FEATURES • • • • • • • • • • • • • • –55° to +125°C 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 Series™ 28-volt DC/DC converters are rated up to 65 watts of output power over a –55°C to +125°C 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. 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). 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. 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. ® 1 DC/DC CONVERTERS MFL SERIES 65 WATT ABSOLUTE MAXIMUM RATINGS SYNC AND INHIBIT (INH1, INH2) TYPICAL CHARACTERISTICS 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 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 RECOMMENDED OPERATING CONDITIONS Input Voltage Range • 16 to 40 VDC continuous • 50 V for 120 msec transient Case Operating Temperature (Tc) • –55°C to +125°C full power • –55°C to +135°C absolute Derate Output Power/Current • Linearly from 100% at 125°C to 0% at 135°C 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 PINS NOT USED TR1, Master, and Slave If not used, leave unconnected Electrical Characteristics: –55°C to +125° C1 Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. SINGLE OUTPUT MODELS PARAMETER OUTPUT VOLTAGE MFL2812S MFL2815S MFL2828S1 MIN TYP MAX 11.88 12.00 12.12 MIN TYP MAX 14.85 15.00 15.15 MIN TYP MAX1 27.72 28.00 28.28 MFL2805S CONDITION Tc = 25°C MIN 4.95 OUTPUT CURRENT VIN = 16 TO 40 VDC 0 — 10 0 — 5 0 — 4.33 0 — 2.32 A OUTPUT POWER VIN = 16 TO 40 VDC 0 — 50 0 — 60 0 — 65 0 — 65 W OUTPUT RIPPLE TYP MAX 5.00 5.05 Tc = 25°C — 15 35 — 30 75 — 30 85 — 100 200 Tc = –55°C to +125°C — 30 50 — 45 100 — 45 110 — — — LINE REGULATION VIN = 16 to 40 VDC — 0 20 — 0 20 — 0 20 — 20 60 LOAD REGULATION NO LOAD TO FULL — 0 20 — 0 20 — 0 20 — 20 75 mV INPUT VOLTAGE NO LOAD TO FULL CONTINUOUS TRANSIENT2 50 ms 16 — 28 — 40 50 16 — 28 — 40 50 16 — 28 — 40 50 16 — 28 — 40 50 VDC V NO LOAD FULL LOAD INHIBITED - INH1 — — — 70 — 9 120 2.5 14 — — — 50 — 9 80 2.8 14 — — — 50 — 9 80 3.0 14 — — — 60 — 9 100 2.8 14 mA A INHIBITED - INH2 — 35 70 — 35 70 — 35 70 — 35 70 VOLTAGE 10 k - 2 MHz INPUT CURRENT INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT3 STEP LOAD RESP. STEP LINE RESP. START-UP mV p-p mV mA 10 kHz - 10 MHz — 15 50 — 15 50 — 15 50 — 20 50 mA pp Tc = 25°C POWER DISSIPATION SHORT CIRCUIT Tc = 25°C 77 80 — 83 86 — 84 87 — 83 86 — % — 12.5 16 — 10 14 — 10 14 — 7 14 A RECOVERY — 1.5 4 — 1.5 4 — 1.5 4 — 1.0 4 ms 50% – 100% – 50% TRANSIENT RECOVERY4 — — 250 1.5 350 3.0 — — 450 1.5 600 3.0 — — 500 1.5 600 3.0 — — 800 1400 1.5 3.0 mV pk ms 16 – 40 – 16 VDC TRANSIENT5 RECOVERY4 — — 250 200 300 300 — — 250 200 400 300 — — 250 200 400 300 — — 250 200 800 400 mV pk µs DELAY OVERSHOOT — — 3.5 0 6 25 — — 3.5 0 6 50 — — 3.5 0 6 50 — — 3.5 0 6 100 ms mV pk Notes 1. MFL2828S specifiications are at 25°Tc, 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 125°C 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 µs. ® 2 UNITS VDC MFL SERIES 65 WATT DC/DC CONVERTERS Electrical Characteristics: –55°C to +125°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. DUAL OUTPUT MODELS PARAMETER OUTPUT VOLTAGE CONDITIONS +VOUT Tc = 25°C –VOUT MFL2805D MIN TYP MAX 4.95 5.00 5.05 4.92 5.00 5.08 MFL2812D MIN TYP MAX 11.88 12.00 12.12 11.82 12.00 12.18 MFL2815D MIN TYP MAX 14.85 15.00 15.15 14.77 15.00 15.23 UNITS VDC OUTPUT CURRENT1 EACH OUTPUT 0 — 7 0 — 3.5 0 — 3.03 VIN = 16 TO 40 VDC TOTAL OUTPUT 0 — 10 0 — 5 0 — 4.34 VIN = 16 TO 40 