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PD - 94549A
ATR28XXS SERIES HYBRID-HIGH RELIABILITY DC/DC CONVERTERS
Description
The ATR28XXS Series of DC/DC converters feature high power density and an extended temperature range for use in military and industrial applications. Designed to MIL-STD-704D input requirements, these devices have nominal 28VDC inputs with 3.3V, 5V, 12V and 15V single outputs to satisfy a wide range of requirements. The circuit design incorporates a pulse width modulated single forward topology operating in the feed-forward mode at a nominal switching frequency of 550KHz. Input to output isolation is achieved through the use of transformers in the forward and feedback circuits. The advanced feedback design provides fast loop response for superior line and load transient characteristics and offers greater reliability and radiation tolerance than devices incorporating optical feedback circuits. Three standard temperature grades are offered with screening options. Refer to Part Number section. These devices can be provided in a standard plug-in package for PC mounting or in a flanged package for more severe environments. These converters are manufactured in a facility certified to MIL-PRF-38534. All processes used to manufacture these converters have been qualified to enable Advanced Analog to deliver compliant devices. Four screening grades are available to satisfy a wide range of requirements. The CH grade converters are fully compliant to MIL-PRF-38534 for class H. The HB grade converters are processed to full class H screening but do not have class H element evaluation as required by MIL-PRF-38534. Both grades are fully tested to confirm operation over the full military temperature range without derating of output power. The ES version is a full temperature device without the full class H or element evaluation. The non-suffix device is a low cost limited temperature range option. Variations in electrical, mechanical and screening can be accommodated.
28V Input, Single Output
ATR Features
n 16 to 40 VDC Input Range (28 VDC Nominal) n 3.3V, 5V, 12V and 15V Outputs Available n Indefinite Short Circuit and Overload Protection 3 n Up to 35 W/in Power Density n 30 Watt Output Power Models n Fast Loop Response for Superior Transient Characteristics n Operating Temperature Range from -55C to +125C n Popular Industry Standard Pin-Out n Resistance Seam Welded Case for Superior Long Term Hermeticity n Ceramic Feed-thru Pins n External Synchronization n Efficiencies up to 84% n Shutdown from External Signal n Military Screening
Extensive computer simulation using complex modeling enables rapid design modification to be provided. Contact IR Santa Clara with specific requirements.
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04/01/04
ATR28XXS Series
Specifications
ABSOLUTE MAXIMUM RATINGS Input Voltage -0.5V to 50V Soldering Temperature 300C for 10 seconds Case Temperature Operating -55C to +125C Storage -65C to +135C
ATR2803R3S
Table I. Electrical performance Characteristics
Test Symbol Conditions -55C TC +125C VIN = 28VDC 5%, CL = 0 Unless otherwise specified IOUT = 0 VIN = 16, 28, and 40 VDC VIN = 16, 28, and 40 VDC B.W. = 20Hz to 2 MHz VIN = 16, 28, and 40 VDC IOUT = 0, 3000, and 6000mA VIN = 16,28, and 40 VDC IOUT = 0, 3000, and 6000mA IOUT = 0, inhibit (pin 2) Tied to input return (pin 10) IOUT = 0, inhibit (pin 2) = open IOUT =6000mA B.W. = 20Hz to 2 MHz IOUT =6000mA Input to output or any pin to case (except pin 8) at 500 VDC, TC =+25C No effect on dc performance TC =+25C 6 Overload, TC = +25C Short Circuit IOUT = 