AHP28XXD SERIES HIGH RELIABILITY HYBRID DC/DC CONVERTERS Series D

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AHP28XXD SERIES HIGH RELIABILITY HYBRID DC/DC CONVERTERS Series D

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PD-97389
AHP28XXD SERIES HIGH RELIABILITY HYBRID DC/DC CONVERTERS
Series DC/DC converters feature high power density with derating over full military temperature range. This series offered part complete family converters providing single dual output voltages operating from nominal +270 volt inputs with output power ranging from watts. applications requiring higher output power, individual converters operated parallel. internal current sharing circuits assure equal current distribution among paralleled converters. This series incorporates International Rectifier's proprietary magnetic pulse feedback technology providing optimum dynamic line load regulation response. This feedback system samples output voltage pulse width modulator fixed clock frequency, nominally KHz. Multiple converters synchronized system clock range synchronization output converter. Undervoltage lockout, primary secondary referenced inhibit, soft-start load fault protection provided models. Also included input over-voltage protection, protection feature unique AHP. These converters hermetically packaged enclosure variations, utilizing copper core pins minimize resistive losses. Three lead styles available, each fabricated with International Rectifier's rugged ceramic lead-to-package seal assuring long term hermeticity most harsh environments. Manufactured facility fully qualified MIL-PRF38534, these converters available four screening grades satisfy wide range requirements. grade fully compliant requirements MIL-PRF38534 class grade processed screened class requirement, necessarily meet other MIL-PRF-38534 requirements, e.g., element evaluation Periodic Inspection (P.I.) required. Both grades tested meet complete group test specification over
Input, Dual Output
Features
Volt Input Range ±12, Volts Outputs Available High Power Density Watt Output Power Parallel Operation with Stress Current Sharing Input Over-Voltage Protection High Efficiency Continuous Short Circuit Overload Protection External Synchronization Port Remote Sensing Terminals Primary Secondary Referenced Inhibit Functions Line Rejection 50KHz Fault Tolerant Design Full Military Temperature Range Ceramic Feedthru Copper Core Pins Profile (0.380") Seam Welded Package Single Output Versions Available
full military temperature range without output power deration. grades with more limited screening also avail-able less demanding applications. Variations electrical, mechanical screening accommodated. Contact Santa Clara special requirements.
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04/16/09
AHP28XXD Series
Specifications
ABSOLUTE MAXIMUM RATINGS Input Voltage Soldering Temperature Case Temperature Operating Case Temperature Storage -0.5V 300°C seconds -55°C +125°C -65°C +135°C
Static Characteristics -55°C TCASE +125°C, 16V< unless otherwise specified.
Parameter INPUT VOLTAGE OUTPUT VOLTAGE AHP2805D AHP2812D AHP2815D AHP2805D AHP2812D AHP2815D OUTPUT CURRENT AHP2805D AHP2812D AHP2815D OUTPUT POWER AHP2805D AHP2812D AHP2815D MAXIMUM CAPACITIVE LOAD OUTPUT VOLTAGE TEMPERATURE COEFFICIENT OUTPUT VOLTAGE REGULATION Line Load Cross AHP2805D AHP2812D AHP2815D Group Subgroups Note 28V, 100% Load Positive Output Negative Output Positive Output Negative Output Positive Output Negative Output Positive Output Negative Output Positive Output Negative Output Positive Output Negative Output Notes Either Output Either Output Either Output Total Both Outputs Notes 6,11 10,000 -0.015 -0.5 -1.0 +0.015 +0.5 +1.0 Test Conditions 4.95 -5.05 11.88 -12.12 14.85 -15.15 4.90 -5.10 11.76 -12.24 14.70 -15.30 5.00 -5.00 12.00 -12.00 15.00 -15.00 5.05 -4.95 12.12 -11.88 15.15 -14.85 5.10 -4.90 12.24 -11.76 15.30 -14.70 12.8 Unit
%/°C
Each Output Note 28V, 100% Load Notes Note Load, Load, 100% Load Note Positive Output Negative Output Positive Output Negative Output Positive Output Negative Output
-1.0 -9.0 -1.0 -5.0 -1.0 -5.0
+1.0 +9.0 +1.0 +5.0 +1.0 +5.0
Notes Specifications, refer page
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AHP28XXD Series
Static Characteristics (Continued)
