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| FEATURES * * * * * * * * * * * * * * -55 to +125C operation 16 to 40 VDC input Fully Isolated Magnetic feedback Fixed frequency, 600 kHz typical Topology - Single Ended Forward 50 V for up to 50 ms transient protection Inhibit (input & output side) Sync function (in and out) Output trim on single output models Indefinite short circuit protection Remote sense on single output models Up to 87% efficiency / 43 W/in3 Parallelable up to 148 watts DC/DC CONVERTERS 28 VOLT INPUT MFL SERIES 65 WATT MODELS VDC OUTPUT SINGLE 5 12 15 28 DUAL 5 12 15 Size (max): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm) Case U Weight: 100 grams maximum Screening: Standard, ES, or 883 (Class H). DESCRIPTION The MFL SeriesTM 28-volt DC/DC converters are rated up to 65 watts of output power over a -55C to +125C temperature range with a 28 Vdc nominal input. On dual output models up to 70% of the rated output power can be drawn from either the positive or negative output. Current sharing allows the units to be paralleled for total power of up to 148watts. The welded, hermetically sealed package is only 3.005 x 1.505 x 0.400 inches, giving the series an overall power density of up to 43 watts per cubic inch. INHIBIT The MFL Series converters have two TTL compatible inhibit terminals (INH1 and INH2) that can be used to disable power conversion, resulting in a very low quiescent input current and no generation of switching noise. An open collector TTL compatible low (<0.8 volts) is required to inhibit the converter between INH1 (pin 4) and Input Common (pin 2). An open collector TTL compatible low (<0.5 volts) is required to inhibit the converter between INH2 (pin 12) and Output Common (pin 8). The application of intermediate voltages to these pins (1.5 to 10.5 volts) should be avoided. DESIGN FEATURES The MFL Series converters are switching regulators that use a quasi-square wave, single ended forward converter design with a constant switching frequency of 600 kHz. Isolation between input and output circuits is provided with a transformer in the forward path and a wide bandwidth magnetic coupling in the feedback control loop. The MFL uses a unique dual loop feedback technique that controls output current with an inner feedback loop and an output voltage with a cascaded voltage mode feedback loop. The additional secondary current mode feedback loop improves transient response in a manner similar to primary current mode control and allows for ease of paralleling, but without the cost and complexity. The cascaded constant frequency, pulse-width modulated converters use a quasi-square wave single-ended forward design. Tight load regulation is achieved through a wide-bandwidth magnetic feedback circuit. The output on single MFL models can be trimmed (see Figure 1 for voltage changes with different resistor values). CURRENT AND PARALLEL OPERATION Multiple MFL converters may be used in parallel to drive a common load (see Figure 2). In this mode of operation the load current is shared by two or three MFL converters. In current sharing mode, one MFL converter is designated as a master. The SLAVE pin (pin 11) of the master is left unconnected and the MSTR/INH2 pin (pin 12) of the master is connected to the SLAVE pin (pin 11) of the slave units. The units designated as slaves