ISO-9001 CERTIFIED BY DSCC M.S.KENNEDY CORP. 7.5W DC-DC CONVERTER 4707 Dey Road Liverpool, N.Y. 13088 DHD2805S (315) 701-6751 MIL-PRF-38534 CERTIFIED FEATURES: Typical Efficiency 70% All Ceramic Capacitors Surface Mount Magnetics 80 Volt Input Transient Tolerant Operates to 12V Input at 5W Wide Supply Range - 16V to 40V High Isolation - 500V Output Voltage Adjustment - Standard Remote Shutdown 5V Output (See DHC Series for Other Voltages) Replaces IR ASA2805S Replaces Interpoint MSA2805S DESCRIPTION: The DHD2805S DC-DC converter provides the ruggedness, reliability and features required to meet the advanced design challenges of today's hi-rel market. The use of advanced substrate and reflow soldering techniques during construction results in a rugged, cost-effective and completely solderable package. DHD2805S hybrid converter utilizes all ceramic capacitors and surface mount magnetics to provide reliable operation at all operating temperatures while surviving very high G forces. DHD2805S standard features include output fault monitoring and/or turn on voltage point programming via the shutdown pin. All three functions may be implemented simultaneously with a minimum of external components. An output voltage adjustment/load compensation pin is also standard. Fault tolerant design protects these converters from most external circuit faults. The output and output adjust pins will withstand +35V while the shutdown pin will withstand +50V protecting the converters from a variety of system or board faults i.e. solder bridges, etc. Unique load fault protection circuitry allows this converter to pull up loads having difficult static load line characteristics and allows short term load excursions significantly beyond ratings in most applications. A transformer isolated forward converter topology operating at a switching frequency of 400kHz allows operation over a wide input voltage range. Internal filtering of both input and output eliminates the need for external capacitors in many applications. The 8-pin DIP package is hermetically sealed and isolated from the internal circuits. Heat sinking is recommended for full power operation at elevated ambient temperatures. 1 Rev. C 3/05 EQUIVALENT SCHEMATIC PIN-OUT INFORMATION TYPICAL APPLICATIONS 1 2 3 4 5 Isolated Step Down Power Supply Microprocessor Power Source Low Voltage Subsystem Power Source +50V VIN Input Voltage (pin 7 to pin 6) Input Transient (pin 7 to pin 6 @ 50mS) 80V VINT Output Current IOUT DHD2805S 1.5A Case Temperature Range TC DHD2805S H/E -55C to +125C DHD2805S -40C to +85C 8 Case 7 -Input 6 +Input 1 ABSOLUTE MAXIMUM RATINGS +Output -Output Adjust/Comp NC Shutdown Plus TST Storage Temperature Range TLD Lead Temperature Range (10 Seconds) PD Power Dissipation TJ Junction Temperature JC Thermal Resistance (Switches) -65C to +150C 300C See Efficiency Curve 150C 6.5C/W NOTE: 1 Continuous operation at or above absolute maximum ratings may adversely effect the performance and/or life cycle. 2 Rev. C 3/05 ELECTRICAL SPECIFICATIONS Group A Subgroup Test Conditions 1 Parameter 2 Output Voltage Ripple Input Current Ripple 2 Line Regulation Load Regulation Step Load Recovery Step Line Response 2 Step Line Recovery 2 Start Up Overshoot Start Up Delay Min. Typ. Max. 5.00 5.05 4.90 5.00 5.10 VDC - 5.20 - - - VDC 1 120 - 1500 120 - 1500 mA 2,3 120 - 1500 - - - mA 1 - 75 190 - 75 190 mVp-p 2,3 - - 475 - - - mVp-p 1 - 100 200 - 100 225 mAp-p 2,3 - - 200 - - - mAp-p 1 - 9 25 - 9 30 mV 2,3 - - 50 - - - mV VIN=28V 1 - 15 35 - 15 40 mV IOUT=120mA to/from 1500mA 2,3 - - 50 - - - mV 1 65 70 - 63 70 - % 2,3 60 - - - - - % IOUT=500mA to/from 1000mA 4 - 300 500 - 300 