IRF ATS2803R3S

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
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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%
-55°C to +125°C Operating Temperature Range
100MΩ @ 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
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Military Aircraft
Commercial Aircraft
Missiles
Ground Equipment
1
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.
2
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
Recommended Operating Conditions
Input voltage range
-0.5Vdc to +75Vdc
Input voltage range
Output power
Internally limited
Lead temperature
Input voltage range
+300°C for 10 seconds Output power
Operating case temperature
-55°C to +125°C
Storage temperature
-55°C to +135°C
+16Vdc to +50Vdc
1
+16Vdc to +38Vdc
0 to Max. Rated
Operating temperature
2
-55°C to +125°C
Operating temperature
1
-55°C to +70°C
1
2
Meets derating per MIL-STD-975
For operation at +125°C see table note 13
Electrical Performance Characteristics
Parameter
Group A
Subgroup
Conditions
-55°C ≤ T C ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
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
Limits
Min
Nom
Max
Unit
16
28
50
V
3.27
4.95
11.88
14.85
±4.95
±11.88
±14.85
3.30
5.00
12.00
15.00
±5.00
±12.00
±15.00
3.33
5.05
12.12
15.15
±5.05
±12.12
±15.15
V
3.23
4.90
11.76
14.70
±4.90
±11.76
±14.70
3.37
5.10
12.24
15.30
±5.10
±12.24
±15.30
V
1
1
1
1
1
1
1
IOUT = 100% rated load
Note 4
2,3
2,3
2,3
2,3
2,3
2,3
2,3
IOUT = 100% rated load
Note 4
1,2,3
VIN = 16, 28, 50 Volts, Note 2
0
0
20
25
1,2,3
VIN = 16, 28, 50 Volts, Note 2
0
0
0
0
0
0
0
6.06
5.00
2.08
1.67
4.00
1.67
1.33
A
Either Output, Note 3
Either Output, Note 3
Either Output, Note 3
W
Line regulation ( VRLINE )
1,2,3
VIN = 16, 28, 50 Volts
IOUT = 0, 50%, 100% rated, Note 4
-0.5
0.5
%
Load regulation ( VRLOAD )
1,2,3
IOUT = 0, 50%, 100% rated, Note 4
VIN = 16, 28, 50 Volts
-1.0
1.0
%
1,2,3
VIN = 16, 28, 50 Volts
Duals only, Note 5
-5.0
-3.0
-3.0
5.0
3.0
3.0
%
Cross regulation ( VRCROSS )
ATS2805D
ATS2812D
ATS2815D
For Notes to Electrical Performance Characteristics Table, refer to page 5
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3
ATS-SERIES
Electrical Performance Characteristics
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
( continued )
Group A
Subgroup
Conditions
-55°C ≤ TC ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
1,2,3
IOUT = 0, Pin 4 open
Min
Nom
Max
Unit
60
70
70
70
70
100
100
mA
1,2,3
Pin 4 shorted to pin 2
8.0
mA
1,2,3
VIN = 16, 28, 50 Volts
IOUT = 100% rated load
Notes 4, 6
35
50
70
80
80
80
80
mV p-p
575
KHz
1,2,3
Sync. Input (Pin 4) open
425
500
1,2,3
IOUT = 100% rated load
Note 4
68
75
75
75
75
75
75
75
79
80
81
79
79
80
1,2,3
Note 1
Current Limit Point
Expressed as a percentage
of full rated load current
1,2,3
Vout = 90% of Nominal, Note 4
Power dissipation, load fault (PD)
1,2,3
Short Circuit, Overload, Note 8
Output response to
step load changes (VTLD)
4,5,6
Half Load to/from Full Load, Notes 4,9
Recovery time,
step load changes (TTLD)
4,5,6
Half Load to/from Full Load, Note
4,9,10
Output response to
step line changes (VTLN)
4,5,6
16V to/from 50V
IOUT = 100% rated load, Notes 1,4,11
Recovery Time,
step line changes (TTLN)
4,5,6
16V to/from 50V
IOUT = 100% rated load, Notes
1,4,10,11
4,5,6
No Load, Full Load
Notes 4,12
Turn-on Response
Overshoot (VOS)
Turn-on Delay (TDLY)
Limits
%
-0.5
11.5
500
50
V
µA
V
105
130
%
14
W
300
mV pk
200
µs
300
mV pk
200
µs
500
10
mV
ms
9.5
-300
-300
2.0
For Notes to Electrical Performance Characteristics Table, refer to page 5
4
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ATS-SERIES
Electrical Performance Characteristics
Parameter
Capacitive Load (CL)
ATS2803R3S
ATS2805S
ATS2812S
ATS2815S
ATS2805D
ATS2812D
ATS2815D
Group A
Subgroup
1
( continued )
Conditions
-55°C ≤ T C ≤ +85°C
VIN = 28V DC ± 5%, CL = 0
unless otherwise specified
Limits
Min
IOUT = 100% rated load
No effect on DC performance
Notes 1, 4, 7
Each output on duals
Line Rejection
1
IOUT = 100% rated load
DC to 50KHz, Notes 1, 4
40
Isolation
1
Input to Output or Any Pin to Case
except pin 3, test @ 500VDC
100
Device Weight
MTBF
Nom
Max
Unit
2200
1000
180
120
500
90
60
µF
50
dB
MΩ
85
MIL-HDBK-217F2, GM, 35°C
TBD
g
Hr
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 ≥ 10µs.
