FEATURES••••••••••••••–55°to +125°C operation16 to 40 VDC inputFully IsolatedMagnetic feedbackFixed frequency, 600 kHz typicalTopology – Single Ended Forward50 V for up to 50 ms transient protectionInhibit (input & output side)Sync function (in and out)Output trim on single output modelsIndefinite short circuit protectionRemote sense on single output modelsUp to 87% efficiency / 43 W/in3Parallelable up to 148 wattsDC/DC CONVERTERS28 VOLTINPUTMFL SERIES65 WATTMODELSVDC OUTPUTSINGLE5121528DUAL±5±12±15Size (max):3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm)Case UWeight:100 grams maximumScreening: Standard, ES, or 883 (Class H).DESCRIPTION
The MFLSeries™28-volt DC/DC converters are rated up to 65watts of output power over a –55°C to +125°C temperature rangewith a 28 Vdc nominal input. On dual output models up to 70% ofthe rated output power can be drawn from either the positive ornegative output. Current sharing allows the units to be paralleled fortotal power of up to 148watts. The welded, hermetically sealedpackage is only 3.005 x 1.505 x 0.400 inches, giving the series anoverall power density of up to 43 watts per cubic inch.
INHIBIT
The MFLSeries converters have two TTLcompatible inhibit termi-nals (INH1 and INH2) that can be used to disable power conversion,resulting in a very low quiescent input current and no generation ofswitching noise. An open collector TTLcompatible low (<0.8 volts)is required to inhibit the converter between INH1 (pin 4) and InputCommon (pin 2). An open collector TTLcompatible low (<0.5 volts)is required to inhibit the converter between INH2 (pin 12) and OutputCommon (pin 8). The application of intermediate voltages to thesepins (1.5 to 10.5 volts) should be avoided.
DESIGNFEATURES
The MFLSeries converters are switching regulators that use aquasi-square wave, single ended forward converter design with aconstant switching frequency of 600 kHz.
Isolation between input and output circuits is provided with a trans-former in the forward path and a wide bandwidth magnetic couplingin the feedback control loop. The MFLuses a unique dual loop feed-back technique that controls output current with an inner feedbackloop and an output voltage with a cascaded voltage mode feedbackloop.
The additional secondary current mode feedback loop improvestransient response in a manner similar to primary current modecontrol and allows for ease of paralleling, but without the cost andcomplexity.
The cascaded constant frequency, pulse-width modulatedconverters use a quasi-square wave single-ended forward design.Tight load regulation is achieved through a wide-bandwidthmagnetic feedback circuit. The output on single MFLmodels can betrimmed (see Figure 1 for voltage changes with different resistorvalues).
CURRENTANDPARALLELOPERATION
Multiple MFLconverters may be used in parallel to drive a commonload (see Figure 2). In this mode of operation the load current isshared by two or three MFLconverters. In current sharing mode,one MFLconverter is designated as a master. The SLAVE pin (pin11) of the master is left unconnected and the MSTR/INH2 pin (pin12) of the master is connected to the SLAVE pin (pin 11) of the slaveunits. The units designated as slaves have the MSTR/INH2 pin (pin12) connected to the SNS RTN pin (pin 9). Figure 2 shows thetypical setup for two or three units in parallel. Note that synchro-nizing the units together (though shown in the figure) is not requiredfor current sharing operation.Asecond slave unit may be placed inparallel with a master and slave; this requires the TRI pin (pin 3) ofthe master unit to be connected to the SNS RTN pin (pin 9).When paralleled, 76% of the total combined power ratings of theMFLconverters are available at the load. Overload and short circuitperformance are not adversely affected during parallel operation.
