ISO-9001 CERTIFIED BY DSCC M.S.KENNEDY CORP. 7.5W DC-DC CONVERTER DHD2805S 4707 Dey Road Liverpool, N.Y. 13088 (315) 701-6751 HI-REL DESIGN • • • • WAVE SOLDERABLE PACKAGE ALL CERAMIC CAPACITORS SURFACE MOUNT MAGNETICS WITHSTANDS 5000G FEATURES — SINGLE OUTPUT • • • • • • REPLACES APEX DHW2805S NO DERATING — -55°C to +125°C WIDE SUPPLY RANGE — 16V to 40V HIGH ISOLATION — 500V HIGH POWER DENSITY — 17W/IN3 OUTPUT VOLTAGE ADJUSTMENT — STANDARD • REMOTE SHUTDOWN • OPERATES TO 11VIN AT 5W • AVAILABLE WITH 5V OUTPUT TYPICAL APPLICATION WITH OPTIONS 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. This is accomplished while retaining a power density of 17 W/in3 and 425 mW/gram of power/package performance. The use of advanced substrate and reflow soldering techniques during construction results in a rugged, cost-effective, and completely solderable package. DHD2805S hybrid converter series 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 +35 V while the shutdown pin will withstand +50 V 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 400 KHz 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. BLOCK DIAGRAM 6 1 2 PWM FEED FORWARD CONTROLLER 5 7 ERROR AMPLIFIER REFERENCE AND ISOLATION 3 EXTERNAL CONNECTIONS 1 2 3 4 5 1 +OUTPUT -OUTPUT ADJUST/COMP NO CONNECTION SHUTDOWN PLUS 8 CASE 7 -INPUT 6 +INPUT Rev. - 3/01 ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS DHD2805S ABSOLUTE MAXIMUM RATINGS DHD2805S 0-50Vdc 80V @ 50ms 35Vdc 1.2Adc –65°C, 150°C 300°C INPUT VOLTAGE RANGE (Pin 7 to 6 or 5) INPUT TRANSIENT (Pin 7 to 6) OUTPUT WITHSTAND (Pin 2 to 1 or 3) OUTPUT CURRENT (Continuous) TEMPERATURE, Storage TEMPERATURE, Pin Soldering 10s DHD2805S SPECIFICATIONS PARAMETER TEST CONDITIONS1 MIN TYP MAX UNITS STEADY STATE CHARACTERISTICS INPUT VOLTAGE RANGE5 OUTPUT VOLTAGE OUTPUT CURRENT VIN; min ↔ max Vdc @ IMIN VIN; min ↔ max Vdc 16 5.00 120 28 5.05 40 5.10 1500 Vdc Vdc mAdc EFFICIENCY OUTPUT RIPPLE VOLTAGE INPUT RIPPLE CURRENT Bandwidth 10kHz ↔ 1MHz Bandwidth 10kHz ↔ 1MHz 62 67 40 40 80 100 % mVrms mArms OUTPUT POWER2 LINE REGULATION LOAD REGULATION VIN; min ↔ max3 IOUT; min ↔ max3 9 15 7.5 25 35 W mVdc mVdc 125 45 2.5 %/°C °C mAdc mAdc TEMPERATURE COEFFICIENT TEMPERATURE RANGE, case2 QUIESCENT CURRENT INHIBITED IOUT = 0A Vpin5; < 8Vdc ISOLATION CHARACTERISTICS (input/output/case) LEAKAGE RESISTANCE LEAKAGE CAPACITANCE VTEST = 500Vdc f = 10kHz DYNAMIC CHARACTERISTICS LINE STEP RESPONSE VOLTAGE CHANGE RECOVERY TIME (95%) LOAD STEP RESPONSE VOLTAGE CHANGE RECOVERY TIME (95%) DYNAMIC CHARACTERISTICS START-UP OVERSHOOT SHUTDOWN DELAY SHUTDOWN RECOVERY TIME4 NOTES: 1. 2. 3. 4. 5. CAUTION CAUTION: 0.6 .006 –55 38 1.25 .09 100 VIN; TR, TF = 10µs VIN; 16 ↔ 40 Vdc IOUT; TR, TF = 10µs IOUT; 50% ↔ max Adc VIN; 0-50 Vdc VPIN5; > 10Vdc → <8Vdc VPIN5; < 8Vdc → > 10Vdc 60 MΩ pF 300 30 mV µs 700 40 mV µs 0 220 400 500 60 mV µs ms Unless otherwise stated: TC = 25°C, VIN = 28V, IOUT = IOUT MAX. Derate power linearly to zero from 125°C to 135°C. Regulation measured between pin 1 and pin 2 1/6" from case. Recovery spec assumes that converter has been OFF for at least 500ms. Input voltage can be increased to 12V to 50V at 5W output power. The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or subject to temperatures in excess of 850°C to avoid generating toxic fumes. PACKAGE THERMAL SPECIFICATIONS MIN RESISTANCE, case to air TEMPERATURE RISE, junction to case 2 TYP MAX UNITS 30 10 15 °C/W °C Rev. - 3/01 TYPICAL PERFORMANCE GRAPHS DHD2805S EFFICIENCY CONTOURS EFFICIENCY CONTOURS 30% TEMP = 25°C 40% 50% 55% 