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ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
7.5W DC-DC CONVERTER
DHD2805S
(315) 701-6751
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
MIL-PRF-38534 CERTIFIED
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
TYPICAL APPLICATIONS
Isolated Step Down Power Supply Microprocessor Power Source Low Voltage Subsystem Power Source 1 2 3 4 5
PIN-OUT INFORMATION
+Output -Output Adjust/Comp NC Shutdown Plus 8 Case 7 -Input 6 +Input
ABSOLUTE MAXIMUM RATINGS

1 TST Storage Temperature Range TLD Lead Temperature Range (10 Seconds) PD Power Dissipation TJ Junction Temperature JC Thermal Resistance (Switches)

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

+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

-65C to +150C
ELECTRICAL SPECIFICATIONS
Parameter
Test Conditions 1
Group A Subgroup
1 2,3
DHD2805S H/E Min.
4.95 4.80 120 120 65 60 16 12 10 100 1.6 375 10
DHD2805S Min.
4.90 120 63 16 12 10 100 1.5 350 10
Units Max.
5.10 1500 190 225 30 40 500 300 500 500 200 50 500 40 50 50 45 5 300 2.3 450 VDC VDC mA mA mVp-p mVp-p mAp-p mAp-p mV mV mV mV % % mV mV S S mV mV S S mV mV mS mS S S mS V V V mA mA mA mA F M A KHz %
Typ.
5.00 75 100 9 15 70 300 90 160 140 0 0 30 220 60 35 2 1.9 400 -
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 50 50 500 500 40 50 50 40 40 5 5 300 2.2 425 -
Typ.
5.00 75 100 9 15 70 300 90 160 140 0 30 220 60 35 2 1.9 400 -
Output Voltage Output Current 2
16VVIN40V
1 2,3
Output Voltage Ripple
BW=10KHz to 2MHz
1 2,3
Input Current Ripple 2
BW=10KHz to 2MHz
1 2,3
Line Regulation
VIN=16V to 40V VIN=28V IOUT=120mA to/from 1500mA
1 2,3
Load Regulation
1 2,3 1 2,3
Efficiency IOUT=500mA to/from 1000mA Transition TIme=30S IOUT=500mA to/from 1000mA Transition TIme=30S VIN=16V to/from 40V Transition Time=30S, IOUT=1A VIN=16V to/from 40V Transition Time=30S, IOUT=1A IOUT=1A
Step Load Response
4 5,6 4 5,6 4 5,6 4 5,6 4 5,6
Step Load Recovery
Step Line Response 2 Step Line Recovery 2
Start Up Overshoot
Start Up Delay
IOUT=0A and 1A
4 5,6 4 5,6 -
Shutdown Delay 2 Shutdown Recovery 2 POUT=7.5W MAX. Input Voltage Range 2 POUT=5W MAX. POUT=2.5W MAX. Enabled, IOUT=0mA Quiescent Current Disabled, IOUT=0mA Capacitive Load 2 Isolation Short Circuit Current Limit 7 Switching Frequency VOUT Adjustment Range RPOT=50K No Effect on DC Performance Input to output or any pin to case @ 500V
1,2,3 1,2,3 1,2,3 1 2,3 1 2,3 1,2,3 1 1 4 1
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
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 RESPONSE
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
50
INPUT VOLTAGE, VIN (V)
30%
EFFICIENCY CONTOURS
50
30%
EFFICIENCY CONTOURS
50
INPUT VOLTAGE, VIN (V)
30% 40%
INPUT VOLTAGE, VIN (V)
40%
TEMP = 25C
50% 55% 60%
TEMP = -55C
40% 50% 55%
40
40
40
50% 55% 60%
TEMP = 125C
30
63%
65% 68%
30
60% 63% 66%
30
66%
20
72%
70% 71%
20
68% 69% 70%
20
68% 69% 70%
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)
11 .12 .24 .48 .78 .96 1.2 OUTPUT CURRENT, IOUT (A)
16 TEMP = 25C
INPUT VOLTAGE, VIN (V)
OUTPUT DC CURRENT RATING
1V
14
12
1.2A
500mA
1V
VOUT
VOUT(1V/DIV) OUTPUT RESPONSE, X (UNITS/DIV)
LOW LINE DROP OUT
LOAD TRANSIENT RESPONSE
LOAD TRANSIENT RESPONSE 100F
VOUT
1.2A
500mA
IOUT
600mA
IOUT
600mA
10 0.0
NO OUTPUT BUS CAPCITANCE
INCLUDES 100F ON OUTPUT BUS
0.4 0.5
0.8 1.0
1.2 1.5
1.6 2.0
OUTPUT CURRENT, IOUT (A)
OUTPUT RESPONSE, VOUT(50mV/DIV) X (UNITS/DIV) 10V 50mV
TIME, t (100sec/DIV)
OUTPUT RESPONSE, VOUT(100mV/DIV) X (UNITS/DIV)
TIME, t (200sec/DIV)
LOAD TRANSIENT RESPONSE 1000F
OUTPUT RESPONSE, VOUT(1V/DIV) X (UNITS/DIV)
LINE TRANSIENT RESPONSE
LOAD = 1.2A VOUT
LINE TRANSIENT RESPONSE
INCLUDES 100F ON OUTPUT BUS
1V
VOUT
100mV
VOUT 80V LOAD = 1.2A
40V
1.2A
500mA
IOUT
600mA
16V VIN
INCLUDES 100F ON OUTPUT BUS
INCLUDES 1000F ON OUTPUT BUS
TIME, t (500sec/DIV)
TIME, t (200sec/DIV)
20V
VIN
11V
TIME, t (200sec/DIV)
TURN ON THRESHOLD
28
RESPONSE, X (UNITS/DIV) VOUT(2V/DIV) 10 V 2V TURN ON VOLTAGE, ETO (V)
TURN ON RESPONSE
0 LOAD = 1.2A 5.0V VOUT 0V 28V
AUDIO REJECTION, A V (dB)
AUDIO REJECTION
VIN = 28V IOUT = 1.2A
-20 -40 -60 -80
24
20
16
0V VIN
INCLUDES 100F ON OUTPUT BUS
12 10K 20K 30K 40K 60K 90K SET POINT RESISTOR, RSP ()
TIME, t (5msec/DIV)
-100 100 200 400 1K 2K 10K 20K FREQUENCY, f (Hz)
100K
6
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
Industrial Extended Reliability Mil-PRF-38534 Class H
Output Voltage
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

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