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PD - 94549B
ATR28XXS SERIES
28V Input, Single Output
HYBRID-HIGH RELIABILITY DC/DC CONVERTER
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. Manufactured in a facility fully qualified to MIL-PRF38534, these converters are fabricated utilizing DSCC qualified processes. For available screening options, refer to device screening table in the data sheet. Variations in electrical, mechanical and screening can be accommodated. Extensive computer simulation using complex modeling enables rapid design modification to be provided. Contact IR Santa Clara with specific requirements.
ATR Features
16V to 40VDC Input Range (28VDC Nominal) 3.3V, 5V, 12V and 15V Outputs Available Indefinite Short Circuit and Overload Protection 3 Up to 35W/in Power Density 30W Output Power Models Fast Loop Response for Superior Transient Characteristics Operating Temperature Range from -55C to +125C Popular Industry Standard Pin-Out Resistance Seam Welded Case for Superior Long Term Hermeticity Ceramic Feed-thru Pins External Synchronization Efficiencies up to 84% Shutdown from External Signal Military Screening Standard Microcircuit Drawings Available
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01/15/07
ATR28XXS Series
Specifications
Absolute Maximum Ratings
Input voltage Soldering temperature Operating case temperature Storage case temperature -0.5V to +50VDC 300C for 10 seconds -55C to +125C -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% Output response to transient 5, 9 step line changes 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 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 9.0 600 700 +500 +500 100 200 100 200 500 01 01 01 01 3.25 3.20 Max 3.35 3.40 7500 60 20 30 50 18 50 50 74 70 100 500 12 W KHz KHz mV pk V mA mV p-p mV Units
Output voltage Output current 2 Output ripple voltage Line regulation
3 1
VOUT IOUT VRIP VRLINE VRLOAD IIN
2
Load regulation Input current
3
01 01 01 01 01 01
mV mA mA p-p % M F
Input ripple current Efficiency Isolation
IRIP EFF ISO
Capacitive load
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
01
s
01
mV pk
For Notes to Specifications, refer to page 3
2
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ATR28XXS Series
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 Device Types
ATR2803R3S
Limits Min Max 10 350 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 20KHz to 2.0MHz. 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. There after 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 2.0s and 10s. 8 Recovery time is measured from the initiation of the transient to where VOUT has returned to within 1.0% of V OUT at 50% load. 9 Input step transition time between 2.0s and 10s. 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 Soldering temperature Operating case temperature Storage case temperature -0.5V to +50VDC 300C for 10 seconds -55C to +125C -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 1,2,3 1 2,3 1 4 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 01 01 01 500 500 -500 -500 9.0 600 700 +500 +500 100 200 100 200 500 01 01 01 01 4.95 4.90 Max 5.05 5.10 6000 60 20 30 50 18 50 50 76 72 100 500 12 W KHz KHz mV pk V mA mV p-p mV Units
Output voltage Output current 2 Output ripple voltage Line regulation
3 1
VOUT IOUT VRIP VRLINE VRLOAD IIN
2
Load regulation Input current
3
01 01 01 01 01 01
mV mA mA p-p % M F
Input ripple current Efficiency Isolation
IRIP EFF ISO
Capacitive load
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
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
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 Limits Min 4,5,6 4,5,6 4,5,6 4,5,6 01 01 01 01
ATR2805S
Units
Max 10 500 25 25 ms mV pk ms ms
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
Parameter guaranteed by line and load regulation tests. Bandwidth guaranteed by design. Tested for 20KHz to 2.0MHz. 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. There after 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 2.0s and 10s. 8 Recovery time is measured from the initiation of the transient to where VOUT has returned to within 1.0% of V OUT at 50% load. 9 Input step transition time between 2.0s and 10s. 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 Soldering temperature Operating case temperature Storage case temperature -0.5V to +50VDC 300C for 10 seconds -55C to +125C -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 V IN = 16, 28, and 40 VDC V IN = 16, 28, and 40 VDC B.W. = 20Hz to 2 MHz VIN = 16, 28, and 40 VDC IOUT = 0, 1250, and 2500mA V IN = 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 2,3 1 01 2,3 1,2,3 01 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 01 500 500 -800 -1000 80 75 100 500 12 9.0 600 700 +800 +1000 100 200 100 200 1200 50 75 50 01 01 01 01 11.88 11.70 Limits Max 12.12 12.30 2500 60 30 60 60 120 18 V mA mVp-p mV Units
Output voltage Output current Output ripple voltage Line regulation
3 1 2
VOUT IOUT VRIP VRLINE VRLOAD IIN
Load regulation Input current
3
mV
mA mAp-p % M F W KHz KHz mV pk
Input ripple current Efficiency Isolation
