PD - 94582
ATO28XXT SERIES
ADVANCED ANALOG
HYBRID-HIGH RELIABILITY
DC/DC CONVERTERS
Description
The ATO28XXT Series of DC/DC converters feature
high power density and an extended temperature range
for use in military and industrial applications. Designed
to the nominal input requirements of MIL-STD-704D,
these devices have nominal 28VDC inputs with +5V
and
±12V
or +5V and
±15V
triple outputs to satisfy a
wide range of requirements. The circuit design incor-
porates a pulse width modulated push-pull topology
operating in the feed-forward mode at a nominal switch-
ing frequency of 250KHz. Input to output isolation is
achieved through the use of transformers in the for-
ward and feedback circuits.
The advanced feedback design provides fast loop re-
sponse for superior line and load transient characteris-
tics and offers greater reliability and radiation toler-
ance than devices incorporating optical feedback cir-
cuits.
Three standard temperature grades are offered. Refer
to Part Number section. They are provided in a stan-
dard plug-in package for PC mounting or in a flanged
package for more severe environments.
These converters are manufactured in a facility fully
qualified to MIL-STD-1772. All processes used to manu-
facture these converters have been qualified to enable
Advanced Analog to deliver compliant devices. Two
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 re-
quirements but do not have class H element evalua-
tion as directed by MIL-PRF-39534. Both grades are
fully tested and operate over the full military tempera-
ture range without derating of output power. Variations
in electrical, mechanical and screening can be accom-
modated. Extensive computer simulation using com-
plex modeling enables modest design modifications to
be accommodated. Contact Advanced Analog with
specific requirements.
28V Input, Triple Output
ATO
Features
n
16 to 40 VDC Input Range (28VDC Nominal)
n
5V, ±12V or 5V, ±15V Outputs Available
n
Indefinite Short Circuit and Overload
Protection
n
15 Watts Output Power
n
Fast Loop Response for Superior Transient
Characteristics
n
Operating Temperature Range from -55°C to
+125°C Available
n
Popular Industry Standard Pin-out
n
Resistance Seam Welded Case for Superior
Long Term Hermeticity
n
Efficiencies up to 81%
n
Shutdown from External Signal
n
200,000 Hour MTBF at 85°C
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1
11/20/02
ATO28XXT Series
Specifications
T
CASE
= -55°C to +85°C, V
IN
= +28V
±
5% unless otherwise specified
ABSOLUTE MAXIMUM RATINGS
Input Voltage
-0.5V to 50V
Power Output
Internally limited, 17.5W typical
Soldering
300°C for 10 seconds
Operating
-55°C to +115°C case
Temperature Range
6
Storage
-65°C to +135°C
TEST
STATIC
CHARACTERISTICS
OUTPUT
Voltage
1
SYMBOL
Condition
-55°C
≤
T
C
≤
+85°C, V
IN
= 28 V
DC
±5%,
C
L
=0
unless otherwise specified
ATO2812T
Min
Max
ATO2815T
Min
Max
Units
V
OUT
I
OUT
= 0 (main)
I
OUT
= 0 (dual)
1
TC = 25°C
Over Temp
TC = 25°C
Over Temp
Current
1,2,3
I
OUT
V
RIP
P
OUT
Ripple Voltage
1,4
Power
1,2,3
V
IN
= 16, 28, and 40 VDC (main)
V
IN
= 16, 28, and 40 VDC (dual)
1
V
IN
= 16, 28, and 40 VDC (dual)
BW = DC to 2 MHz (main)
V
IN
= 16, 28, and 40 VDC
BW = DC to 2 MHz (dual))
V
IN
= 16, 28, and 40 VDC (main)
(+dual)
(-dual)
(total)
V
IN
= 16, 28, and 40 VDC
I
OUT
= 0, 1000, 2000mA (main)
V
IN
= 16, 28, and 40 VDC (dual)
I
OUT
= 0,
±84, ±167mA
(dual)
V
IN
= 16, 28, and 40 VDC
I
OUT
= 0, 1000, 2000mA (main)
V
IN
= 16, 28, and 40 VDC
I
OUT
= 0,
±84, ±167mA
(dual)
I
OUT
= 0, Inhibit (pin 8)
Tied to input return (pin 10)
I
OUT
= 0, inhibit (pin 2) = open
I
OUT
= 2000 mA (main)
I
OUT
=
±167mA
(dual)
BW = DC to 2MHz
I
OUT
= 2000mA (main)
I
OUT
=
±167mA
(dual)
Input to output or any pin to
case (except pin 7) at 500 VDC,
Overload
Short Circuit
I
OUT
= 2000mA (main)
I
OUT
=
±
167mA (dual)
4.95
4.90
±11.88
±
11.76
0.0
0.0
5.05
5.10
±12.12
±
12.24
2000
±208
80
40
4.95
4.90
±14.85
±
14.70
0.0
0.0
5.05
5.10
±15.15
±
15.30
2000
±167
80
40
V
V
V
V
mA
mA
mVp-p
mVp-p
W
W
W
W
10
2.5
2.5
15
25
TC = 25
°
C
Over Temp
10
2.5
2.5
15
25
±
35
±
75
50
±75
REGULATION
Line
1,3
VR
LINE
mV
mV
mV
mV
mV
Load
1,3
VR
LOAD
±
30
±
60
50
±60
INPUT
Current
Ripple Current
4
I
IN
I
RIP
15
40
50
15
40
50
mA
mA
mAp-p
EFFICIENCY
ISOLATION
Load Fault
Power Dissipation
3
Switching Frequency
Inhibit Open Circuit
Voltage
E
FF
ISO
P
D
F
S
V
OI
TC = 25°C
TC = 25°C
TC = 25°C
76
100
8
6
275
13
76
100
8
6
275
13
%
MΩ
W
W
KHz
V
225
9
225
9
Notes to Specifications
1.
