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PD - 94550
ATR28XXD SERIES ADVANCED ANALOG HYBRID-HIGH RELIABILITY DC/DC CONVERTERS
Description
The ATR28XXD 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 12V and 15V dual 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. They 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 and operate 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
28V Input, Dual Output
ATR Features
n 16 to 40 VDC Input Range (28 VDC Nominal) n 12V and 15V Outputs Available n Indefinite Short Circuit and Overload Protection 3 n 35 W/in Power Density n 30 Watt Output Power 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 High Efficiency n Shutdown from External Signal n Military Screening
limited temperature range option. Variations in electrical, mechanical and screening can be accommodated. Extensive computer simulation using complex modeling enables rapid design modification to be provided. Contact Advanced Analog with specific requirements.
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10/29/02
ATR28XXD Series Specifications
TCASE = -55C to +85C, VIN = +28V 5% unless otherwise specified
ABSOLUTE MAXIMUM RATINGS Input Voltage -0.5V to 50VDC Power Output Internally limited, 36W typical Soldering 300C for 10 seconds Recommended Operating -55C to +85C Temperature Range1 Maximum Operating -55C to +115C Storage -65C to +135C
Condition -55C TC +85C, VIN = 28 VDC 5%, CL=0, unless otherwise specified
ATR2812D Min Typ Max Min
ATR2815D Typ Max Units
PARAMETER STATIC CHARACTERISTICS OUTPUT Voltage 5 Current Ripple Accuracy 1 Power REGULATION Line Load 6 CROSS REGULATION INPUT Voltage Range Current Ripple Current EFFICIENCY ISOLATION CAPACITIVE LOAD Load Fault Power Dissipation Switching Frequency 7 SYNC Frequency Range DYNAMIC CHARACTERISTICS Step Load Changes Output Transient Recovery
2
VIN = 16 to 40 VDC IOUT = 0 to Full Load Full Load, 20KHz to 2MHz TCASE = 25C, Full Load
11.76 0.0 11.88 30
12.00 40 12.00
12.24 1.25 85 12.12
14.70 0.0 14.85 30
15.00 40 15.00
15.30 1.0 85 15.15
VDC ADC mV p-p VDC W mV mV % VDC mADC mADC mA p-p % M F W W KHz KHz
VIN = 16 to 40 VDC IOUT = 0 to Full Load VIN = 16, 28, and 40 VDC 16.0 No Load, pin 2 = open Inhibited, pin 2 tied to pin 10 Full Load Full Load TC = +25C Input to output @500 VDC No effect on performance TC = +25C (total for both outputs) Short Circuit Overload, TC = +25C IOUT = Full Load 28.0
75 120 5 40.0 75 18 50 16.0 28.0
75 150 5 40.0 75 18 50
25 82 100
25 82 100
100 9 14 600 700 100 250 25 500 3 180 -600 5 5 0 14 14 600 25 25
100 9 14 600 700 100 250 25 500 3 180 -600 5 5 0 14 14 600 25 25
500 500
500 500
50% Load to 100% Load No Load to 50% Load 50% Load to 100% Load No Load to 50% Load 50% Load to No Load Input step 16 to 40 VDC Input step 40 to 16 VDC Input step 16 to 40 VDC Input step 40 to 16 VDC VIN = 16 to 40 VDC IOUT = O and Full Load VIN = 16 to 40 VDC
mVpk mVpk s s ms mVpk mVpk ms ms mVpk ms ms
Step Line Changes Output Transient 2 Recovery TURN-ON Overshoot 3 Delay Load Fault Recovery
Notes to Specifications
1. 2. 3. 4. 5. 6. 7. Above +85C case temperature, derate output power linearly to 0 at +115C case. Recovery time is measured from the initiation of the input transient to where VOUT has returned to within 1% of VOUT at 50% load. Turn-on delay time measurement is for either an application of power at the input or a signal at the inhibit pin. Load current split equally between +VOUT and -VOUT. Up to 90% of Full Power is available from either output provided. The total power output does not exceed 30 watts. 3W load on output under test, 3W to 27W on other output. Sync. Input signal: VIL = -0.5V Min, VIN = 2.5V Min, 10% to 90% duty cycle, 0.8V Max 11.5V Max
