DHD2805S MSK | Alldatasheet
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Technical content
4707 Dey Road Liverpool, N.Y. 13088 (315) 701-6751 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 MIL-PRF-38534 CERTIFIED ISO-9001 CERTIFIED BY DSCC M.S.KENNEDY CORP. 7.5W DC-DC CONVERTER DHD2805S 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. Rev. C 3/05 FEATURES:
Isolated Step Down Power Supply Microprocessor Power Source Low Voltage Subsystem Power Source TYPICAL APPLICATIONS +Output -Output Adjust/Comp NC Shutdown Plus PIN-OUT INFORMATION Case -Input +Input -65°C to +150°C 300°C See Efficiency Curve 150°C 6.5°C/W ABSOLUTE MAXIMUM RATINGS +50V 80V 1.5A -55°C to +125°C -40°C to +85°C Input Voltage (pin 7 to pin 6) Input Transient (pin 7 to pin 6 @ 50mS) Output Current DHD2805S Case Temperature Range DHD2805S H/E DHD2805S VIN VINT IOUT TC Storage Temperature Range Lead Temperature Range (10 Seconds) Power Dissipation Junction Temperature Thermal Resistance (Switches) TST TLD PD TJ θJC Rev. C 3/05 NOTE:
1 Continuous operation at or above absolute maximum ratings may adversely effect
the performance and/or life cycle.
VIN=28V IOUT=120mA to/from 1500mA IOUT=500mA to/from 1000mA Transition TIme=30µS IOUT=500mA to/from 1000mA Transition TIme=30µS VIN=16V to/from 40V Transition Time=30µS, IOUT=1A VIN=16V to/from 40V Transition Time=30µS, IOUT=1A POUT=7.5W MAX. POUT=5W MAX. POUT=2.5W MAX. No Effect on DC Performance Input to output or any pin to case @ 500V RPOT=50KΩ 16V≤VIN≤40V BW=10KHz to 2MHz BW=10KHz to 2MHz VIN=16V to 40V IOUT=1A IOUT=0A and 1A Capacitive Load Isolation Short Circuit Current Limit Switching Frequency VOUT Adjustment Range ELECTRICAL SPECIFICATIONS VDC VDC mA mA mVp-p mVp-p mAp-p mAp-p mV mV mV mV mV mV µS µS mV mV µS µS mV mV mS mS µS µS mS V V V mA mA mA mA µF MΩ A KHz Min. 4.95 4.80 120 120 100 1.6 375 ±10 Output Voltage Output Voltage Ripple Input Current Ripple Line Regulation Load Regulation Efficiency Step Load Response Step Load Recovery Step Line Response Step Line Recovery Start Up Overshoot Start Up Delay Shutdown Delay Parameter Test Conditions Max. 5.05 5.20 1500 1500 190 475 200 200 ±25 ±50 ±35 ±50 ±500 ±750 300 300 ±500 ±500 500 500 200 200 500 500 300 2.2 425 DHD2805S DHD2805S H/E Input Voltage Range Output Current Units Typ. 5.00 100 ±15 ±300 ±160 140 220 1.9 400 Group A Subgroup 2,3 2,3 2,3 2,3 2,3 2,3 2,3 5,6 5,6 5,6 5,6 5,6 5,6 5,6 1,2,3 1,2,3 1,2,3 2,3 2,3 1,2,3 Min. 4.90 120 100 1.5 350 ±10 Max. 5.10 1500 190 225 ±30 ±40 ±500 300 ±500 500 200 500 300 2.3 450 Typ. 5.00 100 ±15 ±300 ±160 140 220 1.9 400 Rev. C 3/05 Shutdown Recovery Quiescent Current +VIN = 28V, IOUT = 1.5A, TA=TC=25°C 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=+25°C 2, 5 TA=TC=+125°C 3, 6 TA=TC= -55°C Device has internal shutdown feature that pulses the output with a low duty cycle during faults. NOTES: Enabled, IOUT=0mA Disabled, IOUT=0mA
The output voltage of the DHD2805S may be adjusted from 90% to 110% of nominal value by the use of a 50KΩ potenti- ometer 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 tem- perature performance will change. Characterization by the user is recommended in such applications. Adjust/comp (pin 3) may be driven by external circuitry refer- enced 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 10KΩ or more if connection of the comp function is also required. The comp function of pin 3 allows capacitive loads as large as 1000µF 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 recom- mended when low ESR load capacitances of 100µF or greater are used. Rev. C 3/05 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 resis- tor 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= (±10% accuracy at 25°C) 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 con- verters 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 resis- tor >400KΩ from pin 5 to 7 provides pull down for pin 5 if there is no input setpoint programming resistor already in place. 210·10³ ETO-9.5 LOAD FAULT RESPONSE Load fault conditions include short-circuit and severe over- load 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 125°C. Current beyond rated can flow into the load at startup time. This al- lows the converter to bring up capacitive and other difficult load types more reliably than competing converters.