®1
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MFL SERIES 65 WATTABSOLUTE MAXIMUM RATINGS
Input Voltage•16 to 40 VDC
Power Dissipation (Pd)
•14 watts (16 watts MFL2805S, MFL2805D)Output Power
•50 to 65 watts depending on model
Lead Soldering Temperature (10 sec per lead)•300°C
Storage Temperature Range (Case)•–65°C to +150°C
DC/DC CONVERTERSSYNC AND INHIBIT (INH1, INH2)
Sync In (525 to 675 kHz)
•Duty cycle 40% min, 60% max •Logic low 0.8 V max
•Logic high 4.5 V min, 9 V max•Referenced to input common
•If not used, connect to input commonSync Out
•Referenced to input common
Inhibit (INH1, INH2) TTLOpen Collector •Logic low (output disabled)
INH1 referenced to input common
Logic low 0.8 V max
Inhibit pin current 10 mAmax
INH2 referenced to output common
Logic low 0.5 V max
Inhibit pin current 5 mAmax
•Logic high (output enabled)
Open collector
TYPICALCHARACTERISTICS
Output Voltage Temperature Coefficient•100 ppm/°C typical
Input to Output Capacitance•150 pF, typicalIsolation
•100 megohm minimum at 500 VAudio Rejection •50 dB typical
Conversion Frequency
•Free run mode 600 kHz typical550 kHz. min, 650 kHz max
•External sync range 525 to 675 kHzInhibit Pin Voltage (unit enabled)•INH1 = 9 to12 V, INH2 = 6 to 9 V
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
•16 to 40 VDC continuous •50 V for 120 msec transientCase Operating Temperature (Tc)•–55°C to +125°C full power•–55°C to +135°C absoluteDerate Output Power/Current
•Linearly from 100% at 125°C to 0% at 135°C
PINS NOT USED
TR1, Master, and Slave
If not used, leave unconnected
Electrical Characteristics: –55°C to +125°C1Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
SINGLE OUTPUT MODELSPARAMETEROUTPUTVOLTAGEOUTPUTCURRENTOUTPUTPOWEROUTPUTRIPPLEVOLTAGE10 k - 2 MHzLINE REGULATIONLOAD REGULATIONINPUTVOLTAGENO LOAD TO FULLINPUTCURRENT
CONDITIONTc = 25°CVIN= 16 TO 40 VDCVIN= 16 TO 40 VDC
Tc = 25°CTc = –55°C to +125°CVIN= 16 to 40 VDCNO LOAD TO FULLCONTINUOUSTRANSIENT250 msNO LOADFULLLOADINHIBITED - INH1INHIBITED - INH2
INPUTRIPPLECURRENTEFFICIENCYLOAD FAULT310 kHz - 10 MHzTc = 25°C
POWER DISSIPATIONSHORTCIRCUIT
Tc = 25°C
RECOVERY
STEPLOAD RESP.
50% – 100% – 50%
TRANSIENTRECOVERY416 – 40 – 16 VDCTRANSIENT5RECOVERY4DELAYOVERSHOOT
MFL2805SMIN TYPMAX4.955.005.0500————16——————77
——15300028—70—9351580
10503550202040501202.5147050—
MFL2812SMINTYPMAX11.8812.0012.1200————16——————83
——30450028—50—9351586
5607510020204050802.8147050—
MFL2815SMINTYPMAX14.8515.0015.1500————16——————84
——30450028—50—9351587
4.33658511020204050803.0147050—
MFL2828S1MINTYPMAX127.7228.0028.2800————16——————83
——100—202028—60—9352086
2.3265200—607540501002.8147050—
UNITSVDCAWmV p-pmVmVVDCVmAAmA
mApp%
————————
12.51.52501.52502003.50
1643503.0300300625
————————
101.54501.52502003.50
1446003.0400300650
————————
101.55001.52502003.50
1446003.0400300650
————————
71.0
144
AmsmV pkmsmV pkµsmsmV pk
80014001.53.02502003.50
8004006100
STEPLINE RESP.
START-UP
Notes
1.MFL2828S specifiications are at 25°Tc, contact your Interpoint repre-sentative for more information.
2.Unit will shut down above approximately 45V but will be undamaged andwill restart when voltage drops into normal range.