7500mA IOUT = 7500mA Load step 50% to/from 100% Load step 50% to/from 100% Load step 50% to/from 100% Load step 50% to/from 100% VOTLINE Input step 16V to/from 40VDC, IOUT = 7500mA Group A Subgroups Device Types Limits Min 1 2,3 1,2,3 1,2,3 1 2,3 1,2,3 1,2,3 1,2,3 1 2,3 1 4 1 1,2,3 4,5,6 4,5,6 4,5,6 4,5,6 4 5,6 4 5,6 4,5,6 01 01 01 01 01 01 01 01 01 01 01 01 01 01 500 500 -500 -500 74 70 100 500 12 9 600 700 +500 +500 100 200 100 200 500 3.25 3.20 Max 3.35 3.40 7500 60 20 30 50 18 50 50 V mA mV p-p mV mV mA mA p-p % M F W KHz KHz mV pk Units
Output voltage Output current Output ripple voltage Line regulation
3 1 2
VOUT IOUT VRIP VRLINE VRLOAD IIN
2
Load regulation Input current
3
Input ripple current Efficiency Isolation Capacitive load
IRIP EFF ISO
4, 5
CL PD FS FSYNC VOTLOAD TTLOAD
Power dissipation load fault Switching frequency Sync frequency range Output response to step 7 transient load changes Recovery time step 7, 8 transient load changes Output response to transient 5, 9 step line changes
01 01
s mV pk
For Notes to Specifications, refer to page 3
2
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ATR28XXS Series ATR2803R3S
Device Types Limits Min 4,5,6 4,5,6 4,5,6 4,5,6 01 01 01 01 Max 10 350 25 25 ms mV pk ms ms Units
Table I. Electrical performance Characteristics - continued
Symbol Conditions -55C TC +125C VIN = 28VDC 5%, CL = 0 Unless otherwise specified Input step 16V to/from 40VDC, IOUT = 7500mA IOUT = 10% to 100% of Load IOUT =0 and 7500mA Group A Subgroups
Recovery time transient step 5, 8, 9 line changes Turn on overshoot 10 Turn on delay 5, 10 Load fault recovery
TTLINE VTonOS TonD TrLF
Notes to Specifications
1 2 3 4 Parameter guaranteed by line and load regulation tests. Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz. Output voltage measured at load with remote sense leads connected across load. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn on. 5 Parameter shall be tested as part of design characterization and after design or process changes. Thereafter parameters shall be guaranteed to the limits specified in table I. 6 An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 7 Load step transition time between 2 and 10 microseconds. 8 Recovery time is measured from the initiation of the transient to where VOUT has returned to within 1 percent of VOUT at 50 percent load. 9 Input step transition time between 2 and 10 microseconds. 10 Turn on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 2) while power is applied to the input.
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ATR28XXS Series Specifications
ABSOLUTE MAXIMUM RATINGS Input Voltage -0.5V to 50V Soldering Temperature 300C for 10 seconds Case Temperature Operating -55C to +125C Storage -65C to +135C
ATR2805S
Table II. Electrical performance Characteristics
Test Symbol Conditions -55C TC +125C VIN = 28VDC 5%, CL = 0 Unless otherwise specified IOUT = 0 VIN = 16, 28, and 40 VDC VIN = 16, 28, and 40 VDC B.W. = 20Hz to 2 MHz VIN = 16, 28, and 40 VDC IOUT = 0, 3000, and 6000mA VIN = 16,28, and 40 VDC IOUT = 0, 3000, and 6000mA IOUT = 0, inhibit (pin 2) Tied to input return (pin 10) IOUT = 0, inhibit (pin 2) = open IOUT =6000mA B.W. = 20Hz to 2 MHz IOUT =6000mA Input to output or any pin to case (except pin 8) at 500 VDC, TC =+25C No effect on dc performance TC =+25C 6 Overload, TC = +25C Short Circuit IOUT = 6000mA IOUT = 6000mA 3000mA to/from 6000mA 500mA to/from 3000mA 3000mA to/from 6000mA 500mA to/from 3000mA Output response to transient 5, 9 step line changes VOTLINE Input step 16V to/from 40VDC, IOUT = 6000mA Group A Subgroups Device Types Limits Min 1 2,3 1,2,3 1,2,3 1 2,3 1,2,3 1,2,3 01 01 01 01 4.95 4.90 Max 5.05 5.10 6000 60 20 30 50 18 50 50 76 72 100 V mA mV p-p mV Units