Parameter OUTPUT RIPPLE VOLTAGE AHP2805D AHP2812D AHP2815D INPUT CURRENT Load Inhibit Inhibit AHP2805D AHP2812D AHP2815D INPUT RIPPLE CURRENT AHP2805D AHP2812D AHP2815D CURRENT LIMIT POINT Expressed percentage Full Rated Load 28V, 100% Load Group Subgroups Test Conditions 40V, 100% Load, 10MHz Unit
mVpp
IOUT Shorted Shorted
mApp
VOUT VNOM, Equal current positive negative outputs Note
LOAD FAULT POWER DISSIPATION Overload Short Circuit EFFICIENCY AHP2805D AHP2812D AHP2815D ENABLE INPUTS (Inhibit Function) Converter Sink Current Converter Sink Current SWITCHING FREQUENCY SYNCHRONIZATION INPUT Frequency Range Pulse Amplitude, Pulse Amplitude, Pulse Rise Time Pulse Duty Cycle ISOLATION DEVICE WEIGHT MTBF
28V, 100% Load
-0.5 -0.5
Logical Note Logical High Note Note
Note Note Input Output Case (except Test 500VDC Slight Variations with Case Style MIL-HDBK-217F, 40°C
KHrs
Notes Specifications, refer page
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AHP28XXD Series
Dynamic Characteristics -55°C TCASE +125°C, VIN=28V unless otherwise specified.
Parameter LOAD TRANSIENT RESPONSE AHP2805D Either Output Amplitude Recovery Amplitude Recovery AHP2812D Either Output Amplitude Recovery Amplitude Recovery AHP2815D Either Output Amplitude Recovery Amplitude Recovery LINE TRANSIENT RESPONSE Amplitude Recovery TURN-ON CHARACTERISTICS Overshoot Delay LOAD FAULT RECOVERY LINE REJECTION Group Subgroups Notes Load Step 100% Load Step Load Step 100% Load Step Load Step 100% Load Step Notes Step Note Enable (Pins high open) Same Turn Characteristics. MIL-STD-461D, CS101, 30Hz 50KHz Note -500 -450 -450 Test Conditions Unit
-750 -750
-750 -750
Notes Specifications:
Parameters 100% tested guaranteed limits specified table. Recovery time measured from initiation transient where VOUT returned within Vout load. Line transient transition time Turn-on delay measured with input voltage rise time between volts millisecond. Current limit point that condition excess load causing output voltage drop nominal. Parameter verified part another test. electrical tests performed with remote sense leads connected output leads load. Load transient transition time Enable inputs internally pulled high. Nominal open circuit voltage 4.0VDC. Load current split equally between +VOUT -VOUT. Output load must distributed that minimum total output power being provided outputs. Cross regulation measured with load tested output maximum load while changing load other output from 70%.
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AHP28XXD Series
AHP28XXD Circuit Figure Dual Output Block Diagram
Input Input Filter Primary Bias Supply Current Sense Output Filter Sync Output Sync Input Case Input Return Control Error Share Amplifier Share Enable Trim Output Filter Output Output Return -Output
Enable
Circuit Operation Application Information
series converters employ forward switched mode converter topology. (refer block diagram Figure Operation device initiated when voltage whose magnitude within specified input voltage limits applied between pins enabled logical open) primary bias supply will begin generating regulated housekeeping voltage bringing circuitry primary side converter life. power MOSFET used chop input voltage into high frequency square wave, applying this chopped voltage power transformer nominal converter switching frequency. maintaining voltage within specified operating range input, continuous generation bias voltage assured. switched voltage impressed secondary output transformer windings rectified filtered provide positive negative converter output voltages. error amplifier secondary side compares positive output voltage precision reference generates error signal proportional difference. This error signal magnetically coupled through feedback transformer into control section converter varying pulse width square wave signal driving MOSFETs, narrowing pulse width output voltage high widening low. These pulse width variations provide necessary corrections regulate magnitude output voltage within its' specified limits. Because primary portion circuit coupled secondary side with magnetic elements, full isolation from input output maintained. Although incorporating several sophisticated useful ancilliary features, basic operation AHP28XXD
series initiated simply applying input voltage pins connecting appropriate loads between pins case with high power density converter, operation should initiated before secure attachment appropriate heat dissipator. (See Thermal Considerations, page Additional application information provided paragraphs following.