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 ≥ 100µs.
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 +85°C and +125°C, derate the maximum input voltage linearly from
100% to 75%.
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5
ATS-SERIES
Circuit for Measuring Output Ripple Voltage
50 Ω
50 Ω Coax
1 µF
Oscilloscope or equivalent
with 10 MHz bandwidth,
multiply readings by 2.
0.1 µF
+ Vout
50 Ω
Termination
DUT
Return
RL for IRATED
6
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ATS-SERIES
Figure 1. Conducted Emissions, Normal Mode
100
90
80
70
dB-uA
60
CEO3 LIMIT
50
40
30
20
10
0
1E3
1E4
1E5
1E6
1E7
1E8
1E7
1E8
Frequency ( Hz )
Figure 2. Conducted Emissions, Common Mode
100
90
80
70
dB-uA
60
CEO3 LIMIT
50
40
30
20
10
0
1E3
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1E4
1E5
Frequency ( Hz )
1E6
7
ATS-SERIES
Figure 3. Block Diagram - Single Output
Vin
1
INHIBIT
4
RETURN
2
CASE
GROUND
3
EMI
FILTER
+10.5V
7
+OUTPUT
6
OUTPUT
RETURN
5
OUTPUT
ADJUST
BIAS
SUPPLY
+
EA
-
RAMP
GEN.
PWM
CONTROLLER
SAMPLE
&
HOLD
FEEDBACK
TRIGGER
Figure 4. Block Diagram - Dual Output
Vin
1
EMI
FILTER
8
+OUTPUT
7
RETURN
6
-OUTPUT
5
OUTPUT
ADJUST
+10.5V
INHIBIT
4
RETURN
2
CASE
GROUND
3
BIAS
SUPPLY
+
EA
-
RAMP
GEN.
PWM
CONTROLLER
SAMPLE
&
HOLD
FEEDBACK
TRIGGER
8
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ATS-SERIES
Mechanical Outline
2.300
0.375
ø 0.128
4 Plcs
1.550
0.050
0.25 Typ.
0.270
8
0.470
1
0.400
7
0.400
1.000
Ref
1.500 1.750 2.000
3
6
4
5
2
2 Eq Spaces
@ 0.200
0.400
0.200
Pin ø
0.040
0.350
0.220
0.850
2.80
Ref
0.250
Tolerance: .XX = ±0.01
.XXX = ±0.005
0.425
Max
Pin Designation (Single/Dual)
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Pin #
Single
Dual
1
+ Input
+ Input
2
Input Return
Input Return
3
Case
Case
4
Inhibit
Inhibit
5
Output Adjust
Output Adjust
6
Output Return
- Vout
7
8
+ Vout
NC
Output Return
+ Vout
9
ATS-SERIES
Device Screening
Requirement
MIL-STD-883 Method
Temperature Range
Element Evaluation
Non-Destructive
Bond Pull
Internal Visual
No Suffix
ES
d
-20°C to +85°C -55°C to +125°C
HB
e -55°C to +125°C
CH
-55°C to +125°C
MIL-PRF-38534
N/A
N/A
N/A
Class H
2023
N/A
N/A
N/A
N/A
2017
c
Yes
Yes
Yes
Temperature Cycle
1010
N/A
Cond B
Cond C
Cond C
Constant Acceleration
2001, Y1 Axis
N/A
500 Gs
3000 Gs
3000 Gs
PIND
2020
N/A
N/A
N/A
N/A
48 hrs@hi temp
Burn-In
1015
N/A
Final Electrical
MIL-PRF-38534
25°C
25°C
d
160 hrs@125°C 160 hrs@125°C
-55°C, +25°C,
-55°C, +25°C,
( Group A )
& Specification
+125°C
+125°C
PDA
MIL-PRF-38534
N/A
N/A
N/A
10%
Seal, Fine and Gross
1014
Cond A
Cond A, C
Cond A, C
Cond A, C
Radiographic
2012
N/A
External Visual
2009
c
N/A
N/A
N/A
Yes
Yes
Yes
Notes:
 Best commercial practice
‚ Sample tests at low and high temperatures
ƒ -55°C to +105°C for AHE, ATO, ATW
Part Numbering
ATS 28 05 S /CH
Model
Input Voltage
28 = 28V
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)
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
10
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