40 60% 30 65% 68% 70% 71% 20 TEMP = –55°C 40% 40 50% 55% 30 60% 63% 66% 20 68% 69% TEMP = 125°C 50% 55% 40 60% 63% 30 66% 20 68% 69% 70% 70% LOAD TRANSIENT RESPONSE 100µF IOUT 600mA INCLUDES 1000µF ON OUTPUT BUS 40V 16V VIN INCLUDES 100µF ON OUTPUT BUS TIME, t (500µsec/DIV) TIME, t (200µsec/DIV) TURN ON THRESHOLD TURN ON RESPONSE 20 16 12 10K 20K 30K 40K 60K 90K SET POINT RESISTOR, RSP (Ω) INCLUDES 100µF ON OUTPUT BUS 5.0V VOUT 28V 0V VIN INCLUDES 100µF ON OUTPUT BUS TIME, t (5msec/DIV) 3 LOAD = 1.2A VIN 11V TIME, t (200µsec/DIV) 0 0V VOUT 80V LOAD = 1.2A RESPONSE, X (UNITS/DIV) 10 V 2V 24 INCLUDES 100µF ON OUTPUT BUS LINE TRANSIENT RESPONSE 100mV LOAD = 1.2A VOUT 28 600mA IOUT TIME, t (200µsec/DIV) LINE TRANSIENT RESPONSE OUTPUT RESPONSE, X (UNITS/DIV) 10V 50mV 1V 500mA 1.2A 500mA TIME, t (100µsec/DIV) LOAD TRANSIENT RESPONSE 1000µF VOUT NO OUTPUT BUS CAPCITANCE VOUT 1.2A 20V 0.4 0.8 1.2 1.6 OUTPUT CURRENT, IOUT (A) 600mA IOUT OUTPUT RESPONSE, X (UNITS/DIV) 10 0.0 1.2A AUDIO REJECTION, A V (dB) 12 500mA OUTPUT DC CURRENT RATING 14 VOUT 1V LOAD TRANSIENT RESPONSE OUTPUT RESPONSE, X (UNITS/DIV) LOW LINE DROP OUT 1V 11 .12 .24 .48 .78 .96 1.2 OUTPUT CURRENT, IOUT (A) OUTPUT RESPONSE, X (UNITS/DIV) 11 .12 .24 .48 .78 .96 1.2 OUTPUT CURRENT, IOUT (A) TEMP = 25°C INPUT VOLTAGE, VIN (V) 30% 40% 11 .12 .24 .48 .78 .96 1.2 OUTPUT CURRENT, IOUT (A) 16 OUTPUT RESPONSE, X (UNITS/DIV) 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. - 3/01 APPLICATION INFORMATION DHD2805S SERIES OUTPUT ADJUST / COMP LOAD FAULT RESPONSE The output voltage of the DHD2805S may be adjusted from 90% to 110% of nominal value by the use of a 50KΩ 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 DHC2800 converter series responds to load faults by turning off all power conversion circuits for 250 mS and then attempting to restart for 10 mS (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 allows the converter to bring up capacitive and other difficult load types more reliably than competing converters. 3 1 2 50K 10nF Vo O 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 1.3 V 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 1000 µF to be accommodated on the DHC2805S without loss of stability. This feature may be utilized by connecting a 10 nF capacitor between pins 3 and 1. This is generally recommended when low ESR load capacitances of 100 µF or greater are used. Io O NORMAL LOAD FAULT NORMAL TIME 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 2.5 mA, 25 Vdc 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: 3 R = 210 • 10 ETO – 9.5 (±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 10 V to below 1 V when a load fault causes the converters fault protection circuitry to activate. It will remain low for at least 100 ms and return high. If the load fault is still present pin 5 will return low and the cycle will repeat. A resistor > 400 KΩ from pin 5 to 7 provides pull down for pin 5 if there is no input setpoint programming resistor already in place. 4 Rev. - 3/01 MECHANICAL SPECIFICATIONS NOTE: ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED. ESD Triangle indicates Pin 1. DHD2805S ORDERING INFORMATION SCREENING BLANK= INDUSTRIAL; E= EXTENDED RELIABILITY; H= CLASS H; K= CLASS K SINGLE OUTPUT OUTPUT VOLTAGE 05=5V NOMINAL INPUT VOLTAGE GENERAL PART NUMBER The above example is an industrial grade 5V single output converter M.S. Kennedy Corp. 4707 Dey Road, Liverpool, New York 13088 Phone (315) 701-6751 FAX (315) 701-6752 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. 5 Rev. - 3/01