Inhibiting Converter Output
alternative application removal voltage input, user control converter output providing compatible, positive logic signals either enable pins (pin 12). distinction between these signal ports that enable (pin referenced input return (pin while enable (pin referenced output return (pin Thus, user access inhibit function either side isolation barrier. Each port internally pulled "high" that when used, open connection both enable pins permits normal converter operation. When their desired, logical "low" either port will shut converter down.
Figure Enable Input Equivalent Circuit
+5.6V 100K Disable 270K 2N3904 200K
1N4148
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AHP28XXD Series
Internally, these ports differ slightly their function. use, Enable completely shuts down circuits converter, while Enable shuts down secondary side while altering controller duty cycle near zero. Externally, either port transparent user save minor differences idle current. (See specification table). level +2.0 volts. sync output another converter which been designated master oscillator provides convenient frequency source this mode operation. When external synchronization indicated, sync should left open (unconnected )thereby permitting converter operate its' internally frequency. sync output signal continuous pulse train KHz, with duty cycle ±5%. This signal referenced input return been tailored compatible with sync input port. Transition times less than level output impedance less than ohms. This signal active when input voltage within specified operating range converter inhibited. This synch output adequate drive reserve synchronize least five additional converters. typical synchronization connection option illustrated Figure III.
Synchronization Multiple Converters
When operating multiple converters, system requirements often dictate operation converters common frequency. accommodate this requirement, series converters provide both synchronization input output. sync input port permits synchronization converter compatible external frequency source operating between KHz. This input signal should referenced input return have duty cycle. Compatibility requires transition times less than maximum level +0.8 volts minimum high
Figure III. Preferred Connection Parallel Operation
Power Input
Case Enable Sync Sync
Enable Share
Trim Output Return Output
Optional Synchronization Connection
Share
Case Enable Sync Sync
Enable Share
Trim Output Return Output
Negative Load Positive Load
Case Enable Sync Sync
Enable Share Trim Output Return Output
(Other Converters)
Parallel Operation-Current Stress Sharing
Figure III. illustrates preferred connection scheme operation converters with outputs operating parallel. this connection permits equal current sharing among members whose load current exceeds capacity individual AHP. important
feature series operating parallel mode that addition sharing current, stress induced temperature will also shared. Thus member paralleled operating higher case temperature, current provides load will reduced compensation temperature induced stress that
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AHP28XXD Series
device. When operating shared mode, important that symmetry connection maintained assurance optimum load sharing performance. Thus, converter outputs should connected load with equal lengths wire same gauge should connected common physical point, preferably load along with converter output return leads. converters paralleled must have their share pins connected together. This arrangement diagrammatically illustrated Figure III. showing output return pins connected star point which located close possible load. consequence topology utilized current sharing circuit, share used other functions. applications requiring only single converter, voltage appearing share used "total current monitor". share open circuit voltage nominally +1.00v load increases linearly with increasing total output current +2.20v full load. Note that current refer here total output current, that positive negative outout currents. conservative estimating total heat sink surface area (AHEAT SINK) required maximum case temperature rise above ambient temperature given following expression:
-143 HEAT SINK 0.85
where
Case temperature rise above ambient Device dissipation Watts POUT
example, assume that desired operate AHP2815D still environment where ambient temperature held constant +25°C while holding case temperature +85°C; then case temperature rise
Thermal Considerations
Because incorporation many innovative technological concepts, series converters capable providing very high output power from package very small volume. These magnitudes power density only obtained combining high circuit efficiency with effective methods heat removal from junctions. This requirement been effectively addressed inside device; when operating maximum loads, significant amount heat will generated this heat must conducted away from case. maintain case temperature below specified maximum 125°C, this heat must transferred conduction appropriate heat dissipater held intimate contact with converter base-plate. Since effectiveness this heat transfer dependent intimacy baseplate/heatsink interface, strongly recommended that high thermal conductivity heat transferring medium inserted between baseplate heatsink. material most frequently utilized factory during testing burn-in processes sold under trade name Sil-Pad® 4001 This particular product insulator electrically conductive versions also available. these materials assures maximum surface contact with heat dissipater thereby compensating minor surface variations. While other available types heat conductive materials thermal compounds provide similar effectiveness, these alternatives often less convenient somewhat messy use.