4, 5
2
IRIP E FF ISO CL PD FS FSYNC VOTLOAD TTLOAD
Capacitive load
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
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
ATR2812S
Units
Max 10 800 25 25 ms mV pk ms ms
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 20KHz to 2.0MHz. 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. There after 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 2.0s and 10s. 8 Recovery time is measured from the initiation of the transient to where VOUT has returned to within 1.0% of VOUT at 50% load. 9 Input step transition time between 2.0s and 10s. 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 Soldering temperature Operating case temperature Storage case temperature -0.5V to +50VDC 300C for 10 seconds -55C to +125C -65C to +135C
ATR2815S
Table IV. Electrical performance Characteristics
Test Symbol Conditions -55C TC +125C V IN = 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 VO TLINE Input step 16V to/from 40VDC, IOUT = 2000mA Group A Subgroups Device Types Min 1 2,3 1,2,3 1,2,3 1 2,3 1 01 2,3 1,2,3 1 2,3 1,2,3 1 2,3 1 4 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 01 01 01 500 500 -1000 -1000 9.0 600 700 +1000 +1000 100 200 100 200 1500 01 01 01 01 01 14.85 14.60 Limits Max 15.15 15.40 2000 75 35 75 75 150 18 75 100 50 79 75 100 500 12 W KHz KHz mVp-k V mA mVp-p mV Units
Output voltage Output current
1 3
VOUT IOUT VRIP VRLINE VRLOAD
Output ripple voltage Line regulation
3
Load regulation Input current
3
mV mA
IIN
Input ripple current Efficiency Isolation
4, 5 4
2
IRIP EFF ISO CL PD
4
01 01 01 01
mAp-p % M F
Capacitive load
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
FS F SYNC VO TLOAD TTLOAD
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
ATR2815S
Units
Max 10 1000 25 25 ms mVpk ms ms
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 5 6 7 8 9 10 Parameter guaranteed by line and load regulation tests. Bandwidth guaranteed by design. Tested for 20KHz to 2.0MHz. 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. There after 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 2.0s and 10s. Recovery time is measured from the initiation of the transient to where VOUT has returned to within 1.0% of VOUT at 50% load. Input step transition time between 2.0s and 10s. 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.
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ATR28XXS Series
+Input 1
Block Diagram
EMI Filter 5 +Vout
Inhibit Input 2 Case 8 Sync 9
Primary Housekeeping Supply
4
Output Return
Drive
Pulse Width FB Modulator
CS
Error Amp & Ref
6 +Sense 3 Sense Return
Input Return 10
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 1.0VDC.
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),P d = 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:
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
1 1 - 1 = 30 - 1 = 9.5W P = Pout Eff 76
T = 80 (7.34)-0.7 (9.5)0.85 = 134C
Hence, if T AMBIENT = +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:
T AHEATSINK = 0. 85 80Pd
-1.43
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. International Rectifier 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.
- 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
Mechanical Outlines Flanged
O 0.162 2 Holes 0.050 0.800
Non-Flanged
0.040 D X 0.26 L Pins
10
1
9
2
2.880 Max
2.550
2.110 Max
4 X 0.400 =1.600
2.110
3
7
8
4 5
6
1.110
0.390 Max
0.390 Max
Pin Designation
Pin # 1 2 3 4 5 6 7 8 9 10 Designation + Input Inhibit Input Sense Return* Output Return + Output + Sense* NC Case Ground Sync. Input Return
* 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.
Standard Microcircuit Drawing Equivalence Table
Standard Microcircuit Drawing Number
5962-94624 5962-94625
Vendor Cage Code 52467 52467
IR Standard Part Number
ATR2805S ATR2812S
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ATR28XXS Series
Device Screening
Requirement
Temperature Range Element Evaluation Non-Destructive Bond Pull Internal Visual Temperature Cycle Constant Acceleration PIND Burn-In Final Electrical ( Group A ) PDA Seal, Fine and Gross Radiographic External Visual MIL-PRF-38534 2023 2017 1010 2001, Y1 Axis 2020 1015 MIL-PRF-38534 & Specification MIL-PRF-38534 1014 2012 2009 N/A Cond A N/A N/A Cond A, C N/A Yes N/A N/A N/A N/A 25C
MIL-STD-883 Method
No Suffix
N/A N/A
ES
N/A N/A Yes Cond B 500 Gs N/A 48 hrs@hi temp 25C
HB
N/A N/A Yes Cond C 3000 Gs N/A -55C, +25C, +125C N/A Cond A, C N/A Yes
CH
Class H N/A Yes Cond C 3000 Gs N/A -55C, +25C, +125C 10% Cond A, C N/A Yes
-20C to +85C -55C to +125C
-55C to +125C -55C to +125C
160 hrs@125C 160 hrs@125C
Notes:
Best commercial practice Sample tests at low and high temperatures -55C to +105C for AHE, ATO, ATW
Part Numbering ATR 28 15 S F /CH
Model Input Voltage Nominal
28 = 28V
Screening Level Package Style Output
(Please refer to Screening Table)
No Suffix, ES, HB, CH F = Flange Blank = Non-Flanged S = Single
Output Voltage
03R3 = 3.3V 05 = 5V 12 = 12V 15 = 15V
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. 01/2007
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