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| FEATURES * * * * * * * * * * * * * * Fully qualified to Class H or K -55 to +125C operation 19 to 40 VDC input Fully Isolated Magnetic feedback Fixed frequency, 600 kHz typical Topology - Single Ended Forward Inhibit function - input and output Sync function Output trim on single output models Indefinite short circuit protection Remote sense on single output models Up to 87% efficiency Parallelable up to 270 watts DC/DC CONVERTERS 28 VOLT INPUT SMFLHP SERIES 100 WATT MODELS VDC OUTPUT SINGLE 3.3 5 12 15 DUAL 5 12 15 Size (max.): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm) See cases "U maximum dimensions" and "U" for dimensions. Weight: 86 grams maximum Screening: Space Prototype, Class H, or Class K Radiation hardness levels O or R See "QA Screening: Class H and K, QML" for more information. Available configurations: OO, HO, HR, KR DESCRIPTION The SMFLHP SeriesTM 28 volt DC/DC converters are rated up to 100 watts output power over a -55 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 outputs. Current sharing allows the units to be paralleled for total power of up to 270 watts. 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 67 watts per cubic inch. INHIBIT The SMFLHP 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. An open collector TTL compatible low (<0.8 volts) is required between INH1 (pin 4) and Input Common (pin 2) to inhibit the converter. An open collector TTL compatible low (<0.5 volts) is required between INH2 (pin 12) and Output Common (pin 8) to inhibit the converter. The application of intermediate voltages to these pins (1.5 to 10.5 volts) should be avoided. SCREENING SMFLHP converters offer screening options to Space Prototype (O), Class H, or Class K. Available radiation hardness (RHA) levels are O or R. See "QA Screening: Class H and K, QML" for more information. CURRENT SHARING AND PARALLEL OPERATION Multiple SMFLHP 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 SMFLHP converters. In current sharing mode, one SMFLHP 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, 90% of the total combined power ratings of the SMFLHP converters are available at the load. Overload and short circuit performance are not adversely affected during parallel operation. DESIGN FEATURES The SMFLHP 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 wide bandwidth magnetic coupling in the feedback control loop. The SMFLHP Series uses a unique dual loop feedback technique that controls output current with an inner feedback loop and 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. Tight load regulation is achieved through a wide-bandwidth magnetic feedback circuit. The output voltage on single SMFLHP models can be easily trimmed by adding an external resistor. (See Figure 1 for voltage changes with different resistor values.) Contact Information Interpoint, a Crane Co. Company PO Box 97005 * Redmond WA 98073-9705 425-895-4053 * electronics@craneae.com www.craneae.com/power SMFLHP SERIES 100 WATT ABSOLUTE MAXIMUM RATINGS Input Voltage * 0 to 40 VDC Power Dissipation (Pd) * 20 watts Output Power * 80 to 100 watts depending on model Lead Soldering Temperature (10 sec per lead) * 300C Storage Temperature Range (Case) * -65C to +150C DC/DC CONVERTERS SYNC IN 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 * 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) Current -10 to -5 mA INH1 referenced to input common Logic low 0.8 V max INH2 referenced to output common Logic low 0.5 V 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 * 19 to 40 VDC continuous * 50 V for 50 msec transient Case Operating Temperature (Tc) * -55 to +125C full power * -55 to +135C absolute Derating Output Power/Current * Linearly from 100% at 125C to 0% at 135C PINS NOT IN USE TR1 Inhibit (INH1) Sync Out Sync In Sense Lines Slave MSTR (INH 2) No connection No connection No connection Connect to output common Must be connected to appropriate outputs No connection No connection Electrical Characteristics: 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 -55C to +125C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. SMFLHP283R3S MIN 3.26 0 0 -- -- -- -- 19 -- -- -- -- -- -- 70 -- -- -- -- -- -- -- -- TYP MAX 3.3 3.34 -- 18 -- 10 20 0 0 28 -- 70 2.9 9 35 30 72 15 1.5 350 1.5 250 200 3.5 0 60 45 80 50 20 40 50 120 3.1 15 80 80 -- 20 4 450 3.0 400 600 10 25 SMFLHP2805S MIN 4.95 0 0 -- -- -- -- 19 -- -- -- -- -- -- 77 -- -- -- -- -- -- -- -- TYP MAX 5.00 5.05 -- 16 -- 15 30 0 0 28 -- 70 3.6 9 35 30 80 15 1.5 350 1.5 250 200 3.5 0 80 50 90 50 20 40 50 120 3.73 15 80 80 -- 20 4 450 3.0 400 600 10 25 SMFLHP2812S MIN TYP MAX 11.88 12.00 12.12 0 -- 7.5 0 -- -- -- -- 19 -- -- -- -- -- -- 81 -- -- -- -- -- -- -- -- -- 30 45 0 0 28 -- 50 3.8 9 35 30 86 15 1.5 450 1.5 250 200 3.5 0 90 85 150 50 20 40 50 80 3.95 15 80 80 -- 20 4 700 3.0 400 600 10 50 SMFLHP2815S MIN TYP MAX 14.8515.00 15.15 0 -- 6.67 0 -- -- -- -- 19 -- -- -- -- -- -- 82 -- -- -- -- -- -- -- -- -- 30 45 0 0 28 -- 50 4.2 9 35 30 87 15 1.5 450 1.5 250 200 3.5 0 100 95 175 50 20 40 50 80 4.40 15 80 80 -- 20 4 700 3.0 400 600 10 50 UNITS VDC A W mV p-p mV mV VDC V mA A mA CONDITION 25C VIN = 19 to 40 VDC VIN = 19 to 40 VDC Tc = 25C Tc = -55C to +125C VIN = 19 to 40 VDC NO LOAD TO FULL CONTINUOUS TRANSIENT1 50 ms NO LOAD FULL LOAD INHIBITED - INH1 INHIBITED - INH2 10 kHz - 10 MHz Tc = 25C POWER DISSIPATION SHORT CIRCUIT RECOVERY 50% - 100% - 50% TRANSIENT RECOVERY2 19 - 40 - 19 VDC TRANSIENT3 RECOVERY2 DELAY OVERSHOOT INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT Tc = 25C STEP LOAD RESP. mA pp % W ms mV pk ms mV pk s ms mV pk STEP LINE RESP. START-UP Notes 1. Unit will shut down above approximately 45V but will be undamaged and will restart when voltage drops into normal range. 2. Recovery time is measured from application of the transient to point at which Vout is within 1% of final value. 3. Transition time >10 s. DC/DC CONVERTERS Electrical Characteristics: DUAL OUTPUT MODELS PARAMETER OUTPUT VOLTAGE Tc = 25C OUTPUT CURRENT1 VIN = 19 TO 40 VDC OUTPUT POWER1 VIN = 19 TO 40 VDC OUTPUT RIPPLE VOLTAGE LINE REGULATION VIN = 19 TO 40 VDC LOAD REGULATION NO LOAD TO FULL INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT Tc = 25C CONDITIONS +VOUT -VOUT EACH OUTPUT TOTAL EACH OUTPUT TOTAL 10 kHz - 2 MHz +VOUT -VOUT +VOUT -VOUT +VOUT -VOUT CONTINUOUS TRANSIENT2 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 RECOVERY3 19 - 40 - 16 VIN TRANSIENT4 RECOVERY3 DELAY OVERSHOOT -- -- -- -- -- -- 19 0 -- -- -- -- -- 75 -- -- -- -- -- -- -- -- 25 25 0 25 0 25 28 -- 50 3.6 9 35 30 80 15 1.5 350 1.5 250 200 3.5 0 150 150 50 100 50 100 40 50 120 14 80 80 -- 20 4.0 450 3.0 600 300 20 25 -- -- -- -- -- -- 19 0 -- -- -- -- -- 81 -- -- -- -- -- -- -- -- 50 50 0 25 10 50 28 -- 50 3.8 9 35 30 86 15 1.5 450 1.5 250 200 3.5 0 175 175 50 100 100 200 40 50 120 14 80 80 -- 20 4.0 700 3.0 600 300 20 50 -- -- -- -- -- -- 19 0 -- -- -- -- -- 82 -- -- -- -- -- -- -- -- 50 50 0 25 10 50 28 -- 550 4.2 9 35 30 87 15 1.5 450 1.5 250 200 3.5 0 SMFLHP2805D MIN TYP MAX 4.95 5.00 5.05 4.92 5.00 5.08 0 0 0 0 -- -- -- -- 