1Sil-Pad registered Trade Mark Bergquist, Minneapolis,
60°C
From Specification Table, worst case full load efficiency AHP2815D watts: thus, power dissipation full load given
(0.205) 20.5W
required heat sink area
-1.43
HEAT SINK 0.85 20.5
56.3
Thus, total heat sink surface area (including fins, any) this example, would limit case rise 60°C above ambient. flat aluminum plate, 0.25" thick approximate dimension side) would suffice this application still environment. Note that meet criteria this example, both sides plate require unrestricted exposure +25°C ambient air.
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AHP28XXD Series
Input Filter
AHP28XXD series converters incorporate single stage input filter whose elements dominate input load impedance characteristic during turn-on sequence. input circuit shown Figure
Figure Connection VOUT Adjustment
Enable Share
Figure Input Filter Circuit
3.5µH
AHP28xxD
Trim Vout Return Vout
RADJ
Loads
11.2
Connect Radj increase, decrease Table Output Voltage Trim Values Limits
AHP2805D AHP2812D Vout 12.5 12.4 12.3 12.2 12.1 12.0 11.7 11.3 10.8 10.6 10.417 Radj 47.5K 127K 285K 760K 975K 288K 72.9K 29.9K AHP2815D Vout 15.5 15.4 15.3 15.2 15.1 15.0 14.6 14.0 13.5 13.0 12.917 Radj 62.5K 167K 375K 1.0M 1.2M 325K 117K 12.5K
Input Over-Voltage Protection
additional protection feature incorporated into input circuit. input over-voltage protection. output will shutdown restart approximately 110% maximum rated input voltage. This protection feature unique AHP.
Vout 4.583
Radj 12.5K 33.3K 200K 190K 2.5K
Undervoltage Lockout
minimum voltage required input converter initiate operation. This voltage 14.0 volts. preclude possibility noise other variations input falsely initiating halting converter operation, hysteresis approximately volts incorporated this circuit. Thus input voltage droops 13.0 volts, converter will shut down remain inoperative until input voltage returns 14.0 volts.
Output Voltage Adjust
trim (10), magnitude output voltages adjusted over limited range either positive negative direction. Connecting resistor between trim either output return positive output will raise lower magnitude output voltages. span output voltage adjustment restricted limits shown Table
Note that nominal magnitude output voltage resides middle table corresponding resistor value magnitude greater than nominal, adjust resistor connected output return. magnitude less than nominal, adjust resistor connected positive output. (Refer Figure output voltage settings that within limits, between those listed Table suggested that resistor values determined empirically selection variable resistor. value thus determined then replaced with good quality fixed resistor permanent installation. When this adjust feature elected, user should aware that temperature performance converter output voltage will affected temperature performance resistor selected adjustment element therefore, advised employ resistors with tight temperature coefficient resistance.