Output voltage Output current 2 Output ripple voltage Line regulation
3 1
VOUT IOUT VRIP VRLINE
3
Load regulation Input current
VRLOAD IIN
2
01 01
mV mA
Input ripple current Efficiency Isolation
4, 5
IRIP EFF ISO
1,2,3 1 2,3 1
01 01 01
mA p-p % M F W
Capacitive load
CL PD FS FSYNC VOTLOAD TTLOAD
4 1
01
500 12
Power dissipation load fault Switching frequency Sync frequency range Output response to step 7 transient load changes Recovery time step 7, 8 transient load changes
01 1,2,3 4,5,6 4,5,6 4,5,6 4,5,6 4 5,6 4 5,6 4,5,6 01 01 01 500 500 -500 -500 9 600 700 +500 +500 100 200 100 200 500
KHz KHz mV pk
01
s
01
mV pk
For Notes to Specifications, refer to page 5
4
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ATR28XXS Series Table II. Electrical performance Characteristics - continued
Test Symbol Conditions -55C TC +125C VIN = 28VDC 5%, CL = 0 Unless otherwise specified Input step 16V to/from 40VDC, IOUT = 6000mA IOUT =0 and 6000mA IOUT =0 and 6000mA Group A Subgroups Device Types
ATR2805S
Limits Min Max 10 500 25 25 ms mV pk ms ms Units
Recovery time transient step 5, 8, 9 line changes Turn on overshoot 10 Turn on delay 5, 10 Load fault recovery
TTLINE VTonOS TonD TrLF
4,5,6 4,5,6 4,5,6 4,5,6
01 01 01 01
Notes to Specifications
Parameter guaranteed by line and load regulation tests. Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz. Output voltage measured at load with remote sense leads connected across load. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn on. 5 Parameter shall be tested as part of design characterization and after design or process changes. Thereafter parameters shall be guaranteed to the limits specified in table II. 6 An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 7 Load step transition time between 2 and 10 microseconds. 8 Recovery time is measured from the initiation of the transient to where VOUT has returned to within 1 percent of VOUT at 50 percent load. 9 Input step transition time between 2 and 10 microseconds. 10 Turn on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 2) while power is applied to the input. 1 2 3 4
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ATR28XXS Series Specifications
ABSOLUTE MAXIMUM RATINGS Input Voltage -0.5V to 50V Soldering Temperature 300C for 10 seconds Case Temperature Operating -55C to +125C Storage -65C to +135C
ATR2812S
Table III. Electrical performance Characteristics
Test Symbol Conditions -55C TC +125C VIN = 28VDC 5%, CL = 0 Unless otherwise specified IOUT = 0 VIN = 16, 28, and 40 VDC VIN = 16, 28, and 40 VDC B.W. = 20Hz to 2 MHz VIN = 16, 28, and 40 VDC IOUT = 0, 1250, and 2500mA VIN = 16,28, and 40 VDC IOUT = 0, 1250, and 2500mA IOUT = 0, inhibit (pin 2) Tied to input return (pin 10) IOUT = 0, inhibit (pin 2) = open IOUT =2500mA B.W. = 20Hz to 2 MHz IOUT=2500mA Input to output or any pin To case (except pin 8) at 500 VDC, TC =+25C No effect on dc performance TC =+25C 6 Overload, TC = +25C Short Circuit IOUT = 2500mA IOUT = 2500mA 1250mA to/from 2500mA 200mA to/from 1250mA 1250mA to/from 2500mA 200mA to/from 1250mA Output response to transient step line 5, 9 changes VOTLINE Input step 16V to/from 40VDC, IOUT = 2500mA Group A Subgroups Device Types Min 1 2,3 1,2,3 1,2,3 1 01 2,3 1 01 2,3 1,2,3 01 1 2,3 1,2,3 1 2,3 1 50 75 50 80 75 100 120 18 mA 60 60 mV 01 01 01 11.88 11.70 Limits Max 12.12 12.30 2500 60 30 mV V mA mVp-p Units
Output voltage Output current 2 Output ripple voltage Line regulation
3 1
VOUT IOUT VRIP VRLINE
