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PD-97221A
ATS-SERIES
28V Input, Single/Dual Output
HIGH RELIABILITY DC/DC CONVERTER
Description
The ATS Series DC/DC converters are a family of 25W, single and dual output, high reliability devices designed for rugged environments and extended temperature operations such as those encountered in military, aerospace and industrial applications. The converters are in full compliant with CE03 and CS01 of MIL-STD461C. Features include small size, low weight and conservative component stress de-rating. For operations in radiation environments, the M3L series with the identical form factor and electrical rating is recommended. All models include an external inhibit port and have an adjustable output voltage. They are enclosed in a hermetic 1.5" x 2.3" x .425" steel package and weight less than 85grams. The package utilizes rugged ceramic feed-thru copper core pins and is sealed using parallel seam welding. 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.
ATS Features
n n n n n n n n n n n n n n n n 16V to 50V DC Input Range Input Transient per MIL-STD-704D Up to 25W Output Power Single and Dual Output Models Include 3.3V, 5V, 12V, 15V, 5V, 12V and 15V Internal EMI Filter; Converter Capable of Meeting MIL-STD-461C CE03 and CS01 Magnetically Coupled Feedback High Efficiency - to 82% -55C to +125C Operating Temperature Range 100M @ 500VDC Isolation Under-Voltage Lockout Short Circuit and Overload Protection Output Over Voltage Limiter Adjustable Output Voltage External Inhibit 1,500,000 Hour MTBF Low Weight, < 85 grams
Applications
n n n n Military Aircraft Commercial Aircraft Missiles Ground Equipment
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01/16/07
ATS-SERIES
Circuit Description
The ATS Series converters utilize a single-ended forward topology with resonant reset. The nominal switching frequency is 500KHz. Electrical isolation and tight output regulation are achieved through the use of a magnetically coupled feedback. Voltage feed-forward with duty factor limiting provides high line rejection and protection against output over voltage in the event of an internal control loop failure. This mechanism limits the maximum output voltage to approximately 20% over the nominal regardless of the line voltage. An internal EMI filter allows the converter to meet the conducted emissions requirements of MIL-STD461C on the input power leads. A single-stage output filter reduces the typical output ripple to less than 50mV peak-to-peak. Output current is limited under any load fault condition to approximately 125% of rated. An overload condition causes the converter output to behave like a constant current source with the output voltage dropping below nominal. The converter will resume normal operation when the load current is reduced below the current limit point. This protects the converter from both overload and short circuit conditions. The current limit point exhibits a slightly negative temperature coefficient to reduce the possibility of thermal runaway. An external inhibit port is provided to control converter operation. The converter's operation is inhibited when this pin is pulled low. It is designed to be driven by an open collector logic device. The pin may be left open for normal operation and has a nominal open circuit voltage of 10.5V with respect to the input return (pin 2). The output voltage of all models can be adjusted using a single external resistor.
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ATS-SERIES
Absolute Maximum Ratings
Input voltage range Output power Lead temperature Operating case temperature Storage temperature -0.5Vdc to +75Vdc Internally limited
Recommended Operating Conditions
Input voltage range
1
+16Vdc to +50Vdc +16Vdc to +38Vdc 0 to Max. Rated
2 1
Input voltage range +300C for 10 seconds Output power -55C to +125C -55C to +135C
Operating temperature Operating temperature
1
-55C to +125C -55C to +70C
2
Meets derating per MIL-STD-975 For operation at +125C see table note 13
Electrical Performance Characteristics
Group A Subgroup Conditions -55C T C +85C VIN = 28V DC 5%, CL = 0 unless otherwise specified Limits Min 16 1 1 1 1 1 1 1 2,3 2,3 2,3 2,3 2,3 2,3 2,3 1,2,3 IOUT = 100% rated load Note 4 3.27 4.95 11.88 14.85 4.95 11.88 14.85 3.23 4.90 11.76 14.70 4.90 11.76 14.70 0 0 0 0 0 0 0 0 0 -0.5 -1.0 Nom 28 3.30 5.00 12.00 15.00 5.00 12.00 15.00 Max 50 3.33 5.05 12.12 15.15 5.05 12.12 15.15 3.37 5.10 12.24 15.30 5.10 12.24 15.30 20 25 6.06 5.00 2.08 1.67 4.00 1.67 1.33 0.5 1.0 Unit V