500 mV 16VVIN40V BW=10KHz to 2MHz BW=10KHz to 2MHz VIN=16V to 40V Transition TIme=30S 5,6 - - 750 - - - mV IOUT=500mA to/from 1000mA 4 - 90 300 - 90 300 S Transition TIme=30S 5,6 - - 300 - - - S VIN=16V to/from 40V 4 - 160 500 - 160 500 mV Transition Time=30S, IOUT=1A 5,6 - - 500 - - - mV VIN=16V to/from 40V 4 - 140 500 - 140 500 S Transition Time=30S, IOUT=1A 5,6 - - 500 - - - S 4 - 0 200 - 0 200 mV 5,6 - 0 200 - - - mV 4 - 30 50 - 30 50 mS 5,6 - - 50 - - - mS 4 - 220 500 - 220 500 S 5,6 - - 500 - - - S - - 60 - - 60 - mS POUT=7.5W MAX. 1,2,3 16 - 40 16 - 40 V POUT=5W MAX. 1,2,3 12 - 50 12 - 50 V POUT=2.5W MAX. 1,2,3 10 - 50 10 - 50 V 1 - 35 40 - 35 45 mA 2,3 - - 40 - - - mA 1 - 2 5 - 2 5 mA 2,3 - - 5 - - - mA No Effect on DC Performance 1,2,3 - - 300 - - 300 F Input to output or any pin to case @ 500V 1 100 - - 100 - - M IOUT=1A IOUT=0A and 1A Enabled, IOUT=0mA Quiescent Current Disabled, IOUT=0mA Isolation Max. 4.80 Shutdown Recovery 2 Capacitive Load 2 Typ. 4.95 Shutdown Delay 2 Input Voltage Range 2 Units Min. 1 Efficiency Step Load Response DHD2805S 2,3 Output Voltage Output Current DHD2805S H/E Short Circuit Current Limit 7 1 1.6 1.9 2.2 1.5 1.9 2.3 A Switching Frequency 4 375 400 425 350 400 450 KHz 1 10 - - 10 - - % VOUT Adjustment Range RPOT=50K NOTES: 1 2 3 4 5 6 +VIN = 28V, IOUT = 1.5A, TA=TC=25C unless otherwise specified. Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only. Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise specified. Military grade devices ("H" suffix) shall be 100% tested to subgroups 1, 2, 3 and 4. Subgroups 5 and 6 testing available upon request. Subgroup 1, 4 TA=TC=+25C 2, 5 TA=TC=+125C 3, 6 TA=TC= -55C 7 Device has internal shutdown feature that pulses the output with a low duty cycle during faults. 3 Rev. C 3/05 APPLICATION NOTES POWER SUPPLIES LOAD FAULT RESPONSE The output voltage of the DHD2805S may be adjusted from 90% to 110% of nominal value by the use of a 50K potentiometer as shown. Adjustment beyond this range is possible however certain characteristics of the converter such as but not limited to input voltage range, efficiency, ripple and temperature performance will change. Characterization by the user is recommended in such applications. Load fault conditions include short-circuit and severe overload conditions. The DHD2805S converter responds to load faults by turning off all power conversion circuits for 250mS and then attempting to restart for 10mS (typical). The net "on" duty factor during a fault is very low resulting in low converter dissipation and immunity from overheating at 125C. Current beyond rated can flow into the load at startup time. This allows the converter to bring up capacitive and other difficult load types more reliably than competing converters. Adjust/comp (pin 3) may be driven by external circuitry referenced to pin 2 (-output) if desired. Grounding pin 3 causes voltage to increase (25% typically) while driving pin 3 above 1.3V causes output voltage to decrease. Pin 3 may be driven through 10K or more if connection of the comp function is also required. The comp function of pin 3 allows capacitive loads as large as 1000F to be accommodated on the DHD2805S without loss of stability. This feature may be utilized by connecting a 10nF capacitor between pins 3 and 1. This is generally recommended when low ESR load capacitances of 100F or greater are used. SHUTDOWN PLUS Pin 5 is used for remote shutdown, output fault detection, and/or setting the input voltage point at which the converter will turn on as shown in the typical application diagram. No connection to pin 5 is necessary for normal operation of the converter. Pin 