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ATR28XXD Series Specifications
TCASE = -55C to +125C, VIN = +28V 5% unless otherwise specified
ABSOLUTE MAXIMUM RATINGS Input Voltage -0.5V to 50VDC Power Output Internally limited, 36W typical Soldering 300C for 10 seconds Temperature Range1 Recommended Operating Maximum Operating Storage
Condition -55C TC +125C, VIN = 28 VDC 5%, CL=0, unless otherwise specified
-55C to +125C -55C to +135C -65C to +135C
ATR2812D/ES Min Typ Max Min
ATR2815D/ES Typ Max Units
PARAMETER STATIC CHARACTERISTICS OUTPUT Voltage 5 Current Ripple Accuracy 1 Power REGULATION Line Load 6 CROSS REGULATION INPUT Voltage Range Current Ripple Current EFFICIENCY ISOLATION CAPACITIVE LOAD
VIN = 16 to 40 VDC IOUT = 0 to Full Load Full Load, 20KHz to 2MHz TCASE = 25C, Full Load VIN = 16 to 40 VDC IOUT = 0 to Full Load VIN = 16, 28, and 40 VDC
11.76 0.0 11.88 30
12.00 40 12.00
12.24 1.25 85 12.12
14.70 0.0 14.85 30
15.00 40 15.00
15.30 1.0 85 15.15
VDC ADC mV p-p VDC W mV mV % VDC mADC mADC mA p-p % M F
75 120 5 16.0 28.0 40.0 75 18 50 16.0 28.0
75 150 5 40.0 75 18 50
Load Fault Power Dissipation Switching Frequency 7 SYNC Frequency Range DYNAMIC CHARACTERISTICS Step Load Changes Output Transient Recovery
2
No Load, pin 2 = open Inhibited, pin 2 tied to pin 10 Full Load Full Load TC = +25C Input to output @500 VDC No effect on performance TC = +25C (total for both outputs) Short Circuit Overload, TC = +25C IOUT = Full Load
80 100
25 82
79 100 100
25 82
100
500 500 100 250 25 500 3 180 -600 5 5 0 14 14
9 14 600 700
500 500 100 250 25 500 3 180 -600 5 5
9 14 600 700
W W KHz KHz
50% Load to 100% Load No Load to 50% Load 50% Load to 100% Load No Load to 50% Load 50% Load to No Load Input step 16 to 40 VDC Input step 40 to 16 VDC Input step 16 to 40 VDC Input step 40 to 16 VDC VIN = 16 to 40 VDC IOUT = O to Full Load VIN = 16 to 40 VDC
mVpk mVpk s s ms mVpk mVpk ms ms 600 25 25 mVpk ms ms
Step Line Changes Output Transient 2 Recovery TURN-ON Overshoot 3 Delay Load Fault Recovery
600 25 25
0 14 14
Notes to Specifications
1. 2. 3. 4. 5. 6. 7. Above +125C case temperature, derate output power linearly to 0 at +135C case. Recovery time is measured from the initiation of the input transient to where VOUT has returned to within 1% of VOUT at 50% load. Turn-on delay time measurement is for either an application of power at the input or a signal at the inhibit pin. Load current split equally between +VOUT and -VOUT. Up to 90% of Full Power is available from either output provided. The total power output does not exceed 30 watts. 3W load on output under test, 3W to 27W on other output. Sync. Input signal: VIL = -0.5V Min, VIN = 2.5V Min, 10% to 90% duty cycle 0.8V Max, 11.5V Max
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ATR28XXD Series Specifications
TCASE = -55C to +125C, VIN = +28V 5% unless otherwise specified
ABSOLUTE MAXIMUM RATINGS Input Voltage -0.5V to 50VDC Power Output Internally limited, 36W typical Soldering 300C for 10 seconds Temperature Range1 Recommended Operating Maximum Operating Storage
-55C to +125C -55C to +135C -65C to +135C
PARAMETER STATIC CHARACTERISTICS OUTPUT Voltage 5 Current Ripple Accuracy 1 Power REGULATION 4 Line 4 Load 6 CROSS REGULATION INPUT Voltage Range Current Ripple Current EFFICIENCY ISOLATION CAPACITIVE LOAD Load Fault Power Dissipation Switching Frequency 7 SYNC Frequency Range DYNAMIC CHARACTERISTICS Step Load Changes 4 Output Transient Recovery
2
Condition -55C TC +125C, VIN = 28 VDC 5%, CL=0, unless otherwise specified
ATR2812D/HB Min Typ Max Min
ATR2815D/HB Typ Max Units
VIN = 16 to 40 VDC IOUT = 0 to Full Load Full Load, 20KHz to 2MHz TCASE = 25C, Full Load VIN = 16 to 40 VDC IOUT = 0 to Full Load VIN = 16, 28, and 40 VDC