Rev. C 3/05 TYPICAL APPLICATION CIRCUIT
0.0 1.6 OUTPUT CURRENT, IOUT (A) LOW LINE DROP OUT INPUT VOLTAGE, VIN (V) 0.4 0.8 1.2 10K 90K 60K 20K 30K 40K INPUT VOLTAGE, VIN (V) TIME, t (500µsec/DIV) LOAD TRANSIENT RESPONSE 1000µF LINE TRANSIENT RESPONSE EFFICIENCY CONTOURS OUTPUT RESPONSE, X (UNITS/DIV) OUTPUT CURRENT, IOUT (A) .96 .12 .24 .48 .78 1.2 SET POINT RESISTOR, RSP (Ω) TIME, t (5msec/DIV) TURN ON THRESHOLD TURN ON VOLTAGE, ETO (V) TURN ON RESPONSE 100 200 400 FREQUENCY, f (Hz) –100 AUDIO REJECTION AUDIO REJECTION, AV (dB) –20 –40 1K 2K 10K 20K 100K –60 –80 RESPONSE, X (UNITS/DIV) 5.0V 28V VOUT VIN TEMP = 25°C TEMP = 25°C 30% 40% 50% 55% 60% 65% 68% 70% 71% 72% INPUT VOLTAGE, VIN (V) EFFICIENCY CONTOURS OUTPUT CURRENT, IOUT (A) TEMP = 125°C 30% 40% 50% 55% 60% 63% 66% 68% 69% 70% INPUT VOLTAGE, VIN (V) EFFICIENCY CONTOURS OUTPUT CURRENT, IOUT (A) .96 .24 .12 .48 .78 1.2 .96 .24 .12 .48 .78 1.2 TEMP = –55°C 30% 40% 50% 55% 68% 69% 70% 60% 66% 63% INCLUDES 1000µF ON OUTPUT BUS TIME, t (200µsec/DIV) TIME, t (200µsec/DIV) TIME, t (200µsec/DIV) LOAD TRANSIENT RESPONSE 100µF OUTPUT RESPONSE, X (UNITS/DIV) OUTPUT RESPONSE, X (UNITS/DIV) OUTPUT RESPONSE, X (UNITS/DIV) INCLUDES 100µF ON OUTPUT BUS INCLUDES 100µF ON OUTPUT BUS INCLUDES 100µF ON OUTPUT BUS INCLUDES 100µF ON OUTPUT BUS TIME, t (100µsec/DIV) LOAD TRANSIENT RESPONSE OUTPUT RESPONSE, X (UNITS/DIV) 1.2A LOAD = 1.2A LOAD = 1.2A LOAD = 1.2A 1.2A 600mA 600mA VOUT VOUT VOUT VOUT VIN VIN 11V 16V 600mA 80V 40V 1.2A VOUT IOUT IOUT IOUT 1 V 500mA 1 V 500mA 100mV 20V 50mV 10V 1 V 10 V 2 V 500mA NO OUTPUT BUS CAPCITANCE VIN = 28V IOUT = 1.2A OUTPUT DC CURRENT RATING TYPICAL PERFORMANCE CURVES Rev. C 3/05 VOUT(50mV/DIV) VOUT(1V/DIV) VOUT(2V/DIV) VOUT(100mV/DIV) VOUT(1V/DIV) VOUT(1V/DIV) 2.0 1.5 1.0 0.5
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. M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751 FAX (315) 701-6572 www.mskennedy.com Rev. C 3/05
ORDERING INFORMATION
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED ESD TRIANGLE INDICATES PIN 1 Screening Level DHD2805S DHD2805SE DHD2805SH Part Number Industrial Extended Reliability Mil-PRF-38534 Class H Output Voltage 5.0V WEIGHT=14.5 GRAMS TYPICAL CONTAINS INTERNAL BeO (BERYLLIUM OXIDE)