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Details, datasheet, quote on part number:DHC2803SH
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Datasheet text preview:
ISO-9001 CERTIFIED BY DSCC
M.S.KENNEDY CORP.
4707 Dey Road Liverpool, N.Y. 13088
6W DC-DC CONVERTERS
DHC2800S
SERIES
(315) 701-6751
FEATURES:
Wave Solderable Package All Ceramic Capacitors Surface Mount Magnetics Withstands 5000G MIL STD 461C CR03 (DC-DC Converters) 80 Volt Input Transient Tolerent No Derating - -55°C to +125°C Wide Supply Range - 10V to 50V High Isolation - 500V High Power Density - 17W/in³ Output Voltage Adjustment - Standard Remote Shutdown Operates to 11V Input at 5W Available with 3.3V or 5V Outputs See DAC2800s Series for 12V and 15V Versions Available to DSCC SMD 5962-94629 and 5962-93092
MIL-PRF-38534 CERTIFIED
DESCRIPTION:
The DHC2800S series of DC-DC converters 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. DHC2800S 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. DHC2800S 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. B 6/03
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
6.5°C/W
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Rev. B 6/03
+50V VIN Input Voltage (pin 7 to pin 6) Input Transient (pin 7 to pin 6 @ 50mS) 80V VINT Output Current IOUT DHC2803S 2.0A DHC2805S 1.5A Case Temperature Range TC DHC2800S H/E -55°C to +125°C DHC2800S -40°C to +85°C
TST Storage Temperature Range TLD Lead Temperature Range (10 Seconds) PD Power Dissipation TJ Junction Temperature JC Thermal Resistance (Switches)
-65°C to +150°C
300°C See Efficiency Curve 150°C
ELECTRICAL SPECIFICATIONS
DHC2803S
Parameter 8
Output Voltage 12VVIN50V Output Current 2 16VVIN50V BW=10KHz to 2MHz
Test Conditions 1
Group A Subgroup
1 2,3 1 2,3 1 2,3 1 2,3
DHC2803S H/E Min.
3.20 3.15 152 152 152 152 61 58 12 11 10 100 2.4 375 ±10
DHC2803S Min.
3.18 152 152 61 12 11 10 100 2.4 350 ±10
Units Max.
3.42 1520 1820 190 225 ±20 ±30 ±500 300 ±500 500 200 50 500 50 50 50 45 5 300 3.6 450 VDC VDC mA mA 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 µF M A KHz %
Typ.
3.30 85 165 ±6 ±10 66 ±300 85 ±190 120 0 0 30 220 60 35 2 3.1 400 -
Max.
3.40 3.45 1520 1520 1820 1820 190 475 200 200 ±15 ±50 ±25 ±50 ±500 ±750 300 300 ±500 ±500 500 200 200 50 50 500 500 50 50 50 40 5 300 3.6 425 -
Typ.
3.30 85 165 ±6 ±10 66 ±300 85 ±190 120 0 30 220 60 35 2 3.1 400 -
Output Voltage Ripple
Input Current Ripple 2
BW=10KHz to 2MHz
1 2,3
Line Regulation
VIN=16V to 40V VIN=16V, 28V and 40V IOUT=0A, 0.8A and 1.6A
1 2,3
Load Regulation
1 2,3 1 2,3
Efficiency IOUT=0.9A to/from 1.8A Transition TIme=30µS IOUT=0.9A to/from 1.8A Transition TIme=30µS VIN=16V to/from 40V Transition Time=30µS VIN=16V to/from 40V Transition Time=30µS
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
4 5,6
Shutdown Delay 2 Shutdown Recovery 2 POUT=6W MAX. Input Voltage Range 2 POUT=5W MAX. POUT=2.5W MAX. Quiescent Current Capacitive Load 2 Isolation Short Circuit Current Limit 7 Switching Frequency VOUT Adjustment Range RPOT=50K Enabled, IOUT=0mA Disabled IOUT=0mA No Effect on DC Performance Input to output or any pin to case @ 500V
4 5,6 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 = 1.8A for DHC2803S, IOUT = 1.0A for DHC2805S, 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 7 Device has internal shutdown feature that pulses the output with a low duty cycle during faults. 8 Refer to DSCC SMD for electrical specifications for devices purchased as such.
3
Rev. B 6/03
ELECTRICAL SPECIFICATIONS
DHC2805S
Parameter 8
Output Voltage 12VVIN50V Output Current 2 16VVIN50V BW=10KHz to 2MHz
Test Conditions 1
Group A Subgroup
1 2,3 1 2,3 1 2,3
DHC2805S H/E Min.
4.95 4.80 120 120 120 120 64 62 12 11 10 100 1.6 375 ±10
DHC2805S Min.
4.90 120 120 64 12 11 10 100 1.5 350 ±10
Units Max.
5.10 1200 1500 190 225 ±20 ±30 ±500 300 ±500 500 200 50 500 50 50 50 45 5 300 2.3 450 VDC VDC mA mA 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 µF M A KHz %
Typ.
5.00 75 100 ±6 ±10 69 ±300 90 ±160 140 0 0 30 220 60 35 2 1.9 400 -
Max.
5.05 5.20 1200 1200 1500 1500 190 475 200 200 ±15 ±50 ±25 ±50 ±500 ±750 300 300 ±500 ±500 500 200 200 50 50 500 500 50 50 50 40 5 300 2.2 425 -
Typ.
5.00 75 100 ±6 ±10 69 ±300 90 ±160 140 0 30 220 60 35 2 1.9 400 -
Output Voltage Ripple
1 2,3
Input Current Ripple 2
BW=10KHz to 2MHz
1 2,3
Line Regulation
VIN=16V to 40V VIN=16V, 28V and 40V IOUT=0A, 0.5A and 1A
1 2,3
Load Regulation
1 2,3 1 2,3
Efficiency IOUT=500mA to/from 1000mA Transition TIme=30µS IOUT=500mA to/from 1000mA Transition TIme=30µS VIN=16V to/from 40V Transition Time=30µS VIN=16V to/from 40V Transition Time=30µS IOUT=0A and 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=6W MAX. Input Voltage Range 2 POUT=5W MAX. POUT=2.5W MAX. Quiescent Current Capacitive Load 2 Isolation Short Circuit Current Limit 7 Switching Frequency VOUT Adjustment Range RPOT=50K Enabled, IOUT=0mA Disabled IOUT=0mA 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 = 1.8A for DHC2803S, IOUT = 1.0A for DHC2805S, 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 7 Device has internal shutdown feature that pulses the output with a low duty cycle during faults. 8 Refer to DSCC SMD for electrical specifications for devices purchased as such.
4
Rev. B 6/03
APPLICATION NOTES POWER SUPPLIES
The output voltage of the DHC2800S 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
The DHC2800S series of dc-dc converters share load fault philosophies. Load fault conditions include short-circuit and severe overload conditions. The DHC2800S converter series 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 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 1000µF to be accommodated on the DHC2805S 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 100µF 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= 210·10³ 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 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. 5 Rev. B 6/03
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