Parameter Input Voltage Output Voltage ( Vout ) ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D Output power ( POUT ) ATS2803R3S All Others Output current ( IOUT ) ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D Line regulation ( VRLINE ) Load regulation ( VRLOAD ) Cross regulation ( VRCROSS ) ATS2805D ATS2812D ATS2815D
V
IOUT = 100% rated load Note 4
V
VIN = 16, 28, 50 Volts, Note 2
W
1,2,3
VIN = 16, 28, 50 Volts, Note 2
A
Either Output, Note 3 Either Output, Note 3 Either Output, Note 3 1,2,3 1,2,3 VIN = 16, 28, 50 Volts IOUT = 0, 50%, 100% rated, Note 4 IOUT = 0, 50%, 100% rated, Note 4 VIN = 16, 28, 50 Volts VIN = 16, 28, 50 Volts Duals only, Note 5
% %
1,2,3
-5.0 -3.0 -3.0
5.0 3.0 3.0
%
For Notes to Electrical Performance Characteristics Table, refer to page 5
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ATS-SERIES
Electrical Performance Characteristics
Group A Subgroup 1,2,3
( continued )
Limits Min Nom Max 60 70 70 70 70 100 100 8.0 35 50 70 80 80 80 80 425 68 75 75 75 75 75 75 9.5 -0.5 500 75 79 80 81 79 79 80 11.5 500 50 130 575 Unit
Parameter Input current, no load ( IIN ) ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D Input current inhibited Output ripple ( V RIP ) ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D Switching frequency ( FS ) Efficiency ( EFF ) ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D Enable Input ( Inhibit Function ) open circuit voltage drive current ( sink ) voltage range Current Limit Point Expressed as a percentage of full rated load current Power dissipation, load fault (PD) Output response to step load changes (VTLD) Recovery time, step load changes (TTLD) Output response to step line changes (VTLN) Recovery Time, step line changes (TTLN) Turn-on Response Overshoot (VOS) Turn-on Delay (TDLY)
Conditions -55C TC +85C VIN = 28V DC 5%, CL = 0 unless otherwise specified IOUT = 0, Pin 4 open
mA
1,2,3 1,2,3
Pin 4 shorted to pin 2 VIN = 16, 28, 50 Volts IOUT = 100% rated load Notes 4, 6
mA
mV p-p
1,2,3 1,2,3
Sync. Input (Pin 4) open IOUT = 100% rated load Note 4
KHz
%
1,2,3
Note 1
V A V %
1,2,3
Vout = 90% of Nominal, Note 4
105
1,2,3 4,5,6 4,5,6 4,5,6 4,5,6
Short Circuit, Overload, Note 8 Half Load to/from Full Load, Notes 4,9 Half Load to/from Full Load, Note 4,9,10 16V to/from 50V IOUT = 100% rated load, Notes 1,4,11 16V to/from 50V IOUT = 100% rated load, Notes 1,4,10,11 No Load, Full Load Notes 4,12 2.0 -300 -300
14 300 200 300 200
W mV pk s mV pk s
4,5,6
500 10
mV ms
For Notes to Electrical Performance Characteristics Table, refer to page 5
4
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ATS-SERIES
Electrical Performance Characteristics
Group A Subgroup 1
( continued )
Limits Min Nom Max 2200 1000 180 120 500 90 60 40 100 85 50 Unit
Parameter Capacitive Load (CL) ATS2803R3S ATS2805S ATS2812S ATS2815S ATS2805D ATS2812D ATS2815D Line Rejection Isolation Device Weight MTBF
Conditions -55C T C +85C VIN = 28V DC 5%, CL = 0 unless otherwise specified IOUT = 100% rated load No effect on DC performance Notes 1, 4, 7 Each output on duals
F
1 1
IOUT = 100% rated load DC to 50KHz, Notes 1, 4 Input to Output or Any Pin to Case except pin 3, test @ 500VDC
dB M g Hr
MIL-HDBK-217F2, GM, 35C
TBD
Notes for Electrical Performance Characteristics Table
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Parameter is tested as part of design characterization or after design changes. Thereafter, parameter shall be guaranteed to the limits specified. Parameter verified during line and load regulation tests. Output load current must be distributed such that at least 20% of the total load current is being provided by one of the outputs. Load current split equally between outputs on dual output models. Cross regulation is measured with 20% rated load on output under test while changing the load on the other output from 20% to 80% of rated. Guaranteed for a D.C. to 20MHz bandwidth. Tested using a 20KHz to 10MHz bandwidth using the circuit on page 6. 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 may interfere with the proper operation of the converter's overload protection, causing erratic behavior during turn-on. Overload power dissipation is defined as the device power dissipation with the load set such that V OUT = 90% of nominal. Load step transition time 10s. Recovery time is measured from the initiation of the transient to where VOUT has returned to within 1.0% of its steady state value. Line step transition time 100s. Turn-on delay time from either a step application of input power or a logic low to a logic high transition on the inhibit pin (pin 4) to the point where VOUT = 90% of nominal. For operation at temperatures between +85C and +125C, derate the maximum input voltage linearly from 100% to 75%.