have the MSTR/INH2 pin (pin 12) connected to the SNS RTN pin (pin 9). Figure 2 shows the typical setup for two or three units in parallel. Note that synchronizing the units together (though shown in the figure) is not required for current sharing operation. A second slave unit may be placed in parallel with a master and slave; this requires the TRI pin (pin 3) of the master unit to be connected to the SNS RTN pin (pin 9). When paralleled, 76% of the total combined power ratings of the MFL converters are available at the load. Overload and short circuit performance are not adversely affected during parallel operation. (R) 1 MFL SERIES 65 WATT ABSOLUTE 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) * 300C Storage Temperature Range (Case) * -65C to +150C DC/DC CONVERTERS SYNC 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 common Sync Out * Referenced to input common Inhibit (INH1, INH2) TTL Open Collector * Logic low (output disabled) INH1 referenced to input common Logic low 0.8 V max Inhibit pin current 10 mA max INH2 referenced to output common Logic low 0.5 V max Inhibit pin current 5 mA max * Logic high (output enabled) Open collector TYPICAL CHARACTERISTICS Output Voltage Temperature Coefficient * 100 ppm/C typical Input to Output Capacitance * 150 pF, typical Isolation * 100 megohm minimum at 500 V Audio Rejection * 50 dB typical Conversion Frequency * Free run mode 600 kHz typical 550 kHz. min, 650 kHz max * External sync range 525 to 675 kHz Inhibit 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 transient Case Operating Temperature (Tc) * -55C to +125C full power * -55C to +135C absolute Derate Output Power/Current * Linearly from 100% at 125C to 0% at 135C PINS NOT USED TR1, Master, and Slave If not used, leave unconnected Electrical Characteristics: -55C to +125 C1 Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. SINGLE OUTPUT MODELS PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT OUTPUT POWER OUTPUT RIPPLE VOLTAGE 10 k - 2 MHz LINE REGULATION LOAD REGULATION INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT CONDITION Tc = 25C VIN = 16 TO 40 VDC VIN = 16 TO 40 VDC Tc = 25C Tc = -55C to +125C VIN = 16 to 40 VDC NO LOAD TO FULL CONTINUOUS TRANSIENT2 50 ms NO LOAD FULL LOAD INHIBITED - INH1 INHIBITED - INH2 INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT3 10 kHz - 10 MHz Tc = 25C POWER DISSIPATION SHORT CIRCUIT Tc = 25C RECOVERY STEP LOAD RESP. 50% - 100% - 50% TRANSIENT RECOVERY4 16 - 40 - 16 VDC TRANSIENT5 RECOVERY4 DELAY OVERSHOOT MFL2805S MIN 4.95 0 0 -- -- -- -- 16 -- -- -- -- -- -- 77 TYP MAX 5.00 5.05 -- -- 15 30 0 0 28 -- 70 -- 9 35 15 80 10 50 35 50 20 20 40 50 120 2.5 14 70 50 -- MFL2812S MIN TYP MAX 11.88 12.00 12.12 0 0 -- -- -- -- 16 -- -- -- -- -- -- 83 -- -- 30 45 0 0 28 -- 50 -- 9 35 15 86 5 60 75 100 20 20 40 50 80 2.8 14 70 50 -- MFL2815S MIN TYP MAX 14.85 15.00 15.15 0 0 -- -- -- -- 16 -- -- -- -- -- -- 84 -- -- 30 45 0 0 28 -- 50 -- 9 35 15 87 4.33 65 85 110 20 20 40 50 80 3.0 14 70 50 -- MFL2828S1 MIN TYP MAX1 27.72 28.00 28.28 0 0 -- -- -- -- 16 -- -- -- -- -- -- 83 -- -- 100 -- 20 20 28 -- 60 -- 9 35 20 86 2.32 65 200 -- 60 75 40 50 100 2.8 14 70 50 -- mA pp % UNITS VDC A W mV p-p mV mV VDC V mA A mA -- -- -- -- -- -- -- -- 12.5 1.5 250 1.5 250 200 3.5 0 16 4 350 3.0 300 300 6 25 -- -- -- -- -- -- -- -- 10 1.5 450 1.5 250 200 3.5 0 14 4 600 3.0 400 300 6 50 -- -- -- -- -- -- -- -- 10 1.5 500 1.5 250 200 3.5 0 14 4 600 3.0 400 300 6 50 -- -- -- -- -- -- -- -- 7 1.0 14 4 A ms mV pk ms mV pk s ms mV pk 800 1400 1.5 3.0 250 200 3.5 0 800 400 6 100 STEP LINE RESP. START-UP Notes 1. MFL2828S specifiications are at 25Tc, contact your Interpoint representative for more information. 