3.Indefinite short circuit protection not guaranteed above 125°C case.
4.Recovery time is measured from application of the transient to point atwhich Vout is within 1% of final value.5. Transition time ≥10 µs.
®2
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DC/DC CONVERTERSDUALOUTPUT MODELSPARAMETEROUTPUTVOLTAGEOUTPUTCURRENT1VIN= 16 TO 40 VDCOUTPUTPOWEROUTPUTRIPPLEVOLTAGE +/– VOUTLINE REGULATIONVIN= 16 TO 40 VDCLOAD REGULATIONNO LOAD TO FULLCROSS REGULATIONTc = 25°C
INPUTVOLTAGENO LOAD TO FULLINPUTCURRENTTc = 25°C
10 kHz- 2 MHz
+VOUT–VOUT+VOUT–VOUT
SEE NOTE 2SEE NOTE 3CONTINUOUSTRANSIENT450 ms.
NO LOADFULLLOADINHIBITED - INH1INHIBITED - INH210 kHz- 10 MHzBALANCED LOADPOWER DISSIPATIONSHORTCIRCUITRECOVERY
50 %–100%– 50% LOAD
TRANSIENT
RECOVERY616 – 40 – 16 VINTRANSIENT7RECOVERY6DELAYOVERSHOOT
———————160—————77————————
500250255328—50—935158012.51.52501.52502003.50
64050120147050—164.03503.030030062510050100501008
———————160—————83————————
228—50—9351586101.54501.52502003.505002510502
440501002.80147050—144.06003.0400300650120501001001204
—160—————84——————————————
228—50—9351587101.55001.52502003.505002510502
440501003.00147050—144.06003.0400300650150501001001504
CONDITIONS
+VOUT
Tc = 25°C
–VOUTEACH OUTPUTTOTALOUTPUTVIN= 16 TO 40 VDC
MFL2805DMIN TYPMAX4.955.005.054.925.005.08000
———
71050
MFL2812DMFL2815DMINTYPMAXMINTYPMAX11.8812.0012.12 14.8515.0015.15 11.8212.0012.1814.7715.0015.23000
———
3.5560
000
———
3.034.3465
MFL SERIES 65 WATTUNITSVDCAWmV p-pmVmV%VDCVmAAmAmAp-p%WmsmV pkmsmV pkµsmsmV p
Electrical Characteristics: –55°C to +125°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
INPUTRIPPLECURRENT
EFFICIENCY25°C TcLOAD FAULT5Tc = 25°C
STEPLOAD
RESPONSE ±VOUTSTEPLINE RESPONSE ±VOUTSTART–UP
Notes
1.Up to 70% of the total output power is available from either output providingthe opposite output is simultaneously carrying 30% of the total power.
2. Effect on the negative output under the following conditions:+Pout30% to 70%; –Pout70% to 30%
3. Effect on the negative output under the following conditions:+Pout 50%; –Pout10% to 50%
4.Unit will shut down above approximately 45V but will be undamaged and willrestart when voltage drops into normal range.
5.Indefinite short circuit protection not guaranteed above 125°C case.
6.Recovery time is measured from application of the transient to point at whichVout is within 1% of final value.7. Transition time ≥10 µs.