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ATS-SERIES
Circuit for Measuring Output Ripple Voltage
50 50 Coax 1 F Oscilloscope or equivalent with 10 MHz bandwidth, multiply readings by 2. 50 Termination
0.1 F
+ Vout
DUT
Return
RL for IRATED
6
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ATS-SERIES
Figure 1. Conducted Emissions, Normal Mode
100 90 80 70 60 dB-uA CEO3 LIMIT 50 40 30 20 10 0 1E3 1E4 1E5 Frequency ( Hz ) 1E6 1E7 1E8
Figure 2. Conducted Emissions, Common Mode
100 90 80 70 60 dB-uA 50 40 30 20 10 0 1E3 1E4 1E5 Frequency ( Hz ) 1E6 1E7 1E8 CEO3 LIMIT
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ATS-SERIES
Figure 3. Block Diagram - Single Output
Vin 1 EMI FILTER 7 +OUTPUT
+10.5V INHIBIT 4 BIAS SUPPLY
6
OUTPUT RETURN
RETURN
2
CASE GROUND
3 EA
+ -
5
OUTPUT ADJUST
RAMP GEN.
PWM CONTROLLER
SAMPLE & HOLD FEEDBACK TRIGGER
Figure 4. Block Diagram - Dual Output
Vin 1 EMI FILTER 8 +OUTPUT
7
RETURN
+10.5V INHIBIT 4 BIAS SUPPLY 6 -OUTPUT
RETURN
2
CASE GROUND
3 EA
+ -
5
OUTPUT ADJUST
RAMP GEN.
PWM CONTROLLER
SAMPLE & HOLD FEEDBACK TRIGGER
8
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ATS-SERIES
Mechanical Outline
2.300 0.375 1.550 0.25 Typ. o 0.128 4 Plcs 0.050
8
0.470
0.270 0.400 1.500 1.750 2.000 1.000 Ref 7 0.400 0.200 Pin o 0.040 0.350 0.850 0.220
1
0.400
2
2 Eq Spaces @ 0.200
2.80 Ref 0.250 0.425 Max
5
6
3 4
Tolerance: .XX = 0.01 .XXX = 0.005
Pin Designation (Single/Dual)
Pin # 1 2 3 4 5 6 7 8 Single + Input Input Return Case Inhibit Output Adjust Output Return + Vout NC Dual + Input Input Return Case Inhibit Output Adjust - Vout Output Return + Vout
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ATS-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
MIL-STD-883 Method
No Suffix
N/A N/A
ES
d
HB
CH
-55C to +125C 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 N/A N/A Yes Cond B 500 Gs N/A
e -55C to +125C
N/A N/A Yes Cond C 3000 Gs N/A -55C, +25C, +125C N/A Cond A, C N/A Yes
c
N/A N/A N/A N/A 25C
48 hrs@hi temp 25C
d
160 hrs@125C 160 hrs@125C
c
Notes:
Best commercial practice Sample tests at low and high temperatures -55C to +105C for AHE, ATO, ATW
Part Numbering
ATS 28 05 S /CH Model Input Voltage Output Voltage
Single: 03R3 = 3.3V, 05 = 5V 12 = 12V, 15 = 15V Dual: 05 = 5V, 12 = 12V 15 = 15V
Screening Level
(Please refer to Screening Table)
28 = 28V
No Suffix, ES, HB, CH
Output
S = Single D = Dual
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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