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 -55°C to
+125°C
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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1
04/01/04
ATR28XXS Series
Specifications
ABSOLUTE MAXIMUM RATINGS
Input Voltage
-0.5V to 50V
Soldering Temperature
300°C for 10 seconds
Case Temperature
Operating -55°C to +125°C
Storage -65°C to +135°C
ATR2803R3S
Table I. Electrical performance Characteristics
Test
Symbol
Conditions
-55°C
≤
TC
≤
+125°C
V
IN
= 28VDC
±5%,
C
L
= 0
Unless otherwise specified
I
OUT
= 0
V
IN
= 16, 28, and 40 VDC
V
IN
= 16, 28, and 40 VDC
B.W. = 20Hz to 2 MHz
V
IN
= 16, 28, and 40 VDC
I
OUT
= 0, 3000, and 6000mA
V
IN
= 16,28, and 40 VDC
I
OUT
= 0, 3000, and 6000mA
I
OUT
= 0, inhibit (pin 2)
Tied to input return (pin 10)
I
OUT
= 0, inhibit (pin 2) = open
I
OUT
=6000mA
B.W. = 20Hz to 2 MHz
I
OUT
=6000mA
Input to output or any pin
to case (except pin 8) at
500 VDC, TC =+25°C
No effect on dc performance
TC =+25°C
6
Overload, TC = +25°C
Short Circuit
I
OUT
= 7500mA
I
OUT
= 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%
VO
TLINE
Input step 16V to/from
40VDC, I
OUT
= 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
%
MΩ
µF
W
KHz
KHz
mV pk
Units
Output voltage
Output current
Output ripple voltage
Line regulation
3
1
2
V
OUT
I
OUT
V
RIP
VR
LINE
VR
LOAD
I
IN
2
Load regulation
Input current
3
Input ripple current
Efficiency
Isolation
Capacitive load
I
RIP
E
FF
ISO
4, 5
C
L
P
D
F
S
F
SYNC
VO
TLOAD
TT
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
Output response to transient
5, 9
step line changes
01
01
µs
mV pk
For Notes to Specifications, refer to page 3
2
www.irf.com
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
-55°C
≤
TC
≤
+125°C
V
IN
= 28VDC
±5%,
C
L
= 0
Unless otherwise specified
Input step 16V to/from
40VDC, I
OUT
= 7500mA
I
OUT
= 10% to 100% of Load
I
OUT
=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
TT
LINE
VTon
OS
Ton
D
Tr
LF
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 V
OUT
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.
www.irf.com
3
ATR28XXS Series
Specifications
ABSOLUTE MAXIMUM RATINGS
Input Voltage
-0.5V to 50V
Soldering Temperature
300°C for 10 seconds
Case Temperature
Operating -55°C to +125°C
Storage -65°C to +135°C
ATR2805S
Table II. Electrical performance Characteristics
Test
Symbol
Conditions
-55°C
≤
TC
≤
+125°C
V
IN
= 28VDC
±5%,
C
L
= 0
Unless otherwise specified
I
OUT
= 0
V
IN
= 16, 28, and 40 VDC
V
IN
= 16, 28, and 40 VDC
B.W. = 20Hz to 2 MHz
V
IN
= 16, 28, and 40 VDC
I
OUT
= 0, 3000, and 6000mA
V
IN
= 16,28, and 40 VDC
I
OUT
= 0, 3000, and 6000mA
I
OUT
= 0, inhibit (pin 2)
Tied to input return (pin 10)
I
OUT
= 0, inhibit (pin 2) = open
I
OUT
=6000mA
B.W. = 20Hz to 2 MHz
I
OUT
=6000mA
Input to output or any pin
to case (except pin 8) at
500 VDC, TC =+25°C
No effect on dc performance
TC =+25°C
6
Overload, TC = +25°C
Short Circuit
I
OUT
= 6000mA
I
OUT
= 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
VO
TLINE
Input step 16V to/from
40VDC, I
OUT
= 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
V
OUT
I
OUT
V
RIP
VR
LINE
3
Load regulation
Input current
VR
LOAD
I
IN
2
01
01
mV
mA
Input ripple current
Efficiency
Isolation
4, 5
I
RIP
E
FF
ISO
1,2,3
1
2,3
1
01
01
01
mA p-p
%
MΩ
µF
W
Capacitive load
C
L
P
D
F
S
F
SYNC
VO
TLOAD
TT
LOAD
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
µs
01
mV pk
For Notes to Specifications, refer to page 5
4
www.irf.com
ATR28XXS Series
Table II. Electrical performance Characteristics -
continued
Test
Symbol
Conditions
-55°C
≤
TC
≤
+125°C
V
IN
= 28VDC
±5%,
C
L
= 0
Unless otherwise specified
Input step 16V to/from
40VDC, I
OUT
= 6000mA
I
OUT
=0 and 6000mA
I
OUT
=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
TT
LINE
VTon
OS
Ton
D
Tr
LF
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 V
OUT
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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5
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