3
Load regulation
VRLOAD
Input current
IIN
Input ripple current Efficiency Isolation
2
IRIP EFF ISO
01 01 01
mAp-p % M F
Capacitive load
4, 5
CL PD
4 1
01
500 12
Power dissipation load fault Switching frequency Sync frequency range Output response to step 7 transient load changes Recovery time step 7, 8 transient load changes
01 FS FSYNC VOTLOAD TTLOAD 1,2,3 4,5,6 4,5,6 4,5,6 4,5,6 4 5,6 4 5,6 4,5,6 01 01 01 500 500 -800 -1000 9 600 700 +800 +1000 100 200 100 200 1200
W KHz KHz mV pk
01
s
01
mV pk
For Notes to Specifications, refer to page 7
6
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ATR28XXS Series Table III. Electrical performance Characteristics - continued
Test Symbol Conditions -55C TC +125C VIN = 28VDC 5%, CL = 0 Unless otherwise specified Input step 16V to/from 40VDC, IOUT = 2500mA IOUT =0 and 2500mA IOUT =0 and 2500mA Group A Subgroups Device Types Min 4,5,6 4,5,6 4,5,6 4,5,6 01 01 01 01 Limits Max 10 800 25 25 ms mV pk ms ms
ATR2812S
Units
Recovery time transient 5, 8, 9 step line changes Turn on overshoot 10 Turn on delay 5, 10 Load fault recovery
TTLINE VTonOS TonD TrLF
Notes to Specifications
Parameter guaranteed by line and load regulation tests. Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz. Output voltage measured at load with remote sense leads connected across load. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn on. 5 Parameter shall be tested as part of design characterization and after design or process changes. Thereafter parameters shall be guaranteed to the limits specified in table III. 6 An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is the condition of maximum power dissipation. 7 Load step transition time between 2 and 10 microseconds. 8 Recovery time is measured from the initiation of the transient to where VOUT has returned to within 1 percent of V OUT at 50 percent load. 9 Input step transition time between 2 and 10 microseconds. 10 Turn on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin 2) while power is applied to the input. 1 2 3 4
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ATR28XXS Series Specifications
ABSOLUTE MAXIMUM RATINGS Input Voltage -0.5V to 50V Soldering Temperature 300C for 10 seconds Case Temperature Operating -55C to +125C Storage -65C to +135C
ATR2815S
Table IV. Electrical performance Characteristics
Test Symbol Conditions -55C TC +125C VIN = 28VDC 5%, CL = 0 Unless otherwise specified IOUT = 0 VIN = 16, 28, and 40 VDC each output. VIN = 16, 28, and 40 VDC B.W. = 20Hz to 2 MHz VIN = 16, 28, and 40 VDC IOUT = 0, 1250, and 2500mA VIN = 16,28, and 40 VDC IOUT = 0, 1250, and 2500mA IOUT = 0, inhibit (pin 2) Tied to input return (pin 10) IOUT = 0, Inhibit (pin 2) = open IOUT = 2500mA B.W. = 20Hz to 2 MHz IOUT = 2500mA Input to output or any pin to case (except pin 7) at 500 VDC, TC =+25C No effect on dc performance, TC =+25C. Total for both outputs 6 Overload, TC = +25C Short Circuit IOUT = 2500mA IOUT = 2500mA 1000mA to/from 2000mA 167mA to/from 1000mA 1000mA to/from 2000mA 167mA to/from 1000mA Output response to transient step line 5, 9 changes VOTLINE Input step 16V to/from 40VDC, IOUT = 2000mA Group A Subgroups Device Types Min 1 2,3 1,2,3 1,2,3 1 01 2,3 1 01 2,3 1,2,3 01 1 2,3 1,2,3 1 2,3 1 75 100 50 79 75 100 150 18 mA 75 75 mV 01 01 01 14.85 14.60 Limits Max 15.15 15.40 2000 75 35 mV V mA mVp-p Units
Output voltage Output current
1
VOUT IOUT
3
Output ripple voltage Line regulation
3
VRIP VRLINE
Load regulation
3
VRLOAD
Input current
IIN
Input ripple current Efficiency Isolation
4
2
IRIP EFF ISO
01 01 01
mAp-p % M F
Capacitive load
4, 5
CL
4
01
500