11.2 16.0 56 80 SMFLHP2812D MIN TYP MAX 11.88 12.00 12.12 11.82 12.00 12.18 0 0 0 0 -- -- -- -- 5.3 7.5 63 90 SMFLHP SERIES 100 WATT SMFLHP2815D MIN TYP MAX 14.85 15.00 15.15 14.77 15.00 15.23 0 0 0 0 -- -- -- -- 4.67 6.67 70 100 225 225 50 100 100 200 40 50 120 14 80 80 -- 20 4.0 700 3.0 600 300 20 50 UNITS VDC A W -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 FAULT Tc = 25C STEP LOAD RESPONSE VOUT STEP LINE RESPONSE VOUT START-UP Notes 1. Up to 70% of the total output power (current) is available from either output provided the opposite output is carrying 30% of the power (current) in use. 2. Unit will shut down above approximately 45V but will be undamaged and will restart when voltage drops into normal range. 3. Recovery time is measured from application of the transient to point at which Vout is within 1% of final value. 4. Transition time >10 s. SMFLHP SERIES 100 WATT 28V + - DC/DC CONVERTERS 1 2 3 4 5 6 Positive Input Input Common TR1 INH1 Sync Out Sync In MSTR/INH2 12 Slave 11 Pos. Sense 10 9 Sense Return 8 Output Common 7 Positive Output SINGLE OUTPUT MODELS CONNECTION DIAGRAMS - SENSE AND PARALLEL Inhibit Sync In - + RL 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 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 (MSTR/INH2) 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 (MSTR/INH2) Angled corner indicates pin one. SMFLHP SERIES 100 WATT 1 2 3 4 5 6 12 11 TOP VIEW SMFLHP (Pin side, marked side) 10 9 8 7 See cases "U maximum dimensions" and "U" for dimensions. FIGURE 3: PIN OUT MODEL NUMBERING KEY Base Model Input Voltage Output Voltage Number of Outputs (S = single, D = dual) Screening Radiation Level SMFLHP 28 05 S / K R Typical Performance Curves: 25C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified. 90 85 19V 90 85 19V 90 85 19V Efficiency (%) Efficiency (%) Efficiency (%) 80 75 70 65 60 10 30 28V 40V 80 75 70 65 28V 80 75 70 65 40V 28V 40V Output (Watts) 50 70 90 60 10 30 50 70 90 60 10 30 50 70 90 100 Output Power (Watts) Output Power (Watts) SMFLHP2805S & SMFLHP2805D Efficiency SMFLHP2812S & SMFLHP2812D Efficiency SMFLHP2815S & SMFLHP2815D Efficiency FIGURE 4 FIGURE 5 FIGURE 6 SMFLHP SERIES 100 WATT 0. 20. DC/DC CONVERTERS 100mV/div. 100% to 50% Typical Performance Curves: 25C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified. Attenuation (dB) 40. 60. 80. 20V/div. 100mV/div. Vout Vin 50% to 100% 100. 0.1 1 10 100 Frequency (kHz) SMFLHP Series Audio Rejection 50 s/div 19 to 40 V 1ms/div SMFLHP2805S Step Load Response SMFLHP2805S Step Line Response FIGURE 7 FIGURE 8 FIGURE 9 20V/div. 20V/div. 50% to 100% Vin +Vout Vin 1V/div. Vout 100mV/div. 200mV/div. 100% to 50% -Vout 1ms/div No Load 50 s/div 19 to 40 V 1ms/div SMFLHP2815D Step Load Response SMFLHP2805S Turn On Response SMFLHP2815D Step Line Response FIGURE 10 8 FIGURE 11 FIGURE 12 19 -Vout Voltage Change (%) 20V/div. 6 4 2 0 -2 -4 -6 -8 30 40 Input Voltage (Volts) VIN +Vout SMFLHP2805D SMFLHP2805S & 5D 18 SMFLHP2815S & 15D 17 SMFLHP2812D SMFLHP2815D 5V/div. -Vout SMFLHP2812S & 12D 50 60 70 16 30 40 50 60 70 80 90 100 1ms/div No Load SMFLHP2815D Turn On Response Output Load (%) +Pout 70 to 30 %, -Pout 30 to 70% Output Power (Watts) Cross Regulation Low Line Dropout FIGURE 13 FIGURE 14 FIGURE 15 SMFLHP Rev G (input ripple - error) October 6, 2005. This revision supercedes all previous releases. 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. SMFLHP Series is a trademark of Interpoint. Copyright (c) 1999-2005 Interpoint. All rights reserved. |
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