11.76 0.0 11.88 30
12.00 40 12.00
12.24 1.25 85 12.12
14.70 0.0 14.85 30
15.00 40 15.00
15.30 1.0 85 15.15
VDC ADC mV p-p VDC W mV mV % VDC mADC mADC mA p-p % M F W W KHz KHz
75 120 5 16.0 28.0 40.0 75 18 50 16.0 28.0 18 25 82
75 150 5 40.0 75 18 50
No Load, pin 2 = open Inhibited, pin 2 tied to pin 10 Full Load Full Load TC = +25C Input to output @500 VDC No effect on performance TC = +25C (total for both outputs) Short Circuit Overload, TC = +25C IOUT = Full Load
80 100
25 82
79 100 100 9 14 600 700
100 9 14 600 700 100 250 25 500 3 180 -600 5 5 0 14 14 450 750 70 1500 5 1500 -1500 10 10 600 25 25
500 500 100 250 25 500 3 180 -600 5 5 0 14 14
500 500
50% Load to 100% Load No Load to 50% Load 50% Load to 100% Load No Load to 50% Load 50% Load to No Load Input step 16 to 40 VDC Input step 40 to 16 VDC Input step 16 to 40 VDC Input step 40 to 16 VDC VIN = 16 to 40 VDC IOUT = O to Full Load VIN = 16 to 40 VDC
450 760 70 1500 5 1200 -1500 10 10 600 25 25
mVpk mVpk s s ms mVpk mVpk ms ms mVpk ms ms
Step Line Changes Output Transient 2 Recovery TURN-ON Overshoot 3 Delay Load Fault Recovery
Notes to Specifications
1. 2. 3. 4. 5. 6. 7. Above +125C case temperature, derate output power linearly to 0 at +135C case. Recovery time is measured from the initiation of the input transient to where VOUT has returned to within 1% of VOUT at 50% load. Turn-on delay time measurement is for either an application of power at the input or a signal at the inhibit pin. Load current split equally between +VOUT and -VOUT. Up to 90% of Full Power is available from either output provided. The total power output does not exceed 30 watts. 3W load on output under test, 3W to 27W on other output. Sync. Input signal: VIL = -0.5V Min, VIN = 2.5V Min, 10% to 90% duty cycle 0.8V Max, 11.5V Max
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ATR28XXD Series Specifications
TCASE = -55C to +125C, VIN = +28V 5% unless otherwise specified
ABSOLUTE MAXIMUM RATINGS Input Voltage -0.5V to 50VDC Power Output Internally limited, 36W typical Soldering 300C for 10 seconds Temperature Range1 Recommended Operating Maximum Operating Storage
-55C to +125C -55C to +135C -65C to +135C
PARAMETER STATIC CHARACTERISTICS OUTPUT Voltage 5 Current Ripple Accuracy 1 Power REGULATION 4 Line 4 Load 6 CROSS REGULATION INPUT Voltage Range Current Ripple Current EFFICIENCY ISOLATION CAPACITIVE LOAD Load Fault Power Dissipation Switching Frequency 7 SYNC Frequency Range DYNAMIC CHARACTERISTICS Step Load Changes 4 Output Transient Recovery
2
Condition -55C TC +125C, VIN = 28 VDC 5%, CL=0, unless otherwise specified
ATR2812D/CH Min Typ Max Min
ATR2815D/CH Typ Max Units
VIN = 16 to 40 VDC IOUT = 0 to Full Load Full Load, 20KHz to 2MHz TCASE = 25C, Full Load VIN = 16 to 40 VDC IOUT = 0 to Full Load VIN = 16, 28, and 40 VDC
11.76 0.0 11.88 30
12.00 40 12.00
12.24 1.25 85 12.12
14.70 0.0 14.85 30
15.00 40 15.00
15.30 1.0 85 15.15
VDC ADC mV p-p VDC W mV mV % VDC mADC mADC mA p-p % M F W W KHz KHz
75 120 5 16.0 28.0 40.0 75 18 50 16.0 28.0 18 25 82
75 150 5 40.0 75 18 50
No Load, pin 2 = open Inhibited, pin 2 tied to pin 10 Full Load Full Load TC = +25C Input to output @500 VDC No effect on performance TC = +25C (total for both outputs) Short Circuit Overload, TC = +25C IOUT = Full Load
80 100
25 82
79 100 100 9 14 600 700
100 9 14 600 700 100 250 25 500 3 180 -600 5 5 0 14 14 450 750 70 1500 5 1500 -1500 10 10 600 25 25
500 500 100 250 25 500 3 180 -600 5 5 0 14 14
500 500
50% Load to 100% Load No Load to 50% Load 50% Load to 100% Load No Load to 50% Load 50% Load to No Load Input step 16 to 40 VDC Input step 40 to 16 VDC Input step 16 to 40 VDC Input step 40 to 16 VDC VIN = 16 to 40 VDC IOUT = 0 to Full Load VIN = 16 to 40 VDC
