 N.m (6 lbs.in) Heatsink - prefer thin thermal pad with thickness lower than 0,34 mm (0.015"). GAIA Converter recommends to use thin thermal pads instead of thermal compound like grease. Thermal Pad - take care to reflow module leads only when all assembly operations are completed. PCB - do not report module on surfaces with poor screw flatness characteristics. GAIA Converter recommends not to overflow 0,1mm/m for the surface flatness. Example of recommended thermal interface : Bergquist Silpad 400 4 Gaia converter suggests to follow the procedure hereunder for the mechanical assembly procedure in order to avoid any stress on the pins of the converters. It is good practice to be sure to mount the converters first mechanically, then solder the units in place. 1. Choice of the thermal gap pad : its shape must be the same as the module. The dimensions of the gap pad can be a little larger than the module. 1 4 3 2 2. Screw the converter to the heatsink and/or to the board. The four screws have to be screwed in a "X" sequence. * Lightly finger-tighten all screws and run several X sequences before achieving final torque to get homogeneous tightening. * Torque screws from 0,35 N.m (3 lbs.in) to 0,7 N.m (6 lbs.in). 3. Screw the heatsink to the board. 4. Solder the pins of the converters on the board. This sequence avoids mechanical stresses on the converters that could lead to stress internal components or assemblies and cause their failures. (c) Gaia Converter FC03-032.12/13 Revision L 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 @ 105C case, unit operating @ 125C ambient, unit not operating MIL-STD-202G Method 108A Altitude Altitude level C Duration Climb up Stabilization Status of unit 40 000 ft@-55C 30 min. 1.000 ft/min to 70 000 ft@-55C, 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 % 31C to 41C unit not operating MIL-STD-810E Method 507.3 Humidity steady Damp heat Temperature Duration Status of unit 93 % relative humidity 40C 56 days unit not operating MIL-STD-202G Method 103B Salt atmosphere Temperature Concentration NaCl Duration Status of unit 35C 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 -40C / +85C 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 -55C / +105C 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 2 000 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 2 000 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 (c) Gaia Converter FC03-032.12/13 Revision L 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 1,5V Vin UVLO Turn-on Vout 12-2 Output Over Current Protection (OCP) Icurrent limit Vout 4 The MGDM-75 Series incorporates a current limit and protection circuit. When the output current reaches 110%-140% of it's full-rated current (Icurrent limit), the output voltage falls and output current falls along the line as described in the figure herein. The module restart automatically to normal operation when overcurrent is removed. 2% Vnom Iout 110% of full Rated current 12-3 Output Overvoltage Protection (OVP) 140% of full Rated current 170% of full Rated current 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 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 (c) Gaia Converter FC03-032.12/13 Revision L 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 1F 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 1F S- 8 Go 9 1 Gin The output voltage is given by the following formula : V0 = 1 + R1 (Vtrim - 1) (R1 + R2) Vref 3 Vo 5 MGDM75 S+ 6 On/Off Ru Error amp. 2 Sync Trim 7 R1 R2 Vref= 2.5V 1F 1 Gin 100nF Vcontrol S- 8 Go 9 Unit Min. Typ. Max. Trim reference Vdc 2,45 2,5 2,55 Resistor R1 Ohm / 3 600 for H input 3 900 for O input / Resistor R2 Ohm / 270 / F / 1 / (c) Gaia Converter FC03-032.12/13 Revision L 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 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 Sync Load 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. 4 Vin Vi 3 BP Vo 5 S+ 6 On/Off MGDM75 On/Off 2 Load S- 8 Sync Go 9 1 Gin Gi Trim 7 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 100A 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 s / / 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 420KHz to 480KHz, 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 Vsync 100pF Gi 4V +/- 0,5 0V 30ns max S+ 6 MGDM75 2 1N4148 Vo 5 On/Off Ext. clock Totem pole output BP Sync 4.7k 1 Gin Trim 7 Load S- 8 Go 9 Vin T/2 100ns max (c) Gaia Converter FC03-032.12/13 Revision L T ( 420Khz < F < 480Khz ) 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). It is a rectangular signal with 4 Vp (+/0.5V) amplitude with an input impedance of 4,7 KOhm. 10nF 10nF BP 4 Vin Vo 5 3 S+ 6 On/Off MGDM75 2 S- 8 Sync 1 Gin Go 9 BP 10nF Trim 7 10nF (*) 10nF 10nF BP 4 Vin Vo 5 3 S+ 6 On/Off MGDM75 On/Off 2 S- 8 Sync 1 Gin Go 9 BP 10nF Trim 7 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 BP 4 Vin Vo 5 3 S+ 6 On/Off 100F MGDM75 2 S- 8 Sync 1 Gin Go 9 BP 10nF Trim 7 10nF (*) 10nF 10nF BP 4 Vin Vo 5 3 S+ 6 On/Off 100F MGDM75 2 S- 8 Sync 1 Gin 10nF Trim 7 Go 9 BP 10nF (*) BP: Base Plate (c) Gaia Converter FC03-032.12/13 Revision L 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) 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. R2 12.7 Max (0,5) ,4 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) Use this side for heat sinking (0 ) .1 5.6 min (0,22) 6.8 max (0,267) Pin dimensions : Pins : 1, 2, 3, 4, 7, 8 : O 1 mm (0.04") Pins : 5, 9 : O 1,5 mm (0.059") 4 12- Materials Frame : Aluminium alodined coating. Baseplate : Copper with tin finishing. Pins : Plated with pure matte tin over nickel underplate. 13- Product Marking Side face : Company logo, location of manufacturing. : Module reference : MGDx-75-X-Y. Date code : year and week of manufacturing, suffix, /option. 14- 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 (c) Gaia Converter FC03-032.12/13 Revision L 16 For locations, phone, fax, E-Mail see back cover International Headquarters GAIA Converter - France ZI de la Morandiere 33185 LE HAILLAN - FRANCE Tel. : + (33)-5-57-92-12-80 Fax : + (33)-5-57-92-12-89 North American Headquarters GAIA Converter Canada, Inc 4038 Le Corbusier Blvd LAVAL, QUEBEC - CANADA H7L 5R2 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 FC03-032.12/13 Revision L Graphisme : Philippe Clicq For more detailed specifications and applications information, contact :