5 is referenced to the -input (pin 7). Shutdown may be implemented by simply connecting pin 5 to an open collector logic output or switch rated at 2.5mA, 25Vdc or higher. Input voltage turn on point is programmed with a single resistor from pin 5 to 7. An input turn on/off hysteresis (typically 3.5% of Vin) will be observed. This should be considered when making or verifying set point adjustment. The value of the setpoint resistor may be determined by the following: R= 210*10 ETO-9.5 (10% accuracy at 25C) Set point temperature coefficient is typically +400ppm/C. Output fault monitoring is accomplished by observing pin 5 with a high impedance monitoring circuit. Pin 5 voltage drops from over 10V to below 1V when a load fault causes the converters fault protection circuitry to activate. It will remain low for at least 100mS and return high. If the load fault is still present pin 5 will return low and the cycle will repeat. A resistor >400K from pin 5 to 7 provides pull down for pin 5 if there is no input setpoint programming resistor already in place. 4 Rev. C 3/05 TYPICAL APPLICATION CIRCUIT 5 Rev. C 3/05 TYPICAL PERFORMANCE CURVES EFFICIENCY CONTOURS EFFICIENCY CONTOURS 30% TEMP = 25C 40% 50% 55% 40 60% 30 65% 68% 70% 71% 20 TEMP = -55C 40% 40 50% 55% 30 60% 63% 66% 20 68% 69% TEMP = 125C 50% 55% 40 60% 63% 30 66% 20 68% 69% 70% 70% LOAD TRANSIENT RESPONSE 100F 1.2 1.5 1.6 2.0 LOAD TRANSIENT RESPONSE 1000F LINE TRANSIENT RESPONSE VOUT 500mA 1.2A IOUT 600mA INCLUDES 1000F ON OUTPUT BUS OUTPUT RESPONSE, V XOUT (UNITS/DIV) (50mV/DIV) 10V 50mV TIME, t (100sec/DIV) 1V OUTPUT CURRENT, IOUT (A) LOAD = 1.2A VOUT 40V 16V VIN INCLUDES 100F ON OUTPUT BUS TIME, t (200sec/DIV) TURN ON THRESHOLD TURN ON RESPONSE 16 12 10K 20K 30K 40K 60K 90K SET POINT RESISTOR, RSP () RESPONSE, XV(UNITS/DIV) OUT(2V/DIV) 10 V 2V 20 INCLUDES 100F ON OUTPUT BUS VOUT 28V 0V VIN INCLUDES 100F ON OUTPUT BUS 6 LOAD = 1.2A VIN 11V TIME, t (200sec/DIV) 5.0V TIME, t (5msec/DIV) VOUT 80V LOAD = 1.2A 0V INCLUDES 100F ON OUTPUT BUS LINE TRANSIENT RESPONSE 0 28 600mA IOUT TIME, t (200sec/DIV) TIME, t (500sec/DIV) 24 500mA NO OUTPUT BUS CAPCITANCE 100mV 0.8 1.0 VOUT 1.2A 20V 0.4 0.5 600mA IOUT OUTPUT RESPONSE, V XOUT (UNITS/DIV) (100mV/DIV) 10 0.0 1.2A AUDIO REJECTION, A V (dB) 12 500mA OUTPUT DC CURRENT RATING 14 VOUT 1V LOAD TRANSIENT RESPONSE OUT(1V/DIV) OUTPUT RESPONSE, XV(UNITS/DIV) LOW LINE DROP OUT 1V 11 .12 .24 .48 .78 .96 1.2 OUTPUT CURRENT, IOUT (A) OUTPUT RESPONSE, X (UNITS/DIV) VOUT (1V/DIV) 11 .12 .24 .48 .78 .96 1.2 OUTPUT CURRENT, IOUT (A) TEMP = 25C OUTPUT RESPONSE, V X OUT (UNITS/DIV) (1V/DIV) 30% 40% 11 .12 .24 .48 .78 .96 1.2 OUTPUT CURRENT, IOUT (A) 16 INPUT VOLTAGE, VIN (V) INPUT VOLTAGE, VIN (V) 30% 50 72% TURN ON VOLTAGE, ETO (V) EFFICIENCY CONTOURS 50 INPUT VOLTAGE, VIN (V) INPUT VOLTAGE, VIN (V) 50 -20 AUDIO REJECTION VIN = 28V IOUT = 1.2A -40 -60 -80 -100 100 200 400 1K 2K 10K 20K FREQUENCY, f (Hz) 100K Rev. C 3/05 MECHANICAL SPECIFICATIONS WEIGHT=14.5 GRAMS TYPICAL CONTAINS INTERNAL BeO (BERYLLIUM OXIDE) ESD TRIANGLE INDICATES PIN 1 ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED ORDERING INFORMATION Part Number DHD2805S DHD2805SE DHD2805SH Screening Level Output Voltage Industrial Extended Reliability Mil-PRF-38534 Class H 5.0V M.S. Kennedy Corp. 4707 Dey Road, Liverpool, New York 13088 Phone (315) 701-6751 FAX (315) 701-6572 www.mskennedy.com The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make changes to its products or specifications without notice, however, and assumes no liability for the use of its products. Please visit our website for the most recent revision of this datasheet. 7 Rev. C 3/05