2. Unit will shut down above approximately 45V but will be undamaged and will restart when voltage drops into normal range. 3. Indefinite short circuit protection not guaranteed above 125C case. 4. Recovery time is measured from application of the transient to point at which Vout is within 1% of final value. 5. Transition time 10 s. (R) 2 DC/DC CONVERTERS DUAL OUTPUT MODELS PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT1 VIN = 16 TO 40 VDC OUTPUT POWER OUTPUT RIPPLE VOLTAGE +/- VOUT LINE REGULATION VIN = 16 TO 40 VDC LOAD REGULATION NO LOAD TO FULL CROSS REGULATION Tc = 25C INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT Tc = 25C 10 kHz - 2 MHz +VOUT -VOUT +VOUT -VOUT SEE NOTE 2 SEE NOTE 3 CONTINUOUS TRANSIENT4 50 ms. NO LOAD FULL LOAD INHIBITED - INH1 INHIBITED - INH2 10 kHz - 10 MHz BALANCED LOAD POWER DISSIPATION SHORT CIRCUIT RECOVERY 50 %-100%- 50% LOAD TRANSIENT RECOVERY6 16 - 40 - 16 VIN TRANSIENT7 RECOVERY6 DELAY OVERSHOOT -- -- -- -- -- -- -- 16 0 -- -- -- -- -- 77 -- -- -- -- -- -- -- -- 50 0 25 0 25 5 3 28 -- 50 -- 9 35 15 80 12.5 1.5 250 1.5 250 200 3.5 0 6 40 50 120 14 70 50 -- 16 4.0 350 3.0 300 300 6 25 100 50 100 50 100 8 -- -- -- -- -- -- -- 16 0 -- -- -- -- -- 83 -- -- -- -- -- -- -- -- 2 28 -- 50 -- 9 35 15 86 10 1.5 450 1.5 250 200 3.5 0 50 0 25 10 50 2 4 40 50 100 2.80 14 70 50 -- 14 4.0 600 3.0 400 300 6 50 120 50 100 100 120 4 -- 16 0 -- -- -- -- -- 84 -- -- -- -- -- -- -- -- -- -- -- -- -- -- 2 28 -- 50 -- 9 35 15 87 10 1.5 500 1.5 250 200 3.5 0 50 0 25 10 50 2 4 40 50 100 3.00 14 70 50 -- 14 4.0 600 3.0 400 300 6 50 150 50 100 100 150 4 CONDITIONS +VOUT Tc = 25C -VOUT EACH OUTPUT TOTAL OUTPUT VIN = 16 TO 40 VDC MFL2805D MIN TYP MAX 4.95 5.00 5.05 4.92 5.00 5.08 0 0 0 -- -- -- 7 10 50 MFL2812D MIN TYP MAX 11.88 12.00 12.12 11.82 12.00 12.18 0 0 0 -- -- -- 3.5 5 60 MFL2815D MIN TYP MAX 14.85 15.00 15.15 14.77 15.00 15.23 0 0 0 -- -- -- 3.03 4.34 65 MFL SERIES 65 WATT UNITS VDC A W Electrical Characteristics: -55C to +125C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. mV p-p mV mV % VDC V mA A mA mA p-p % W ms mV pk ms mV pk s ms mV p INPUT RIPPLE CURRENT EFFICIENCY 25C Tc LOAD FAULT5 Tc = 25C STEP LOAD RESPONSE VOUT STEP LINE RESPONSE VOUT START-UP Notes 1. Up to 70% of the total output power is available from either output providing the opposite output is simultaneously carrying 30% of the total power. 2. Effect on the negative output under the following conditions: +Pout 30% to 70%; -Pout 70% to 30% 3. Effect on the negative output under the following conditions: +Pout 50%; -Pout 10% to 50% 4. Unit will shut down above approximately 45V but will be undamaged and will restart when voltage drops into normal range. 5. Indefinite short circuit protection not guaranteed above 125C case. 6. Recovery time is measured from application of the transient to point at which Vout is within 1% of final value. 