Power dissipation load fault Switching frequency Sync frequency range Output response to step 7 transient load changes Recovery time step 7, 8 transient load changes
4
PD
1 01 1,2,3 4,5,6 4,5,6 4,5,6 4,5,6 4 5,6 4 5,6 4,5,6
12 W 500 500 -1000 -1000 9 600 700 +1000 +1000 100 200 100 200 1500 KHz KHz mVp-k
FS FSYNC VOTLOAD TTLOAD
01 01 01
01
s
01
mVpk
For Notes to Specifications, refer to page 9
8
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ATR28XXS Series Table IV. Electrical performance Characteristics - continued
Test Symbol Conditions -55C TC +125C VIN = 28VDC 5%, CL = 0 Unless otherwise specified Input step 16V to/from 40VDC, IOUT = 2500mA IOUT =0 and 2000mA IOUT =0 and 2000mA Group A Subgroups Device Types Min 4,5,6 4,5,6 4,5,6 4,5,6 01 01 01 01 Limits Max 10 1000 25 25 ms mVpk ms ms
ATR2815S
Units
Recovery time transient 5, 8, 9 step line changes Turn on overshoot 10 Turn on delay 5, 10 Load fault recovery
TTLINE VTonOS TonD TrLF
Notes to Specifications
1 2 3 4 Parameter guaranteed by line and load regulation tests. Bandwidth guaranteed by design. Tested for 20 KHz to 2 MHz. Output voltage measured at load with remote sense leads connected across load. Capacitive load may be any value from 0 to the maximum limit without compromising dc performance. A capacitive load in excess of the maximum limit will not disturb loop stability but may interfere with the operation of the load fault detection circuitry, appearing as a short circuit during turn on. Parameter shall be tested as part of design characterization and after design or process changes. Thereafter parameters shall be guaranteed to the limits specified in table IV. An overload is that condition with a load in excess of the rated load but less than that necessary to trigger the short circuit protection and is condition of maximum power dissipation. Load step transition time between 2 and 10 microseconds. Recovery time is measured from the initiation of the transient to where VOUT has returned to within 1 percent of VOUT at 50 percent l load. Input step transition time between 2 and 10 microseconds. Turn on delay time measurement is for either a step application of power at the input or the removal of a ground signal from the inhibit pin (pin2) while power is applied to the input.
5 6 7 8 9 10
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ATR28XXS Series
ATR28XXS Block Diagram
1 +In put EM I F ilter 5 +V o ut
2 E n ab le 8 C a se 9 S ync Inp ut R e turn 10
P rim a ry H o useke ep in g S u pp ly
4
R e turn
D rive
P u lse W id th FB M o du la tor
CS
E rror Am p & Ref
6 +S e nse 3 -S e nse
Application Information
Inhibit Function
Connecting the inhibit input (Pin 2) to input common (Pin 10) will cause the converter to shut down. It is recommended that the inhibit pin be driven by an open collector device capable of sinking at least 400A of current. The open circuit voltage of the inhibit input is 11.5 1 VDC.
Thermal Management
Assuming that there is no forced air flow, the package temperature rise above ambient (T) may be calculated using the following expression:
T = 80 A -0.7 P 0.85 (C)
where A = the effective surface area in square inches (Including heat sink if used),Pd = power dissipation in watts. The total surface area of the ATR package is 7.34 square inches. If a worse case full load efficiency of 76% is assumed, then the case temperature rise of an ATR2805S can be calculated as follows:
1 1 P = Pout - 1 = 30 - 1 = 9.5W Eff 76
EMI Filter
An Optional EMI filter (AFC461)is available that will reduce the input ripple current to levels below the limits imposed by MIL-STD-461B CEO3.