VDC 0 — 50 0 — 60 0 — 65 W 10 kHz - 2 MHz mV p-p OUTPUT POWER A OUTPUT RIPPLE VOLTAGE +/– VOUT — 50 100 — 50 120 — 50 150 LINE REGULATION +VOUT — 0 50 — 0 50 — 0 50 VIN = 16 TO 40 VDC –VOUT — 25 100 — 25 100 — 25 100 LOAD REGULATION NO LOAD TO FULL +VOUT –VOUT — — 0 25 50 100 — — 10 50 100 120 — — 10 50 100 150 — — 5 8 — — 2 4 — 2 4 CROSS REGULATION Tc = 25°C INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT Tc = 25°C SEE NOTE 2 SEE NOTE 3 3 6 CONTINUOUS TRANSIENT4 50 ms. NO LOAD FULL LOAD INHIBITED - INH1 INHIBITED - INH2 16 0 — — — — 28 — 50 — 9 35 40 50 120 — 77 STEP LOAD RESPONSE ± VOUT 10 kHz - 10 MHz BALANCED LOAD POWER DISSIPATION SHORT CIRCUIT RECOVERY 50 %–100%– 50% LOAD TRANSIENT STEP LINE RESPONSE ± VOUT RECOVERY6 16 – 40 – 16 VIN TRANSIENT7 RECOVERY6 DELAY OVERSHOOT INPUT RIPPLE CURRENT EFFICIENCY 25°C Tc LOAD FAULT5 Tc = 25°C START–UP 2 4 — 2 4 mV mV % 28 — 50 — 9 35 40 50 100 2.80 14 70 16 0 — — — — 28 — 50 — 9 35 40 50 100 3.00 14 70 VDC V mA A 14 70 16 0 — — — — 15 80 50 — — 83 15 86 50 — — 84 15 87 50 — mA p-p % — — 12.5 1.5 16 4.0 — — 10 1.5 14 4.0 — — 10 1.5 14 4.0 W ms — 250 350 — 450 600 — 500 600 mV pk — 1.5 3.0 — 1.5 3.0 — 1.5 3.0 ms — 250 300 — 250 400 — 250 400 mV pk — — 200 3.5 300 6 — — 200 3.5 300 6 — — 200 3.5 300 6 µs ms — 0 25 — 0 50 — 0 50 mV p 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% mA 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 125°C 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 µs. ® 3 DC/DC CONVERTERS MFL SERIES 65 WATT SINGLE OUTPUT MODELS CONNECTION DIAGRAMS - SENSE AND PARALLEL 28V + – Inhibit 1 Positive Input 2 Input Common 3 TR1 4 INH1 5 6 Sync In MSTR/INH2 12 Slave 11 Pos. Sense 10 9 Sense Return Sync Out Output Common Sync In Positive Output – 8 7 + RL REMOTE SENSE CONNECTION 28V + – 1 Positive Input 2 Input Common 3 4 Inhibit 5 6 Sync In MSTR/INH2 12 11 Slave 10 Pos. Sense 9 Sense Return 8 Output Common 7 Positive Output TR1 INH1 Sync Out Sync In RA – + RL OUTPUT VOLTAGE ADJUST CONNECTION RA (OHMS) 12–V 15–V 25 20 VOUT INCREASE (VOLT) 0.1 5–V 70 0.2 140 50 40 0.3 210 75 60 0.4 280 100 80 0.5 350 125 100 FIGURE 1: SENSE CONNECTIONS AND TRIM TABLE 28V Inhibit + – 1 Positive Input 2 Input Common 3 TR1 4 5 Sync In 6 INH1 MSTR/INH2 12 Slave 11 Pos. Sense MASTER Sync Out Sense Return Output Common Sync In Positive Output 10 9 – 8 7 + RL CONNECT ONLY WHEN 2 SLAVES ARE USED 1 Positive Input 2 Input Common 3 TR1 4 INH1 5 Sync Out 6 Sync In 1 Positive Input 2 Input Common 3 TR1 4 INH1 5 Sync Out 6 Sync In SLAVE 1 MSTR/INH2 12 Slave 11 Pos. Sense 10 Sense Return 9 Output Common 8 Positive Output 7 MSTR/INH2 12 Slave 11 Pos. Sense 10 Sense Return 9 Output Common 8 SLAVE 2 Positive Output 7 FIGURE 2: PARALLEL CONNECTIONS ® 4 MFL SERIES 65 WATT 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. 12 1 11 2 TOP VIEW MFL (Pin side, marked side) 3 4 10 9 5 8 6 7 See Section B8, case U1, for dimensions. FIGURE 3: PIN OUT 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. SMD NUMBERS MODEL NUMBERING KEY MFL MFL SERIES SIMILAR PART STANDARD MICROCIRCUIT DRAWING (SMD) 5962-9316301HXC 5962-9316201HXC 5962-9316101HXC IN PROCESS 5962-9319101HXC 5962-9319201HXC 5962-9319301HXC 28 05 S / ES Base Model Input Voltage Output Voltage Number of Outputs (S = single, D = dual) Screening (Standard screening has no designator in this position.) 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: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified. 