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AHP28XXD Series
General Application Information
AHP28XXD series converters capable providing large transient currents user loads demand. Because nominal input voltage range this series relatively low, resulting input current demands will correspondingly large. important therefore, that line impedance kept very prevent steady state transient input currents from degrading supply voltage between voltage source converter input. applications requiring high static currents large transients, recommended that input leads made adequate size minimize resistive losses, that good quality capacitor approximately100µfd connected directly across input terminals assure adequately impedance input terminals. Table relates nominal resistance values selected wire sizes. this device were connected voltage source with feet gauge wire, round trip (input return) would result resistance volts drop from source converter. assure volts input, source closer volts would required. applications using paralleling option, this drop will multiplied number paralleled devices. choosing gauge wire this example, parasitic resistance resulting voltage drop will reduced that with gauge wire. Another potential problem resulting from parasitically induced voltage drop input lines with regard operation enable port. minimum maximum operating levels required operate this port specified with respect input common return line converter. logic signal generated with respect `common' that distant from converter, effects voltage drop over return line must considered when establishing worst case switching levels. These drops will effectively impart shift logic levels. Figure seen that referred system ground, voltage input return given
Table Nominal Resistance Wire Wire Size, Resistance 25.7 16.2 10.1
eRtn IRtn
Therefore, logic signal level generated system must capable logic high plus sufficient additional amplitude overcome eRtn. When converter inhibited, IRtn diminishes near zero eRtn will then system ground. Incorporation capacitor input terminals recommended compensation dynamic effects parasitic resistance input cable reacting with complex impedance converter input, provide energy reservoir transient input current requirements.
example effects parasitic resistance, consider AHP2815D operating full power From specification sheet, this device minimum efficiency which represents input power more than consider case where line voltage its' minimum volts, steady state input current necessary this example will slightly greater than Amps.
Figure Problems Parasitic Resistance input Leads
eRtn Case
esource
IRtn
System Ground
Enable Sync Sync
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AHP28XXD Series
AHP28XXD Case Outlines
Case Case
Variation Case
3.000 2.760
0.128
0.050 0.250
0.250 0.050
0.25
BERYLLIA WARNING: These converters hermetically sealed; however they contain substrates should ground subjected other operations including exposure acids, which produce Beryllium dust fumes containing Beryllium
1.260 1.500
1.000
0.200 Non-cum 0.040
1.000
2.500
0.220
0.220 2.800 0.525
0.040
2.975 0.238 0.380
0.42 0.380
Case
1.150 0.300 0.140 0.050
Case
Variation Case
0.050
0.250
0.250
1.500 1.750 2.00
1.000
0.200 Non-cum 0.040
1.000
1.750 2.500 2.975 0.238
0.375
0.220
0.220 0.36 2.800 0.525
0.040
0.380
0.380
Tolerances, unless otherwise specified:
.XXX
±0.010 ±0.005
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AHP28XXD Series Available Screening Levels Process Variations AHP28XXD Series.
Requirement Temperature Range Element Evaluation Internal Visual Temperature Cycle Constant Acceleration Burn-in Final Electrical (Group Seal, Fine Gross External Visual 2017 1010 2001, Axis 1015 MIL-PRF-38534 Specification 1014 2009 48hrs 85°C 25°C Cond MIL-STD-883 Method Suffix -20°C +85°C Suffix -55°C +125°C Suffix -55°C +125°C Suffix -55°C +125°C MIL-H-38534
Cond 500g 48hrs 125°C 25°C Cond
Cond 3000g 160hrs 125°C -55, +25, +125°C Cond
Cond 3000g 160hrs 125°C -55, +25, +125°C Cond
Commercial Standards
AHP28XXD Designation
Designation Positive Input Input Return Case Enable Sync Output Sync Input Positive Output Output Return Negative Output Output Voltage Trim Share Enable
Part Numbering
Model Input Voltage
270V
Screening Level
Blank screening
Case Style
Output Voltage
Outputs
Single Dual
WORLD HEADQUARTERS: Kansas St., Segundo, California 90245, Tel: (310) 3331 SANTA CLARA: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500 Visit www.irf.com sales contact information. Data specifications subject change without notice. 04/2009
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AHP28XXD SERIES HIGH RELIABILITY HYBRID DC/DC CONVERTERS Series D

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