Output Voltage Adjustment
The output voltage of the ATR2805S converter can be adjusted upward by connecting an appropriate resistor value between the Positive Output (Pin 5) and the Positive Sense (Pin 6) as shown in Table 1 below.
Resistance Pin 5 to 6 () 109 240 400 600 857 1200 Output Voltage Increase (V) 0.1 0.2 0.3 0.4 0.5 0.6
T = 80 (7.34)-0.7 (9.5)0.85 = 134C
Hence, if TAMBIENT = +25C, the DC/DC converter case temperature will be approximately 159C if no heat sink or air flow is provided. To calculate the heat sink area required to maintain a specific case temperature rise, the above equation may be manipulated as follows:
Table1 Output adjustment resistor values for ATR2805S
Device Synchronization
Whenever multiple DC/DC converters are utilized in a single system, significant low frequency noise may be generated due to slight difference in the switching frequencies of the converters. Because of the low frequency nature of this noise (typically less than 10KHz), it is difficult to filter out and may interfere with proper operation of sensitive systems. Advanced Analog permits synchronization of multiple ATR28XX converters to match switching frequency of the converter to the frequency of the system clock, thus eliminating this type of noise.
T AHEATSINK = 0.85 80Pd
-1.43
- APKG
As an example, if a maximum case temperature rise of 50C above ambient is required, then the required effective heat sink area is:
50 AHEATSINK = 0.85 80(9.5 )
-1.43
- 7.34 = 22.9in 2
10
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ATR28XXS Series
ATR28XXS Case Outlines Flanged
O 0.162 2 H oles 0.050 0.800
Non-Flanged
0.040 D X 0.26 L Pins
10
1
9
2
2.880 M ax
2.550
2.110 M ax
4 X 0.400 =1.600
2.110
8
3
7
4
6
5
0.390 M ax
1.110
0.390 M ax
Pin Designation
Pin No. 1 2 3 4 5 6 7 8 9 10 Designation Positive Input Enable Input Return Sense* Output Return Positive Output Positive Sense* N/C Case Ground Sync. Input Common
Part Numbering
ATR 28 15 S F / CH
Model Input Voltage
28 = 28V Nominal
Screening
-
, ES, HB, CH
Package Style Outputs
S = Single D = Dual T = Triple
F = Flange Omit for Non-flange
Output Voltage
Single - 03R3 = 3.3V, 05 = 5V 12 = 12V, 15 = 15V Dual - 12 = 12V, 15 = 15V Triple - 12 = 5V,12V 15 = 5V,15V
* If neither remote sense nor voltage trim is used, connect
Pin 3 to 4 and 5 to 6 or output voltage will increase by 1.2V.
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ATR28XXS Series
Available Screening Levels and Process Variations for ATR28XXS Series
Requirement Temperature Range Element Evaluation Internal Visual Temperature Cycle Constant Acceleration Burn-in Final Electrical (Group A) Seal, Fine & Gross External Visual MIL-STD-883 Method No Suffix -20 to +85C ES Suffix -55C to +125C HB Suffix -55C to +125C CH Suffix -55C to +125C MIL-PRF-38534 2017 1010 2001 1015 MIL-PRF38534 1014 2009 48hrs @ 85C 25C Yes Cond B 500g 48hrs @ 125C 25C Yes Cond C Cond A 160hrs @ 125C -55, +25, +125C Yes Cond C Cond A 160hrs @ 125C -55, +25, +125C
Cond A, C Yes
Cond A, C Yes
Cond A, C Yes
* Per Commercial Standards
Available Standard Military Drawing (SMD) Cross Reference
Standard Military drawing PIN 5962-9462401 5962-9462501 5962-9462601 Vendor CAGE Code 52467 52467 52467 Vendor Similar PIN ATR2805S/CH ATR2812S/CH ATR2815S/CH
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 252-7105 IR SANTA CLARA: 2270 Martin Av., Santa Clara, California 95050, Tel: (408) 727-0500 Visit us at www.irf.com for sales contact information. Data and specifications subject to change without notice. 04/2004
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