2.
3.
4.
5.
6.
Tested at each output.
Parameter guaranteed by line and load regulation tests.
At least 20 percent of the total output power should be taken from the (+5V volt) main output.
Bandwidth guaranteed by design. Tested for 20KHz to 2MHz.
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.
Above 85°C case temperature, derate output power linearly to 0 at 115°C case.
2
www.irf.com
ATO28XXT Series
Specifications
T
CASE
= -55°C to +105°C, V
IN
= +28V
±
5% unless otherwise specified
ABSOLUTE MAXIMUM RATINGS
Input Voltage
-0.5V to 50V
Power Output
Internally limited, 17.5W typical
Soldering
300°C for 10 seconds
Operating
-55°C to +125°C case
Temperature Range
6
Storage
-65°C to +135°C
TEST
SYMBOL
Condition
-55°C
≤
T
C
≤
+105°C, V
IN
= 28 V
DC
±5%,
C
L
=0
unless otherwise specified
ATO2812T/ES
Min
STATIC
CHARACTERISTICS
OUTPUT
Voltage
1
Max
ATO2815T/ES
Min
Max
Units
V
OUT
I
OUT
= 0 (main)
I
OUT
= 0 (dual)
1
TC = 25°C
Over Temp
TC = 25°C
Over Temp
Current
1,2,3
Ripple Voltage
1,4
I
OUT
V
RIP
Power
1,2,3
P
OUT
V
IN
= 16, 28, and 40 VDC (main)
V
IN
= 16, 28, and 40 VDC (dual)
1
V
IN
= 16, 28, and 40 VDC
BW = DC to 2 MHz (main)
V
IN
= 16, 28, and 40 VDC
BW = DC to 2 MHz (dual))
V
IN
= 16, 28, and 40 VDC (main)
(+dual)
(-dual)
(total)
V
IN
= 16, 28, and 40 VDC
I
OUT
= 0, 1000, 2000mA (main)
V
IN
= 16, 28, and 40 VDC (dual)
I
OUT
= 0,
±84, ±167mA
(dual)
V
IN
= 16, 28, and 40 VDC
I
OUT
= 0, 1000, 2000mA (main)
V
IN
= 16, 28, and 40 VDC
I
OUT
= 0,
±84, ±167mA
(dual)
I
OUT
= 0, Inhibit (pin 8)
Tied to input return (pin 10)
I
OUT
= 0, inhibit (pin 2) = open
I
OUT
= 2000 mA (main)
I
OUT
=
±167mA
(dual)
BW = DC to 2MHz
I
OUT
= 2000mA (main)
I
OUT
=
±167mA
(dual)
TC =
±25°C
Input to output or any pin to
case (except pin 7) at 500 VDC,
TC = +25°C
Overload, TC = +25°C
5
Short Circuit, TC = +25°C
I
OUT
= 2000mA (main)
I
OUT
=
±167mA
(dual)
4.95
4.90
±
11.88
±11.76
0.0
0.0
5.05
5.10
±
12.12
±12.24
2000
±
208
80
40
4.95
4.90
±
14.85
±14.70
0.0
0.0
5.05
5.10
±
15.15
±15.30
2000
±
167
80
40
V
V
V
V
mA
mA
mVp-p
mVp-p
W
W
W
W
10
2.5
2.5
15
25
TC = 25°C
Over Temp
±30
±
60
50
±
60
10
2.5
2.5
15
25
±35
±
75
50
±
75
REGULATION
Line
1,3
VR
LINE
mV
mV
mV
mV
mV
Load
1,3
VR
LOAD
INPUT
Current
Ripple Current
4
I
IN
I
RIP
15
40
50
15
40
50
mA
mA
mAp-p
EFFICIENCY
E
FF
TC = 25
°
C
76
76
%
ISOLATION
ISO
TC = 25°C
100
100
MΩ
Load Fault
Power Dissipation
3
Switching Frequency
P
D
TC = 25°C
8
6
225
9
275
13
225
9
8
6
275
13
W
W
KHz
V
F
S
Inhibit Open Circuit
Voltage
V
OI
Notes to Specifications
1.
