PD - 94582A
ATO28XXT SERIES
28V Input, Triple Output
HYBRID-HIGH RELIABILITY
DC/DC CONVERTER
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
incorporates a pulse width modulated push-pull
topology operating in the feed-forward mode at a
nominal switching frequency of 250KHz. 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. Refer
to Part Numbering section. They are provided in a
standard plug-in package for PC mounting or in a
flanged package for more severe environments.
Manufactured in a facility fully qualified to MIL-PRF-
38534, these converters are fabricated utilizing DSCC
qualified processes. For available screening options,
refer to device screening table in the data sheet.
Variations in electrical, mechanical and screening can
be accommodated. Extensive computer simulation
using complex modeling enables modest design
modifications to be accommodated. Contact IR Santa
Clara with specific requirements.
ATO
Features
16V to 40VDC Input Range (28VDC Nominal)
5V, ±12V or 5V, ±15V Outputs Available
Indefinite Short Circuit and Overload Protection
15W Output Power
Fast Loop Response for Superior Transient
Characteristics
Operating Temperature Range from -55°C to
+125°C Available
Popular Industry Standard Pin-out
Resistance Seam Welded Case for Superior
Long Term Hermeticity
Efficiencies up to 81%
Shutdown from External Signal
200,000 Hour MTBF at 85°C
Standard Microcircuit Drawings Available
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1
01/12/07
ATO28XXT Series
Specifications
T
CASE
= -55°C to +85°C, V
IN
= +28V
±
5% unless otherwise specified
Absolute Maximum Ratings
Input voltage
Power Output
Soldering temperature
Temperature Range
6
-0.5V to +50VDC
Internally limited, 17.5W typical
300°C for 10 seconds
Operating case temperature
Storage case temperature
Condition
-55°C
≤
T
C
≤
+85°C, V
IN
= 28 V
DC
±5%,
C
L
=0
unless otherwise specified
-55°C to +115°C
-65°C to +135°C
TEST
STATIC
CHARACTERISTICS
OUTPUT
1
Voltage
SYMBOL
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
1,4
Ripple Voltage
Power
1,2,3
V
RIP
P
OUT
V
IN
= 16, 28, and 40 VDC (main)
1
V
IN
= 16, 28, and 40 VDC (dual)
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
15
40
50
76
100
8.0
6.0
275
13
8.0
6.0
275
13
REGULATION
Line
1,3
VR
LINE
Load
1,3
VR
LOAD
±30
±60
50
±60
15
40
50
76
100
mV
INPUT
Current
Ripple Current
4
I
IN
I
RIP
mA
mA
mAp-p
%
MΩ
W
KHz
V
EFFICIENCY
ISOLATION
Load Fault
3
Power Dissipation
Switching Frequency
Inhibit Open Circuit
Voltage
E
FF
ISO
P
D
F
S
V
OI
TC = 25°C
TC = 25°C
TC = 25°C
225
9.0
225
9.0
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) main output.
Bandwidth guaranteed by design. Tested for 20KHz to 2.0MHz.
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
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ATO28XXT Series
Specifications
T
CASE
= -55°C to +105°C, V
IN
= +28V
±
5% unless otherwise specified
A bso lu te M axim u m R ating s
In pu t vo ltag e
P ow er O utp ut
S old erin g te m p era ture
T em pe ratu re R an ge
6
-0.5 V to +5 0V D C
Inte rna lly lim ited , 17 .5W typ ica l
30 0°C for 1 0 secon ds
O p era ting ca se tem pe ratu re
Sto rag e case te m p era ture
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
-55 °C to +1 25 °C
-65 °C to +1 35 °C
ATO2815T/ES
Min
Max
Units
TEST
SYMBOL
V
OUT
I
OUT
= 0 (main)
I
OUT
= 0 (dual)
1
Current
1,2,3
Ripple Voltage
1,4
TC = 25°C
Over Temp
TC = 25°C
Over Temp
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
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
15
40
50
76
10
2.5
2.5
15
25
±35
±75
50
±75
15
40
50
76
REGULATION
Line
1,3
VR
LINE
Load
1,3
mV
VR
LOAD
INPUT
Current
Ripple Current
4
EFFICIENCY
I
IN
I
RIP
E
FF
ISO
P
D
F
S
mA
mA
mAp-p
%
TC = 25°C
ISOLATION
Load Fault
Power Dissipation
3
Switching Frequency
TC = 25°C
TC = 25°C
100
8.0
6.0
225
9.0
275
13
100
8.0
6.0
225
9.0
275
13
MΩ
W
KHz
V
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) main output.
Bandwidth guaranteed by design. Tested for 20KHz to 2.0MHz.
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
A bso lu te M axim u m R ating s
In pu t vo ltag e
P ow er O utp ut
S old erin g te m p era ture
T em pe ratu re R an ge
6
-0.5 V to +5 0V D C
Inte rna lly lim ited , 17 .5W typ ica l
30 0°C for 1 0 secon ds
O p era ting ca se tem pe ratu re
Sto rag e case te m p era ture
Condition
-55°C
≤
T
C
≤+125°C,
V
IN
= 28 V
DC
±5%,
C
L
=0
unless otherwise specified
-55 °C to +1 35 °C
-65 °C to +1 35 °C
TEST
SYMBOL
ATO2812T/HB
Min
Max
ATO2815T/HB
Min
Max
Units
STATIC
CHARACTERISTICS
OUTPUT
1
Voltage
V
OUT
I
OUT
= 0 (main)
I
OUT
= 0 (dual)
1
Current
1,2,3
1,4
TC = 25°C
Over Temp
TC = 25°C
Over Temp
I
OUT
V
RIP
Ripple Voltage
Power
1,2,3
P
OUT
V
IN
= 16, 28, and 40 VDC (main)
1
V
IN
= 16, 28, and 40 VDC (dual)
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
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
15
40
50
10
2.5
2.5
15
25
±35
±75
50
±75
15
40
50
REGULATION
1,3
Line
VR
LINE
Load
1,3
mV
VR
LOAD
INPUT
Current
Ripple Current
4
I
IN
I
RIP
E
FF
mA
mA
mAp-p
EFFICIENCY
TC = 25°C
76
76
%
ISOLATION
Load Fault
Power Dissipation
3
ISO
P
D
TC = 25°C
TC = 25°C
100
8.0
6.0
225
9.0
275
13
100
8.0
6.0
225
9.0
275
13
MΩ
W
Switching Frequency
F
S
Inhibit Open Circuit
Voltage
V
OI
KHz
V
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) main output.
Bandwidth guaranteed by design. Tested for 20KHz to 2.0MHz.
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
Block Diagram
5 + Dual Vout
Regulator
1
+Input
8
Enable
Input
Input
Return
10
EMI
Filter
4 - Dual Vout
2 +5V out
3 Output Return
Drive 1
Pulse
Width
Drive 2
Modulator
FB
Error Amp
& Reference
Standard Microcircuit Drawing Equivalence Table
Standard Microcircuit
Drawing Number
5962-90954
5962-91602
Vendor Cage
Code
52467
52467
IR Standard
Part Number
ATO2815T
ATO2812T
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