7. Transition time 10 s. (R) 3 MFL SERIES 65 WATT 28V + - DC/DC CONVERTERS SINGLE OUTPUT MODELS CONNECTION DIAGRAMS - SENSE AND PARALLEL 1 2 3 Inhibit Sync In 4 5 6 MSTR/INH2 12 Slave 11 Pos. Sense 10 9 8 7 + RL Positive Input Input Common TR1 INH1 Sync Out Sync In Sense Return Output Common Positive Output - REMOTE SENSE CONNECTION 1 2 3 Inhibit Sync In 4 5 6 MSTR/INH2 12 11 Slave 10 Pos. Sense 9 Sense Return 8 Output Common 7 Positive Output 28V + - Positive Input Input Common TR1 INH1 Sync Out Sync In RA - + RL OUTPUT VOLTAGE ADJUST CONNECTION VOUT INCREASE (VOLT) 0.1 0.2 0.3 0.4 0.5 RA (OHMS) 12-V 15-V 25 20 50 75 100 125 40 60 80 100 5-V 70 140 210 280 350 FIGURE 1: SENSE CONNECTIONS AND TRIM TABLE 28V + - 1 2 3 4 5 6 Positive Input Input Common TR1 INH1 Sync Out Sync In MSTR/INH2 12 Slave 11 Pos. Sense Sense Return 10 9 8 7 + RL - Inhibit Sync In MASTER Output Common Positive Output CONNECT ONLY WHEN 2 SLAVES ARE USED 1 2 3 4 5 6 Positive Input Input Common TR1 INH1 Sync Out Sync In MSTR/INH2 12 Slave 11 Pos. Sense 10 Sense Return 9 Output Common 8 Positive Output 7 SLAVE 1 1 2 3 4 5 6 Positive Input Input Common TR1 INH1 Sync Out Sync In MSTR/INH2 12 Slave 11 Pos. Sense 10 Sense Return 9 Output Common 8 Positive Output 7 SLAVE 2 FIGURE 2: PARALLEL CONNECTIONS (R) 4 DC/DC CONVERTERS PIN OUT Pin 1 2 3 4 5 6 7 8 9 10 11 12 Single Output Positive Input Input Common Triple (TRI) Inhibit 1 (INH1) Sync Out Sync In Positive Output Output Common Sense Return Positive Sense Slave Master/ Inhibit 2 MFL2828S Positive Input Input Common Triple (TRI) Inhibit 1 (INH1) Sync Out Sync In Positive Output No connection Output Common No connection Slave Master/ Inhibit 2 Dual Output Positive Input Input Common Triple (TRI) Inhibit 1 (INH1) Sync Out Sync In Positive Output Output Common Negative Output No connection Slave Master / Inhibit 2 Angled corner indicates pin one. MFL SERIES 65 WATT 1 2 3 4 5 6 12 11 TOP VIEW MFL (Pin side, marked side) 10 9 8 7 See Section B8, case U1, for dimensions. Pin 6 should be connected to input common if external sync (Sync In) is not used. Sense pins must be connected to their respective outputs if not used. FIGURE 3: PIN OUT SMD NUMBERS MODEL NUMBERING KEY MFL Base Model Input Voltage Output Voltage Number of Outputs (S = single, D = dual) Screening (Standard screening has no designator in this position.) 28 05 S / ES STANDARD MICROCIRCUIT DRAWING (SMD) 5962-9316301HXC 5962-9316201HXC 5962-9316101HXC IN PROCESS 5962-9319101HXC 5962-9319201HXC 5962-9319301HXC MFL SERIES SIMILAR PART MFL2805S/883 MFL2812S/883 MFL2815S/883 MFL2828S/883 MFL2805D/883 MFL2812D/883 MFL2815D/883 For exact specifications for an SMD product, refer to the SMD drawing. See Section A3, SMDs, for more information. Typical Performance Curves: 25C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified. 90 85 16V 90 85 16V 90 85 16V Efficiency (%) Efficiency (%) Efficiency (%) 80 75 28V 80 75 70 65 28V 80 75 70 65 40V 28V 40V 70 65 60 10 20 30 40 50 40V Output (Watts) 60 10 20 30 40 50 60 60 10 20 30 40 50 60 65 Output Power (Watts) Output Power (Watts) MFL2805S & MFL2805D Efficiency MFL2812S & MFL2812D Efficiency MFL2815S & MFL2815D Efficiency FIGURE 4 FIGURE 5 FIGURE 6 (R) 5 MFL SERIES 65 WATT 90 16 VIN 85 80 75 70 65 60 0 10 20 30 40 50 60 70 40 VIN 28 VIN DC/DC CONVERTERS 0. 20. Typical Performance Curves: 25C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified. Attenuation (dB) Efficiency (%) 100mV/div. 20V/div. Vout 40. 