®3
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MFL SERIES 65 WATT28V+–DC/DC CONVERTERSSINGLE OUTPUT MODELS CONNECTION DIAGRAMS - SENSE AND PARALLEL
12345Sync In6MSTR/INH212Slave11Pos. Sense109Sense Return8Output Common7Positive OutputPositive InputInput CommonTR1INH1Sync OutSync InInhibit–+RLREMOTE SENSE CONNECTION12345Sync In6MSTR/INH21211Slave10Pos. Sense9Sense Return8Output Common7Positive Output28V+–Positive InputInput CommonTR1INH1Sync OutSync InRA–+RLInhibitOUTPUT VOLTAGE ADJUST CONNECTIONVOUT INCREASE(VOLT)0.10.20.30.40.5RA (OHMS)12–V15–V252050751001254060801005–V70140210280350FIGURE1: SENSECONNECTIONSANDTRIMTABLE28V+–123456Positive InputInput CommonTR1INH1Sync OutSync InMSTR/INH212Slave11Pos. SenseSense ReturnPositive Output10987–+RLInhibitSync InMASTEROutput CommonCONNECT ONLY WHEN 2 SLAVES ARE USED123456Positive InputInput CommonTR1INH1Sync OutSync InMSTR/INH212Slave11Pos. Sense10Sense Return9Output Common87Positive OutputSLAVE 1123456Positive InputInput CommonTR1INH1Sync OutSync InMSTR/INH212Slave11Pos. Sense10Sense Return9SLAVE 2Output Common87Positive OutputFIGURE2: PARALLELCONNECTIONS®4
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DC/DC CONVERTERSPIN OUTPin123456789101112Single OutputPositive InputInput CommonTriple (TRI)Inhibit 1 (INH1)Sync OutSync InPositive OutputOutput CommonSense ReturnPositive SenseSlaveMaster/ Inhibit 2MFL2828SPositive InputInput CommonTriple (TRI)Inhibit 1 (INH1)Sync OutSync InPositive OutputNo connectionOutput CommonNo connectionSlaveMaster/ Inhibit 2Dual OutputPositive InputInput CommonTriple (TRI)Inhibit 1 (INH1)Sync OutSync InPositive OutputOutput CommonNegative OutputNo connectionSlaveMaster / Inhibit 2Angled corner indicates pin one.MFL SERIES 65 WATT1234561211TOP VIEWMFL(Pin side, marked side)10987See Section B8, case U1, for dimensions.Pin 6 should be connected to input common ifexternal sync (Sync In) is not used.Sense pins must be connected to their respectiveoutputs if not used.FIGURE3: PINOUTSMD NUMBERS
MODELNUMBERING KEYBase ModelInput VoltageOutput VoltageNumber of Outputs(S = single, D = dual)Screening(Standard screening has no designatorin this position.)MFL 28 05 S / ES STANDARDMICROCIRCUIT
DRAWING(SMD)5962-9316301HXC5962-9316201HXC5962-9316101HXCIN PROCESS
5962-9319101HXC5962-9319201HXC5962-9319301HXC
MFLSERIESSIMILARPARTMFL2805S/883MFL2812S/883MFL2815S/883MFL2828S/883MFL2805D/883MFL2812D/883MFL2815D/883
For exact specifications for an SMD product, refer to theSMD drawing. See Section A3, SMDs, for more information.
Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified.
908516V908516V908516VEfficiency (%)Efficiency (%)Efficiency (%)807528V40V8075706528V8075706540V28V40V7065601020304050Output (Watts)6010MFL2805S & MFL2805D EfficiencyOutput Power (Watts)20304050606010203040506065Output Power (Watts)MFL2812S & MFL2812D EfficiencyMFL2815S & MFL2815D EfficiencyFIGURE4FIGURE5FIGURE6®5
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MFL SERIES65 WATT9016 VIN85807570656001020304050607040 VIN28 VINDC/DC CONVERTERS0.20.Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified.