2.
3.
4.
5.
6.
Tested at each output.
Parameter guaranteed by line and load regulation tests.
At least 20 percent of the total output power should be taken from the (+5V volt) main output.
Bandwidth guaranteed by design. Tested for 20KHz to 2MHz.
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.
Above 105°C case temperature, derate output power linearly to 0 at 125°C case
www.irf.com
3
ATO28XXT Series
Specifications
T
CASE
= -55°C to +125°C, V
IN
= +28V
±
5% unless otherwise specified
ABSOLUTE MAXIMUM RATINGS
Input Voltage
-0.5V to 50V
Power Output
Internally limited, 17.5W typical
Soldering
300°C for 10 seconds
Operating
-55°C to +135°C case
Temperature Range
6
Storage
-65°C to +135°C
TEST
SYMBOL
Condition
-55°C
≤
T
C
≤+125°C,
V
IN
= 28 V
DC
±5%,
C
L
=0
unless otherwise specified
ATO2812T/HB
Min
STATIC
CHARACTERISTICS
OUTPUT
Voltage
1
Max
ATO2815T/HB
Min
Max
Units
V
OUT
I
OUT
= 0 (main)
I
OUT
= 0 (dual)
1
TC = 25°C
Over Temp
TC = 25°C
Over Temp
Current
1,2,3
Ripple Voltage
1,4
I
OUT
V
RIP
Power
1,2,3
P
OUT
V
IN
= 16, 28, and 40 VDC (main)
V
IN
= 16, 28, and 40 VDC (dual)
1
V
IN
= 16, 28, and 40 VDC
BW = DC to 2 MHz (main)
V
IN
= 16, 28, and 40 VDC
BW = DC to 2 MHz (dual))
V
IN
= 16, 28, and 40 VDC (main)
(+dual)
(-dual)
(total)
V
IN
= 16, 28, and 40 VDC
I
OUT
= 0, 1000, 2000mA (main)
V
IN
= 16, 28, and 40 VDC (dual)
I
OUT
= 0,
±84, ±167mA
(dual)
V
IN
= 16, 28, and 40 VDC
I
OUT
= 0, 1000, 2000mA (main)
V
IN
= 16, 28, and 40 VDC
I
OUT
= 0,
±
84,
±
167mA (dual)
I
OUT
= 0, Inhibit (pin 8)
Tied to input return (pin 10)
I
OUT
= 0, inhibit (pin 2) = open
I
OUT
= 2000 mA (main)
I
OUT
=
±167mA
(dual)
BW = DC to 2MHz
I
OUT
= 2000mA (main)
I
OUT
=
±167mA
(dual)
TC =
±
25
°
C
Input to output or any pin to
case (except pin 7) at 500 VDC,
TC = +25°C
Overload, TC = +25°C
5
Short Circuit, TC = +25°C
I
OUT
= 2000mA (main)
I
OUT
=
±
167mA (dual)
4.95
4.90
±
11.88
±11.76
0.0
0.0
5.05
5.10
±
12.12
±12.24
2000
±208
80
40
4.95
4.90
±
14.85
±14.70
0.0
0.0
5.05
5.10
±
15.15
±15.30
2000
±167
80
40
V
V
V
V
mA
mA
mVp-p
mVp-p
W
W
W
W
10
2.5
2.5
15
25
TC = 25°C
Over Temp
±30
±
60
50
±
60
10
2.5
2.5
15
25
±35
±
75
50
±
75
REGULATION
Line
1,3
VR
LINE
mV
mV
mV
mV
mV
Load
1,3
VR
LOAD
INPUT
Current
Ripple Current
4
I
IN
I
RIP
15
40
50
15
40
50
mA
mA
mAp-p
EFFICIENCY
E
FF
TC = 25°C
76
76
%
ISOLATION
ISO
TC = 25°C
100
100
MΩ
Load Fault
Power Dissipation
3
Switching Frequency
P
D
TC = 25°C
8
6
225
9
275
13
225
9
8
6
275
13
W
W
KHz
V
F
S
Inhibit Open Circuit
Voltage
V
OI
Notes to Specifications
1.
2.
3.
4.
5.
6.
Tested at each output.
Parameter guaranteed by line and load regulation tests.
At least 20 percent of the total output power should be taken from the (+5V volt) main output.
Bandwidth guaranteed by design. Tested for 20KHz to 2MHz.
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.
Above 125°C case temperature, derate output power linearly to 0 at 135°C case
4
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ATO28XXT Series
ATO28XXT Block Diagram
5 + V out
R e g u la to r
4 -V out
1
+ Input
EM I
F ilter
2 + 5V out
8
E nable
D riv e 1
3 R eturn
P ulse
W idth
D riv e 2
M odulator
FB
E rro r A m p
& R e fe ren ce
Input
R eturn
10
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