60. 80. Vin 100. 0.1 1 10 100 Output Power (Watts) Frequency (kHz) MFL2828S Efficiency MFL Series Audio Rejection 50 s/div 16 to 40 V MFL2805S Step Line Response FIGURE 7 FIGURE 8 FIGURE 9 100% to 50% 20V/div. Vin 20V/div. 100mV/div. 1ms/div No Load Vin +Vout 100mV/div. 1V/div. 50% to 100% Vout -Vout 1ms/div MFL2805S Step Load Response MFL2805S Turn On Response 50 s/div 16 to 40 V MFL2815D Step Line Response FIGURE 10 FIGURE 11 8 FIGURE 12 20V/div. 50% to 100% -Pout = 32.5W -Vout Voltage Change (%) 6 4 2 0 -2 -4 -6 -8 30 40 50 60 70 MFL2805D MFL2812D MFL2815D VIN +Vout 200mV/div. 100% to 50% 5V/div. -Vout 1ms/div MFL2815D Step Load Response 1ms/div No Load MFL2815D Turn On Response Output Load (%) +Pout 80 to 20 %, -Pout 20 to 80% Cross Regulation FIGURE 13 16 MFL2815S & 15D FIGURE 14 FIGURE 15 Input Voltage (Volts) 15 14 13 MFL2805S & 5D 12 MFL2812S & 12D 11 10 20 30 40 50 60 65 Output Power (Watts) Low Line Dropout FIGURE 16 (R) 6 DC/DC CONVERTERS Angled corner indicates pin one MFL SERIES 65 WATT 1.505 max (38.23) CASE U TOP VIEW (PIN SIDE) See Figure 18 for dimensions 3.005 (76.33) max. Materials Header Cold Rolled Steel/Nickel/Gold Cover Kovar/Nickel Pins #52 alloy/Gold compression glass seal FIGURE 17: CASE U MAXIMUM DIMENSIONS Angled corner indicates 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) 0.000 Seam Seal 0.23 (5.8) Lead Length 0.128 dia (3.25). 0.040 dia (1.02) 1 2 3 12 11 10 TOP VIEW CASE U 4 5 6 9 8 7 2.750 (69.85) 2.880 (73.15) 3.005 (76.33) max. 0.000 0.120 (3.05) 0.250 (6.35) 0.410 (10.41) max. FIGURE 18: CASE U CAUTION Heat from reflow or wave soldering may damage the device. Solder pins individually with heat application not exceeding 300C 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 specified Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer to the numerical dimensions for accuracy. (R) 0.050 (1.27) 0.000 0.220 (5.59 7 MFL SERIES 65 WATT TEST PRE-CAP INSPECTION Method 2017, 2032 DC/DC CONVERTERS ENVIRONMENTAL SCREENING STANDARD /ES /883 (Class H)* yes yes yes TEMPERATURE CYCLE (10 times) Method 1010, Cond. C, -65C to 150C Method 1010, Cond. B, -55C to 125C CONSTANT ACCELERATION Method 2001, 3000 g Method 2001, 500 g BURN-IN Method 1015, 160 hours at 125C 96 hours at 125C case (typical) FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 through 6: -55C, +25C, +125C Subgroups 1 and 4: +25C case HERMETICITY TESTING Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) FINAL VISUAL INSPECTION Method 2009 no no no yes yes no no no no yes yes no no no no yes yes no no yes no yes yes no no no yes yes yes no yes yes no yes yes yes 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 over the full military temperature range of -55C to +125C. Contact Information: Interpoint Headquarters USA Phone: 1-800-822-8782 +425-882-3100 Email: power@intp.com www.interpoint.com Interpoint UK Phone: +44-1252-872266 Email: poweruk@intp.com Interpoint France Phone: +33-134285455 Email: powerfr@intp.com 8 20022-001-DTS Rev B All technical information is believed to be accurate, but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make changes in products or specifications without notice. MFL Series is a trademark of Interpoint. Copyright (c) 1994 - 2003 Interpoint. All rights reserved. (R) |
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