Attenuation (dB)Efficiency (%)100mV/div.20V/div.Vout40.60.80.Vin100.0.1Output Power (Watts)Frequency (kHz)110100MFL2828S EfficiencyMFL Series Audio Rejection50 µs/div16 to 40 VMFL2805S Step Line ResponseFIGURE7FIGURE8FIGURE920V/div.100% to 50%Vin20V/div.100mV/div.1ms/divNo LoadVin+Vout100mV/div.1V/div.50% to 100%Vout–Vout1ms/divMFL2805S Step Load ResponseMFL2805S Turn On Response50 µs/div16 to 40 VMFL2815D Step Line ResponseFIGURE10FIGURE118VIN+VoutFIGURE12–Vout Voltage Change (%)20V/div.50% to 100%–Pout = 32.5W6420– 2– 4– 6– 83040506070MFL2805DMFL2812DMFL2815D200mV/div.100% to 50%5V/div.–Vout1ms/divMFL2815D Step Load Response1ms/divNo LoadMFL2815D Turn On ResponseOutput Load (%)+Pout 80 to 20 %, –Pout 20 to 80%Cross RegulationFIGURE13
16151413MFL2805S & 5D121110MFL2812S & 12D203040506065MFL2815S & 15DFIGURE14FIGURE15Input Voltage (Volts)Output Power (Watts)Low Line DropoutFIGURE16®6
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DC/DC CONVERTERSAngled corner indicates pin oneMFLSERIES 65 WATT1.505 max (38.23)CASE UTOP VIEW(PIN SIDE)See Figure 18 for dimensions3.005 (76.33) max.MaterialsHeader Cold Rolled Steel/Nickel/GoldCover Kovar/NickelPins #52 alloy/Gold compression glass sealFIGURE17: CASEU MAXIMUMDIMENSIONSAngled cornerindicates pin one.1.505 (38.23) max.1.380 (35.05)1.250 (31.75)1.050 (26.67)0.850 (21.59)0.650 (16.51)0.450 (11.43)0.250 (6.35)0.120 (3.05)0.000Seam Seal0.23 (5.8) Lead Length0.128 dia(3.25).0.040 dia(1.02)1234561211TOP VIEW CASE U109872.880 (73.15)3.005 (76.33) max.0.0000.120 (3.05)0.250 (6.35)2.750 (69.85)0.410 (10.41) max.FIGURE18: CASEUCAUTION
Heat from reflow or wave soldering may damage thedevice. Solder pins individually with heat application notexceeding 300°C for 10 seconds per pin.
Case dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places, ±0.01(0.2) for two decimal places unless otherwise specifiedAlthough every effort has been made to render the casedrawings at actual size, variations in the printing processmay cause some distortion. Please refer to the numericaldimensions for accuracy.
®0.050 (1.27)0.0000.220 (5.597
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MFLSERIES 65 WATTTEST
PRE-CAPINSPECTIONMethod 2017,2032
DC/DC CONVERTERSENVIRONMENTALSCREENINGSTANDARD
/ES
/883 (Class H)*
yes
yes
yes
TEMPERATURE CYCLE (10 times)
Method 1010, Cond. C, -65°C to 150°CMethod 1010, Cond. B, -55°C to 125°CCONSTANTACCELERATIONMethod 2001, 3000 gMethod 2001, 500 g
BURN-IN
Method 1015, 160 hours at 125°C96 hours at 125°C case (typical)
FINALELECTRICALTESTMIL-PRF-38534, Group ASubgroups 1 through 6: -55°C, +25°C, +125°CSubgroups 1 and 4: +25°C case HERMETICITYTESTING
Fine Leak, Method 1014, Cond. AGross Leak, Method 1014, Cond. CGross Leak, Dip (1 x 10-3)FINALVISUALINSPECTIONMethod 2009
nononoyesyesno
nononoyesyesno
nononoyesyesno
noyesnoyesyesno
nonoyesyesyesnoyesyesno
yesyesyes
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
*883 products are built with element evaluated components and are 100% tested and guaranteed overthe full military temperature range of –55°C to +125°C.
Contact Information:Interpoint Headquarters USAPhone:1-800-822-8782
+425-882-3100
Email:power@intp.com
www.interpoint.comInterpoint UK
Phone: +44-1252-872266Email:poweruk@intp.com
Interpoint France
Phone:+33-134285455Email:powerfr@intp.com
8
20022-001-DTS Rev B
All technical information is believed to be accurate, but no responsibility isassumed for errors or omissions. Interpoint reserves the right to make changes inproducts or specifications without notice. MFLSeries is a trademark of Interpoint.Copyright ©1994 - 2003 Interpoint. All rights reserved.
®
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