90 90 16V 28V 75 40V 70 75 65 60 10 20 30 40 50 40V 70 60 10 Output (Watts) 28V 80 65 16V 85 Efficiency (%) 80 90 16V 85 Efficiency (%) Efficiency (%) 85 28V 80 75 40V 70 65 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 ® 5 DC/DC CONVERTERS MFL SERIES 65 WATT Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified. 90 0. 16 VIN 70 65 0 10 20 30 40 50 60 70 40. Vout 60. 80. 100. 0.1 1 10 Vin 50 µs/div 16 to 40 V 100 Output Power (Watts) Frequency (kHz) MFL2828S Efficiency MFL Series Audio Rejection MFL2805S Step Line Response FIGURE 9 FIGURE 8 20V/div. FIGURE 7 100mV/div. 100% to 50% 20V/div. 60 100mV/div. 40 VIN 75 20. 20V/div. 28 VIN 80 Attenuation (dB) Efficiency (%) 85 Vin Vin 50% to 100% Vout –Vout 1ms/div No Load 1ms/div MFL2805S Step Load Response 100mV/div. 1V/div. +Vout MFL2805S Turn On Response FIGURE 10 50 µs/div 16 to 40 V MFL2815D Step Line Response FIGURE 12 FIGURE 11 100% to 50% 1ms/div MFL2815D Step Load Response VIN +Vout –Vout 1ms/div No Load MFL2815D Turn On Response –Vout Voltage Change (%) 5V/div. 200mV/div. –Pout = 32.5W 20V/div. 8 50% to 100% 6 MFL2805D 4 2 MFL2812D 0 MFL2815D –2 –4 –6 –8 30 40 50 60 Cross Regulation FIGURE 14 FIGURE 13 FIGURE 15 Input Voltage (Volts) 16 15 MFL2815S & 15D 14 13 MFL2805S & 5D 12 MFL2812S & 12D 11 10 20 30 40 50 60 65 Output Power (Watts) Low Line Dropout FIGURE 16 ® 6 70 Output Load (%) +Pout 80 to 20 %, –Pout 20 to 80% MFL SERIES 65 WATT DC/DC CONVERTERS Angled corner indicates pin one CASE U TOP VIEW (PIN SIDE) See Figure 18 for dimensions 1.505 max (38.23) 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 Seam Seal Angled corner indicates pin one. 0.23 (5.8) Lead Length 0.128 dia (3.25). 1.505 (38.23) max. 0.040 dia (1.02) 1.380 (35.05) 1.250 (31.75) 1 12 1.050 (26.67) 2 11 0.850 (21.59) 3 0.650 (16.51) 4 9 0.450 (11.43) 5 8 0.250 (6.35) 6 7 10 TOP VIEW CASE U CAUTION Heat from reflow or wave soldering may damage the device. Solder pins individually with heat application not exceeding 300°C for 10 seconds per pin. 0.220 (5.59 0.050 (1.27) 0.000 0.410 (10.41) max. FIGURE 18: CASE U 2.880 (73.15) 3.005 (76.33) max. 2.750 (69.85) 0.120 (3.05) 0.250 (6.35) 0.000 0.120 (3.05) 0.000 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. ® 7 DC/DC CONVERTERS MFL SERIES 65 WATT ENVIRONMENTAL SCREENING TEST STANDARD /ES /883 (Class H)* PRE-CAP INSPECTION Method 2017, 2032 yes yes yes TEMPERATURE CYCLE (10 times) Method 1010, Cond. C, -65°C to 150°C Method 1010, Cond. B, -55°C to 125°C no no no yes yes no CONSTANT ACCELERATION Method 2001, 3000 g Method 2001, 500 g no no no yes yes no BURN-IN Method 1015, 160 hours at 125°C 96 hours at 125°C case (typical) no no no yes yes no FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 through 6: -55°C, +25°C, +125°C Subgroups 1 and 4: +25°C case no yes no yes yes no HERMETICITY TESTING Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) no no yes yes yes no yes yes no FINAL VISUAL INSPECTION Method 2009 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 –55°C to +125°C. Contact Information: www.interpoint.com Interpoint Headquarters USA Phone: 1-800-822-8782 +425-882-3100 Email: [email protected] Interpoint UK Phone: +44-1252-872266 Email: [email protected] 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 © 1994 - 2003 Interpoint. All rights reserved. Interpoint France Phone: +33-134285455 Email: [email protected] ®