450 760 70 1500 5 1200 -1500 10 10 600 25 25
mVpk mVpk s s ms mVpk mVpk ms ms mVpk ms ms
Step Line Changes Output Transient 2 Recovery TURN-ON Overshoot 3 Delay Load Fault Recovery
Notes to Specifications
1. 2. 3. 4. 5. 6. 7. Above +125C case temperature, derate output power linearly to 0 at +135C case. Recovery time is measured from the initiation of the input transient to where VOUT has returned to within 1% of VOUT at 50% load. Turn-on delay time measurement is for either an application of power at the input or a signal at the inhibit pin. Load current split equally between +VOUT and -VOUT. Up to 90% of Full Power is available from either output provided. The total power output does not exceed 30 watts. 3W load on output under test, 3W to 27W on other output. Sync. Input signal: VIL = -0.5V Min, VIN = 2.5V Min, 10% to 90% duty cycle 0.8V Max, 11.5V Max
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ATR28XXD Series
ATR28XXD Block Diagram
1 + In pu t R eg u la to r P rim ary H ou se ke e pin g S u pp ly 4 R etu rn EMI F ilte r 3 +Vout
2 E n ab le 8 C ase 9 S yn c
5 -V o u t
D riv e
P u lse W id th FB M o d u la to r
CS
E rro r Am p & Ref
In p u t R etu rn 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 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:
= 80 A
-0.7
Pd
0.85
(C)
(1)
where A = the effective surface area in square inhes(including heat sink if used), Pd = power dissipation in watts. The total surface area of the ATR standard package is 7.34 square inches. If a worse case full load efficiency of 78% is assumed, then the case temperature rise can be calculated as follows:
1 1 Pd = POUT - 1 = 30 - 1 = 8.5W Eff 78 and = 80 (7.34) -0.7 (8.5) 0.85 = 122C
EMI Filter
An EMI filter (AFC461), available as an option, will reduce the input ripple current to levels below the limits imposed by MIL-STD-461B CEO3.
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 (beat frequency noise). 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 (communications, radar or telemetry). The Advanced Analog ATR28xx converters provide a synchronizing input permitting synchronization of multiple converters to the frequency of the users system clock, thereby minimizing this type of noise.
Hence, if TAMBIENT = +25C, the DC/DC converter case temperature will be approximately 147C if no heat sink or air flow is provided. To calculate the heat sink area required to maintain a specific case temperature rise, equation (1) may be manipulated as follows:
T AHEATSINK = 0.85 80Pd
-1.43
- APKG
As an example, if it is desired to limit the case temperature rise to a maximum of 50C above ambient, the required effective heat sink area is:
50 AHEATSINK = 80(8.5)0.85
-1.43
- 7.34 = 19.1in 2
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ATR28XXD Series
ATR28XXD 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 Inhibit Input
Model Input Voltage
Part Numbering
ATR 28 15 S F / CH
Screening
-,
ES, HB, CH
28 = 28V Nominal
Package Style Outputs
S = Single D = Dual T = Triple
F = Flange Omit for Non-flange
Output Voltage
Positive Output Output Return Negative Output N/C N/C Case Sync. Input Return
Single - 05, 12, 15VDC Dual - 12 = 12V, 15 = 15V Triple - 12 = 5V, 12V 15 = 5V, 15V
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ATR28XXD Series
Available Screening Levels and Process Variations for ATR28XXD 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
Standardized Military Drawing Pin 5962-9462701 5962-9462801 Vendor CAGE Code 52467 52467 Vendor Similar Pin ATR2812D ATR2815D
WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331 ADVANCED ANALOG: 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. 10/02
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